Avian Influenza H5 and H7 strains have long posed a threat to poultry farms worldwide. Recent shifts in how these viruses spread have raised concerns among farmers, veterinarians, and public health officials. Understanding these new transmission patterns is essential for managing risks at the farm level and protecting both animal and human health. How Avian Influenza H5/H7 Spreads Traditionally, avian influenza viruses spread through direct contact between infected and healthy birds, contaminated equipment, and farm workers. Migratory wild birds often act as carriers, introducing the virus to domestic flocks. However, recent outbreaks have revealed new ways the virus can move, increasing the challenge of controlling its spread. Airborne Transmission and Environmental Persistence Studies now show that H5 and H7 viruses can survive longer in the environment than previously thought. This means virus particles can linger in dust, water, and soil around farms. Airborne transmission through dust particles or aerosols has become a more significant factor, especially in densely populated poultry houses. This change means farms near infected sites face risks even without direct contact between birds. Wind can carry virus particles over short distances, contaminating neighboring farms or wild bird habitats. Role of Small Mammals and Insects Recent research has identified small mammals such as rodents and insects as potential mechanical carriers of the virus. These animals can move between infected and uninfected areas, carrying virus particles on their bodies or in droppings. This adds complexity to biosecurity measures, as controlling these vectors requires more than just managing bird populations. Farm-Level Risk Factors Understanding how these new transmission routes affect farm risk helps farmers prioritize prevention strategies. Several factors increase the likelihood of an outbreak on a farm: Farm Density Farms located close to others, especially in regions with many poultry operations, face higher risk due to easier virus spread through air and animal vectors. Biosecurity Practices Farms with weak biosecurity measures, such as poor sanitation, unrestricted visitor access, or inadequate pest control, are more vulnerable. Type of Poultry Housing Open or free-range systems expose birds to wild birds and environmental contamination more than fully enclosed houses. Water Sources Shared or untreated water sources can harbor the virus, especially if contaminated by wild birds. Case Example: Outbreak in a Mixed Housing Region In a recent outbreak in Southeast Asia, farms with mixed housing types—both enclosed and free-range—experienced rapid virus spread. The virus moved from free-range flocks exposed to wild birds to enclosed flocks through contaminated equipment and airborne particles. Farms that implemented strict biosecurity and pest control limited losses, while others suffered severe outbreaks. Practical Steps to Reduce Farm-Level Risk Farmers can take several actions to reduce the risk of infection and limit the impact of avian influenza: Enhance Biosecurity Limit farm access, disinfect equipment and vehicles regularly, and ensure workers follow hygiene protocols. Control Pests and Rodents Implement pest control programs to reduce the presence of small mammals and insects that may carry the virus. Manage Water Sources Use treated or closed water systems to prevent contamination from wild birds. Improve Housing Design Consider fully enclosed housing with filtered ventilation to reduce airborne virus entry. Monitor and Report Regularly check flocks for signs of illness and report suspicious cases to veterinary authorities promptly. The Importance of Early Detection and Response Early detection of avian influenza is critical to controlling outbreaks. Farms should establish routine health monitoring and work closely with veterinarians. Rapid response plans, including quarantine and culling protocols, help contain the virus before it spreads widely. Government agencies also play a role by providing surveillance data and supporting farmers with resources and guidance. Collaboration between farms, local authorities, and wildlife experts improves understanding of virus movement and helps develop targeted control measures. Looking Ahead: Adapting to Changing Risks The evolving transmission patterns of H5 and H7 avian influenza require ongoing vigilance. Farms must adapt their practices to address new challenges, including environmental persistence and vector control. Investing in biosecurity, infrastructure, and education will strengthen resilience against future outbreaks. Farmers should stay informed about the latest research and government recommendations. Sharing experiences and strategies within farming communities also supports collective risk reduction. Understanding how avian influenza H5 and H7 viruses spread in new ways helps farmers protect their flocks and livelihoods. By focusing on biosecurity, pest control, and early detection, farms can reduce the risk of infection and respond effectively when outbreaks occur. Staying proactive and informed is the best defense against this persistent threat.

Newcastle Disease (ND) remains a significant threat to poultry health worldwide. Recently, Europe has seen a rise in cases caused by Genotype VII of the Newcastle Disease Virus (NDV). This development challenges veterinary professionals to update their knowledge and strategies to manage outbreaks effectively. This article provides a clear overview of Genotype VII Newcastle Disease, its impact in Europe, and practical guidance for veterinarians working in the field. Signs of Newcastle Disease in poultry, close-up view of a chicken coop with affected birds What Is Genotype VII Newcastle Disease? Newcastle Disease Virus has multiple genotypes, but Genotype VII has gained attention due to its increased virulence and spread. This genotype belongs to the class II NDV strains and is known for causing severe outbreaks with high mortality rates in poultry. Genotype VII characteristics - High pathogenicity - Rapid spread among birds - Resistance to some traditional vaccines Genotype VII differs genetically from earlier strains, which affects how the virus behaves and how it responds to control measures. This genotype has caused significant outbreaks in Asia and Africa and is now increasingly reported in Europe. Why Is Genotype VII a Concern in Europe? Europe has traditionally controlled Newcastle Disease effectively through vaccination and biosecurity. However, the rise of Genotype VII presents new challenges: Increased outbreaks: Several European countries have reported outbreaks linked to Genotype VII, affecting commercial and backyard flocks. Economic impact: Losses from mortality, decreased production, and trade restrictions can be severe. Vaccine effectiveness: Some vaccines used in Europe may not fully protect against this genotype, leading to breakthrough infections. Veterinarians must recognize the signs of Genotype VII infection and understand its epidemiology to prevent widespread transmission. Recognizing Clinical Signs of Genotype VII Newcastle Disease Clinical signs of Newcastle Disease can vary but Genotype VII often causes more severe symptoms. Key signs to watch for include: Sudden death in birds without prior symptoms Respiratory distress: coughing, gasping, nasal discharge Nervous system signs: tremors, paralysis, twisted neck Drop in egg production and poor egg quality Swelling around the eyes and neck Early detection is critical. Vets should consider ND in differential diagnosis when these signs appear, especially in areas with recent outbreaks. Diagnostic Approaches for Genotype VII NDV Accurate diagnosis helps confirm the presence of Genotype VII and guides control measures. Recommended diagnostic steps include: Sample collection: Swabs from the trachea, cloaca, or tissues from dead birds Laboratory testing: - RT-PCR to detect viral RNA and identify genotype - Virus isolation and sequencing for confirmation - Serological tests to assess antibody levels Rapid and precise diagnosis allows timely response to outbreaks and helps track the spread of Genotype VII. Vaccination Strategies and Challenges Vaccination remains the cornerstone of Newcastle Disease control. However, Genotype VII requires careful vaccine selection and administration: Vaccine types: Live attenuated and inactivated vaccines are available, but not all provide full protection against Genotype VII. Vaccine matching: Using vaccines based on local circulating strains improves effectiveness. Some European labs are developing Genotype VII-specific vaccines. Vaccination protocols: Proper timing, dosage, and booster shots are essential to maintain immunity. Veterinarians should work with poultry producers to review vaccination programs and adjust them according to the latest evidence. Veterinary professional conducting health check on poultry, eye-level view in a farm environment Biosecurity Measures to Prevent Spread Alongside vaccination, strict biosecurity is vital to control Genotype VII outbreaks: Limit access: Restrict entry to poultry houses and control visitor movement. Disinfection: Regular cleaning and disinfection of equipment, vehicles, and footwear. Quarantine: Isolate new or sick birds to prevent transmission. Wild bird control: Minimize contact between wild birds and poultry, as wild birds can carry NDV. Educating farm workers on hygiene and disease signs supports early detection and containment. Case Study: Managing a Genotype VII Outbreak in Southern Europe In 2023, a commercial poultry farm in Southern Europe experienced a sudden outbreak of Newcastle Disease. The farm reported: Mortality rates exceeding 50% within a week Respiratory and neurological symptoms in affected birds Rapid spread to neighboring farms Veterinary teams responded by: Collecting samples for RT-PCR, confirming Genotype VII NDV Implementing emergency vaccination with a Genotype VII-adapted vaccine Enforcing strict biosecurity and movement controls Conducting follow-up surveillance to monitor virus clearance This coordinated response helped contain the outbreak within six weeks, minimizing further losses. What Veterinary Professionals Should Do Now Veterinarians in Europe must stay vigilant and prepared to face Genotype VII Newcastle Disease. Recommended actions include: Update knowledge on Genotype VII epidemiology and clinical signs Promote early diagnosis through appropriate sampling and testing Review and adapt vaccination programs to include Genotype VII coverage Strengthen biosecurity advice and farm education efforts Report suspected cases promptly to authorities for rapid response By taking these steps, vets can protect poultry health and support the European poultry industry. Genotype VII Newcastle Disease is a growing challenge in Europe that demands attention from veterinary professionals. Understanding its characteristics, recognizing clinical signs, and applying effective vaccination and biosecurity measures are essential to control its spread. Staying informed and proactive will help vets safeguard poultry populations and reduce the impact of this serious disease.

Newcastle Disease Virus (NDV) remains a significant threat to poultry farms worldwide, including those across Europe. Among the various NDV strains, Genotype VII has gained attention due to its distinct characteristics affecting virulence, shedding patterns, and vaccine effectiveness. European farmers and veterinarians need clear insights into how Genotype VII compares with other NDV strains to protect flock health and optimize vaccination programs. European poultry farm with healthy chickens in open barn What Makes Genotype VII Different from Other NDV Strains? NDV strains are classified into multiple genotypes based on genetic differences. Genotype VII stands out because it has caused several outbreaks with high mortality rates in Asia, Africa, and recently in Europe. Understanding its unique features helps farms prepare better. Virulence: Genotype VII strains are typically more virulent than many other NDV genotypes. They cause severe respiratory and neurological symptoms, leading to rapid spread and high death rates in unvaccinated flocks. Genetic Variability: This genotype shows considerable genetic diversity, which can influence how it interacts with the host immune system and vaccines. Geographical Spread: While originally more common in Asia, Genotype VII has increasingly been detected in European countries, raising concerns about its impact on local poultry industries. Virulence Comparison: Genotype VII vs. Other NDV Strains Virulence refers to the severity of disease caused by a virus. Genotype VII NDV strains are classified as velogenic, meaning they cause highly severe disease. In contrast, other genotypes like Genotype I or II often include lentogenic strains, which cause mild or no symptoms. Clinical Signs: Genotype VII infections often lead to severe respiratory distress, nervous system disorders such as tremors and paralysis, and sudden death. Mortality Rates: Outbreaks involving Genotype VII have reported mortality rates exceeding 70% in unvaccinated flocks, compared to 10-30% for less virulent strains. Economic Impact: The high virulence results in significant production losses, increased culling, and trade restrictions. For example, a 2018 outbreak in Eastern Europe involving Genotype VII led to the loss of thousands of birds within weeks, despite vaccination efforts using older vaccine strains. Shedding Patterns and Transmission Risks Shedding patterns describe how and when infected birds release the virus into the environment, influencing how quickly NDV spreads within and between farms. Genotype VII Shedding: Birds infected with Genotype VII shed large amounts of virus through respiratory secretions and feces, often starting 24-48 hours after infection. Duration: Shedding can continue for up to two weeks, increasing the risk of transmission to other birds and farms. Environmental Stability: The virus remains infectious in organic material like litter and manure, making biosecurity critical. By contrast, some less virulent NDV strains shed lower viral loads and for shorter periods, reducing transmission risk. Understanding these shedding dynamics helps farms implement timely quarantine and sanitation measures to contain outbreaks. Vaccine Compatibility and Challenges with Genotype VII Vaccination remains the primary tool for controlling NDV. However, Genotype VII presents challenges due to its genetic differences from traditional vaccine strains. Current Vaccines: Most vaccines used in Europe are based on Genotype II strains, such as LaSota or B1. These vaccines provide good protection against many NDV types but may offer reduced immunity against Genotype VII. Cross-Protection: Studies show that while existing vaccines reduce mortality and clinical signs from Genotype VII, they may not fully prevent virus shedding or transmission. Vaccine Breakthroughs: Farms relying solely on traditional vaccines have reported outbreaks with Genotype VII, indicating partial vaccine failure. New Vaccine Development: Researchers are working on vaccines specifically targeting Genotype VII to improve protection and reduce viral shedding. Farmers should consult veterinarians to evaluate vaccine programs and consider booster doses or updated vaccines where available. Poultry vaccination process showing syringe and chicken Practical Steps for European Farms Facing Genotype VII European poultry farms can take several practical steps to manage the risks posed by Genotype VII NDV strains: Enhanced Surveillance: Regular testing for NDV genotypes helps detect Genotype VII early and respond quickly. Review Vaccination Protocols: Work with veterinarians to assess if current vaccines are adequate or if Genotype VII-specific vaccines are needed. Strict Biosecurity: Limit farm access, disinfect equipment, and control movement of birds and personnel to reduce virus spread. Monitor Bird Health Closely: Early detection of respiratory or neurological symptoms can prevent large outbreaks. Educate Farm Staff: Training on recognizing NDV signs and proper vaccination techniques improves overall flock health. Summary Genotype VII NDV strains pose a serious threat to European poultry farms due to their high virulence, prolonged shedding, and challenges with vaccine compatibility. Farms must stay informed about these differences and adjust health management strategies accordingly. By combining vigilant surveillance, updated vaccination programs, and strong biosecurity, European farms can reduce the impact of Genotype VII and protect their flocks from severe Newcastle disease outbreaks. Taking proactive steps today ensures healthier birds and more stable poultry production tomorrow.

Newcastle Disease (ND) has re-emerged as a significant threat to poultry health and the agricultural economy in Europe. After years of relative control, recent outbreaks have raised alarms among veterinary experts and public health officials. Understanding the factors behind this resurgence is essential to prevent further spread and protect both commercial and backyard flocks. This article explores the epidemiological drivers, the evolution of ND virus strains, the role of wild birds in transmission, and the weaknesses in regional biosecurity that have allowed the disease to regain ground. Poultry farm affected by Newcastle Disease in Europe Epidemiological Drivers Behind Newcastle Disease’s Return Newcastle Disease is caused by avian paramyxovirus type 1 (APMV-1), which affects a wide range of bird species. The recent resurgence in Europe is linked to several epidemiological factors: Increased Poultry Density The growth of intensive poultry farming in parts of Europe has created environments where the virus can spread rapidly. High-density flocks facilitate close contact, increasing transmission rates. Global Trade and Movement The import and export of live birds, hatching eggs, and poultry products have introduced new virus strains into European regions. Illegal or unregulated trade routes exacerbate this risk. Climate and Seasonal Changes Mild winters and changing migratory patterns of wild birds have altered the timing and intensity of outbreaks. Warmer conditions may allow the virus to survive longer in the environment. Vaccination Gaps Inconsistent vaccination coverage, especially in backyard and small-scale farms, leaves populations vulnerable. Some regions lack access to effective vaccines or proper administration protocols. A 2023 outbreak in northern Italy demonstrated how a combination of these factors led to rapid spread. The virus entered through imported birds, then moved quickly through dense commercial flocks with limited vaccination coverage. This case highlights the need for coordinated surveillance and control measures. Evolution of Newcastle Disease Virus Strains and Their Impact The ND virus is known for its genetic diversity, with multiple genotypes circulating worldwide. Recent European outbreaks have involved strains with distinct characteristics: Virulence Variation Some strains show increased virulence, causing higher mortality rates in poultry. For example, genotype VII strains, first identified in Asia, have been detected in Eastern Europe and linked to severe outbreaks. Vaccine Escape Mutations Mutations in viral surface proteins have reduced the effectiveness of existing vaccines. This evolution challenges current vaccination strategies and requires updated vaccine formulations. Recombination Events Genetic recombination between different ND virus strains has produced new variants with unpredictable behavior. These recombinant strains may spread more easily or evade immune responses. A study published in 2023 analyzed virus samples from outbreaks in France and Poland, revealing the presence of genotype VII.2 strains with mutations associated with increased transmission. This evolution underscores the importance of genetic monitoring to adapt control measures promptly. Wild Birds as Reservoirs and Vectors of Newcastle Disease Wild birds play a critical role in the ecology of Newcastle Disease. They act as reservoirs and carriers, often without showing symptoms, facilitating virus spread across regions. Migratory Patterns Many wild bird species migrate across Europe and Asia, connecting distant geographic areas. This movement allows the virus to travel long distances and introduce new strains. Species Involvement Waterfowl, pigeons, and some passerine birds have been identified as carriers. Surveillance programs in wetlands and migratory stopovers have detected ND virus RNA in these populations. Environmental Contamination Wild birds can contaminate water sources, feed, and farm environments with virus-laden droppings. This indirect transmission route is especially problematic for free-range and backyard poultry. A 2022 surveillance report from the Netherlands found ND virus in 8% of sampled wild birds during migration season. Genetic analysis linked these viruses to strains causing outbreaks in domestic poultry, confirming the transmission link. Gaps in Regional Biosecurity Measures Despite advances in disease control, several biosecurity weaknesses have contributed to the resurgence of Newcastle Disease in Europe: Inadequate Farm-Level Biosecurity Many small-scale and backyard farms lack basic biosecurity protocols such as controlled access, disinfection stations, and separation of species. This creates entry points for the virus. Insufficient Surveillance and Reporting Delays in detecting and reporting outbreaks reduce the effectiveness of containment. Some regions have limited veterinary resources or fragmented communication networks. Cross-Border Coordination Challenges ND does not respect national borders, but inconsistent policies and enforcement across countries hinder coordinated responses. Limited Public Awareness Farmers and the public may underestimate the risk of ND or fail to recognize early symptoms, delaying intervention. In 2023, a cluster of outbreaks in the Balkans exposed gaps in cross-border cooperation. Different countries applied varying control measures, allowing the virus to persist and spread. This situation highlights the need for harmonized biosecurity standards and joint surveillance efforts. Moving Forward: Strengthening Prevention and Control The resurgence of Newcastle Disease in Europe demands a multi-faceted approach: Enhance Vaccination Programs Improve vaccine coverage, especially in backyard flocks, and update vaccines to match circulating strains. Improve Surveillance Systems Expand wild bird monitoring and integrate data sharing across countries to detect outbreaks early. Strengthen Farm Biosecurity Provide training and resources to farmers on practical biosecurity measures tailored to different farm sizes. Promote Regional Cooperation Develop unified policies and rapid response teams to manage outbreaks effectively. By addressing these areas, Europe can reduce the impact of Newcastle Disease and protect its poultry industry. Newcastle Disease’s return to Europe is a clear signal that vigilance must continue. Understanding the drivers behind its resurgence, monitoring evolving strains, recognizing the role of wild birds, and closing biosecurity gaps are essential steps. Stakeholders from farmers to policymakers must work together to build stronger defenses against this persistent threat.

Newcastle disease has surged across Europe in 2026, raising alarms among poultry farmers and animal health authorities. This viral infection threatens poultry health, disrupts production, and poses significant economic challenges. Understanding the causes, spread, and consequences of this outbreak is essential for farmers, veterinarians, and policymakers to respond effectively and protect the poultry industry. Newcastle disease outbreaks by country 2022-2026 (ADIS) What Is Newcastle Disease? Newcastle disease is a contagious viral infection affecting birds, especially domestic poultry like chickens, turkeys, and ducks. The virus spreads rapidly through direct contact with infected birds, contaminated equipment, feed, or water. It causes respiratory distress, nervous system disorders, and a drop in egg production. Mortality rates can be high, especially in unvaccinated flocks. The disease is caused by the Newcastle disease virus (NDV), which has several strains varying in severity. The most virulent strains cause severe illness and death, while milder strains may only cause mild symptoms or go unnoticed. Why Is Newcastle Disease Rising in Europe? Several factors contribute to the rise of Newcastle disease cases in Europe in 2026: Increased movement of birds and poultry products: Trade and transport of live birds and poultry products across borders can introduce the virus to new areas. Wild birds as carriers: Migratory wild birds can carry the virus over long distances, spreading it to domestic flocks. Gaps in vaccination coverage: Some farms may have incomplete or inconsistent vaccination programs, leaving birds vulnerable. Biosecurity weaknesses: Poor hygiene, lack of disinfection, and inadequate control of visitors and equipment can facilitate virus spread. Climate and environmental changes: Changes in weather patterns may affect bird migration and virus survival outside hosts. Newcastle disease outbreaks in poultry Europe 2022-2026 (since 11 may 2026- source RASVE-ADIS) Impact on Poultry Farming The outbreak has several direct and indirect effects on poultry farming in Europe: Health and Production Losses High mortality rates in infected flocks reduce the number of marketable birds. Sick birds produce fewer eggs, affecting egg supply and farmer income. Survivors may suffer long-term health issues, reducing growth rates and feed efficiency. Economic Consequences Farmers face losses from dead birds, reduced production, and costs of treatment and control measures. Trade restrictions and bans on poultry products from affected regions limit market access. Increased costs for vaccination, biosecurity upgrades, and surveillance strain farm budgets. Supply Chain Disruptions Poultry processors and retailers may experience shortages, leading to higher prices. Consumers may face limited availability of poultry meat and eggs. Exporters lose competitiveness due to disease-related trade barriers. Measures to Control and Prevent Newcastle Disease Effective control depends on coordinated efforts by farmers, veterinarians, and authorities. Key measures include: Vaccination programs: Regular and comprehensive vaccination of poultry flocks reduces susceptibility. Strict biosecurity: Limiting access to farms, disinfecting equipment, and controlling movement of birds and people. Surveillance and early detection: Monitoring flocks for symptoms and testing suspicious cases helps contain outbreaks. Public awareness and training: Educating farmers and workers on disease signs and prevention practices. Regulation and trade controls: Implementing quarantine and movement restrictions to prevent spread. Case Study: Response in a European Poultry Region In one affected region, authorities quickly imposed movement restrictions and launched a vaccination campaign after detecting Newcastle disease in several farms. Farmers received training on biosecurity improvements, and surveillance intensified. Within months, new cases declined, and production began to recover. This example shows how rapid response and cooperation can limit the impact of outbreaks. What Poultry Farmers Should Do Now Farmers should take immediate steps to protect their flocks: Review and update vaccination schedules. Strengthen biosecurity measures, including cleaning and disinfection routines. Monitor birds daily for signs like coughing, sneezing, or nervous symptoms. Report suspected cases to veterinary authorities without delay. Avoid introducing new birds without quarantine and health checks. Looking Ahead The rise of Newcastle disease in Europe highlights the vulnerability of poultry farming to infectious diseases. Ongoing vigilance, investment in prevention, and collaboration across countries will be essential to safeguard poultry health and the industry’s future. Farmers who act promptly and follow recommended guidelines can reduce losses and help control the disease. Protecting poultry from Newcastle disease is not only about animal health but also about securing food supply and livelihoods. Staying informed and prepared is the best defense against this growing threat.

Newcastle disease poses a serious threat to poultry farms worldwide. Early detection of this viral infection is crucial to prevent widespread outbreaks that can devastate bird populations and cause significant economic losses. Passive surveillance in birds offers a practical approach to identifying symptoms of Newcastle disease on farms before the virus spreads uncontrollably. This post explores how passive surveillance works, what signs to watch for, and how farmers can implement effective monitoring strategies. What Is Passive Surveillance in Poultry? Passive surveillance means observing and reporting disease symptoms without actively testing every bird. Instead of routine laboratory screening, farmers and farm workers watch for unusual signs or behaviors in their flocks. When symptoms appear, they report these observations to veterinary authorities or animal health experts for further investigation. This approach relies heavily on the knowledge and attentiveness of those who work closely with the birds daily. It is cost-effective and practical, especially for small to medium-sized farms that may not have resources for constant testing. Why Focus on Newcastle Disease? Newcastle disease is a contagious viral infection affecting many bird species, especially chickens. It spreads through direct contact with infected birds, contaminated equipment, or airborne particles. The disease can cause respiratory distress, nervous system disorders, and sudden death. Because Newcastle disease spreads quickly, early detection is vital. Passive surveillance helps catch the first signs of infection, allowing farmers to isolate affected birds and notify authorities to prevent an outbreak. Key Symptoms to Watch For Farmers should be familiar with the common symptoms of Newcastle disease to recognize potential cases early. These include: Respiratory signs: coughing, sneezing, nasal discharge, and difficulty breathing Nervous system symptoms: tremors, paralysis, twisted necks, and loss of balance Digestive issues: diarrhea and decreased appetite Drop in egg production: sudden reduction in the number or quality of eggs Swelling around the eyes and neck: inflammation and redness Sudden death: unexplained mortality in otherwise healthy birds Not all symptoms appear at once, and some may resemble other diseases. That’s why reporting any unusual behavior or signs promptly is essential. How to Implement Passive Surveillance on Farms Successful passive surveillance depends on training and clear communication. Here are practical steps farmers can take: Educate farm workers: Train everyone involved in bird care to recognize Newcastle disease symptoms and understand the importance of reporting. Keep detailed records: Maintain logs of bird health, mortality rates, and any unusual signs observed. This helps track patterns and identify outbreaks early. Establish reporting protocols: Create clear guidelines on how and when to report suspected cases to veterinary services. Regular visual inspections: Conduct daily checks of birds, focusing on behavior, physical condition, and environment. Maintain biosecurity: Limit access to poultry areas, disinfect equipment, and control visitors to reduce disease risk. By embedding these practices into daily routines, farms can detect problems faster and respond effectively. Benefits and Limitations of Passive Surveillance Passive surveillance offers several advantages: Cost-effective: Requires minimal investment compared to active testing programs. Practical: Fits well with existing farm operations without disrupting daily work. Early warning: Helps identify outbreaks before they escalate. However, it also has limitations: Relies on human observation: Symptoms may be missed or misinterpreted without proper training. Delayed detection: Some infected birds may not show symptoms immediately, allowing silent spread. Not a substitute for laboratory testing: Confirmatory diagnosis requires lab analysis. Farmers should use passive surveillance as part of a broader disease control strategy that includes vaccination, biosecurity, and active monitoring when possible. Real-World Example of Passive Surveillance Success In a poultry region of Southeast Asia, a network of small farms implemented passive surveillance by training workers to spot Newcastle disease symptoms. When one farm noticed sudden nervous signs and respiratory distress in their flock, they reported it immediately. Veterinary teams confirmed the diagnosis and helped contain the outbreak through quarantine and vaccination. This early action prevented the virus from spreading to neighboring farms, saving thousands of birds and reducing economic losses. The case highlights how simple observation and prompt reporting can make a big difference. Final Thoughts on Protecting Poultry with Passive Surveillance Newcastle disease remains a constant threat to poultry farms, but passive surveillance empowers farmers to act quickly. By knowing what symptoms to watch for and establishing clear reporting systems, farms can detect infections early and limit damage.

Newcastle disease remains one of the most significant threats to poultry health worldwide. Despite widespread vaccination efforts, outbreaks continue to occur, often linked to the emergence of new virus genotypes. Among these, genotype VII of the Newcastle disease virus (NDV) has gained attention for its ability to challenge the effectiveness of existing vaccines. This post explores how genotype VII affects vaccine performance in vaccinated farms and what poultry producers can do to manage this evolving threat. Genotype VII Newcastle virus impact on vaccinated poultry farms Understanding Newcastle Disease and Its Genotypes Newcastle disease is caused by the Newcastle disease virus, a highly contagious pathogen affecting birds, especially chickens. The virus has multiple genotypes, which are genetic variations that influence its behavior and virulence. Genotype VII has emerged as a dominant strain in many regions, known for causing severe outbreaks even in vaccinated flocks. Genotype VII differs genetically from the strains used in most traditional vaccines. This genetic variation can affect how well the immune system of vaccinated birds recognizes and fights the virus. As a result, farms that rely on standard vaccines may experience unexpected disease outbreaks. How Genotype VII Challenges Vaccine Efficacy Vaccines work by exposing the immune system to a harmless form of the virus or its components, training it to respond quickly to real infections. However, when the virus mutates or belongs to a different genotype, the immune response may not be as effective. In the case of genotype VII, studies have shown: Reduced protection: Vaccines based on older genotypes may not fully protect birds against genotype VII, leading to higher infection rates. Increased virus shedding: Infected vaccinated birds can still shed the virus, spreading it within and between farms. Severe clinical signs: Even vaccinated flocks may show symptoms such as respiratory distress, decreased egg production, and increased mortality. These factors contribute to ongoing outbreaks and economic losses despite vaccination programs. Real-World Examples of Genotype VII Impact Several outbreaks linked to genotype VII have been reported globally. For instance: In Southeast Asia, genotype VII caused widespread disease in vaccinated commercial farms, prompting a review of vaccine strategies. In parts of Africa, genotype VII outbreaks led to significant mortality in vaccinated village flocks, affecting local livelihoods. Research in South America identified genotype VII as the main cause of recent Newcastle disease outbreaks despite vaccination efforts. These cases highlight the need for updated vaccines and improved disease management practices. Strategies to Improve Vaccine Effectiveness Against Genotype VII To address the challenges posed by genotype VII, poultry producers and veterinarians can consider the following approaches: Use of Genotype-Matched Vaccines Developing and using vaccines that include genotype VII strains can improve immune protection. These vaccines better mimic the circulating virus, leading to stronger and more specific immune responses. Enhanced Biosecurity Measures Vaccination alone is not enough. Farms should implement strict biosecurity protocols to reduce virus introduction and spread, such as: Controlling farm access and visitor movement Regular cleaning and disinfection of facilities Proper disposal of dead birds and waste Monitoring and Surveillance Regular monitoring of virus genotypes circulating in the region helps identify emerging threats early. Surveillance allows timely updates to vaccination programs and control measures. Proper Vaccination Practices Ensuring vaccines are stored, handled, and administered correctly maximizes their effectiveness. This includes following recommended schedules and dosages. The Role of Research and Innovation Ongoing research is crucial to stay ahead of genotype VII and other emerging strains. Scientists are exploring: New vaccine technologies such as recombinant and vector vaccines Genetic studies to understand virus evolution Field trials to test vaccine performance under real farm conditions These efforts aim to provide poultry producers with better tools to protect their flocks. What Poultry Producers Should Do Now Producers should work closely with veterinarians to: Review current vaccination protocols Consider genotype-specific vaccines if available Strengthen biosecurity and farm management Participate in local disease surveillance programs Taking proactive steps can reduce the risk of outbreaks and protect flock health and productivity.

Newcastle disease has resurfaced as a significant concern in Spain, raising alarms among poultry farmers, veterinarians, and public health officials. This viral disease affects birds, especially poultry, and can cause severe economic losses and trade restrictions. Understanding why Spain must remain vigilant against Newcastle disease is crucial for protecting the poultry industry and public health. What Is Newcastle Disease? Newcastle disease is a contagious viral infection caused by the avian paramyxovirus type 1. It affects many bird species, including chickens, turkeys, and wild birds. The disease varies in severity, ranging from mild respiratory symptoms to sudden death. Highly virulent strains can wipe out entire flocks within days. The virus spreads through direct contact with infected birds, contaminated equipment, feed, water, and even airborne particles. Wild birds often act as carriers, introducing the virus to domestic poultry farms. Recent Outbreaks in Spain Spain has experienced several outbreaks of Newcastle disease in recent years. These outbreaks have mainly affected commercial poultry farms but also backyard flocks. The resurgence is linked to several factors: Wild bird migration: Spain lies on migratory routes, increasing the risk of virus introduction from infected wild birds. Illegal poultry trade: Unregulated movement of birds can spread the virus between regions. Biosecurity lapses: Some farms may not follow strict hygiene and containment measures, allowing the virus to enter and spread. For example, in 2022, an outbreak in Andalusia led to the culling of thousands of birds and temporary trade restrictions. This event highlighted the need for continuous monitoring and rapid response. Why Is It Important to Stay Alert? Newcastle disease poses several risks that justify ongoing vigilance: Economic Impact The poultry industry is a vital part of Spain’s agriculture, contributing billions of euros annually. An outbreak can cause: Loss of birds due to illness and culling Decreased egg and meat production Export bans from trading partners Increased costs for vaccination and control measures The 2022 outbreak alone resulted in millions of euros in losses for affected farms and related businesses. Public Health Concerns While Newcastle disease primarily affects birds, it can cause mild conjunctivitis and flu-like symptoms in humans who handle infected birds. Although rare, these cases underscore the importance of protective measures for workers in poultry farms and processing plants. Trade and Regulatory Pressure The European Union and other trading partners impose strict regulations on poultry products. An outbreak can lead to: Suspension of exports Increased inspections and testing Stricter import controls on live birds and products Maintaining disease-free status is essential for Spain to remain competitive in international markets. Measures to Prevent and Control Newcastle Disease Spain has implemented several strategies to manage Newcastle disease risks: Surveillance and Early Detection Regular monitoring of poultry farms and wild bird populations helps detect the virus early. Veterinary authorities conduct testing and report outbreaks promptly to contain spread. Vaccination Programs Vaccination is a key tool to protect poultry. Spain uses different vaccines depending on the risk level and poultry type. Vaccination reduces virus shedding and clinical signs, limiting transmission. Biosecurity Practices Farmers are encouraged to adopt strict biosecurity measures, such as: Controlling access to poultry houses Disinfecting equipment and vehicles Isolating new or sick birds Preventing contact with wild birds These steps reduce the chance of virus introduction and spread. Public Awareness and Training Educating farmers, workers, and the public about Newcastle disease symptoms, transmission, and prevention helps improve early reporting and compliance with control measures. What Can Poultry Farmers Do? Farmers play a critical role in preventing Newcastle disease outbreaks. They should: Monitor flocks daily for signs like coughing, sneezing, or sudden deaths Report suspicious cases to veterinary authorities immediately Follow vaccination schedules recommended by veterinarians Maintain high biosecurity standards on their farms Avoid buying birds from unknown or unregulated sources By taking these actions, farmers protect their flocks and livelihoods. The Role of Authorities and the Community Government agencies must continue funding surveillance, research, and rapid response teams. Collaboration between regions and countries is essential to track virus movement and share information. The community can support efforts by: Avoiding illegal trade of birds Reporting dead wild birds or sick poultry Supporting local farmers in biosecurity efforts Looking Ahead Newcastle disease will likely remain a threat as long as wild birds migrate and poultry farming continues. Spain’s experience shows that vigilance, preparedness, and cooperation are key to minimizing impact. Investing in research for better vaccines and rapid diagnostic tools will improve control. Strengthening regulations and enforcement can reduce illegal bird movements. The poultry industry, authorities, and the public must work together to keep Spain free from Newcastle disease outbreaks and protect this important sector.

La enfermedad de Newcastle ha tomado un protagonismo preocupante en Europa durante los últimos años. La presión epidemiológica se ha intensificado de manera significativa, afectando a millones de aves y poniendo en jaque a la avicultura en varios países. El informe de mayo de 2026 revela una circulación muy activa del virus, con un aumento alarmante de focos que exige atención inmediata y medidas contundentes para controlar su expansión. Crecimiento acelerado de focos en Europa Entre 2022 y 2026, Europa ha registrado un total de 269 focos de la enfermedad de Newcastle en aves de corral, afectando a más de 15,4 millones de aves. La curva de contagios muestra un crecimiento preocupante: En 2023 se reportaron solo 11 focos. En 2025, los focos aumentaron a 100. En lo que va de 2026, ya se han registrado 105 focos. Este aumento constante refleja la dificultad para contener el virus y la necesidad de reforzar las estrategias de prevención y control en todo el continente. Polonia y Alemania: epicentros de la cepa rusa Polonia Polonia se ha convertido en el país más afectado de Europa del Este. Desde 2023, la enfermedad ha reaparecido con fuerza, registrando 86 focos en 2025 y 48 en lo que va de 2026. La gravedad de la situación llevó a las autoridades a imponer la vacunación obligatoria en todo el territorio desde 2025. Los análisis moleculares han identificado dos introducciones distintas del genotipo VII.1.1, estrechamente relacionadas con una cepa detectada en Rusia en 2022. Esto indica una conexión directa con la circulación viral en la región rusa, lo que complica la contención y exige cooperación internacional para frenar la propagación. Alemania Después de años sin casos, Alemania sufrió un brote en febrero de 2026 en una granja comercial de 18.000 pavos en Brandeburgo. Desde entonces, se han confirmado 51 brotes adicionales. Los estudios genéticos muestran que el virus alemán está muy relacionado con el de Polonia, lo que sugiere una expansión regional de la cepa rusa. Este resurgimiento ha obligado a las autoridades alemanas a implementar medidas estrictas de bioseguridad y vigilancia epidemiológica para evitar que el virus se extienda a otras regiones del país. Suecia y Finlandia: diferentes caminos frente a la enfermedad Suecia y Finlandia representan dos casos contrastantes en el manejo de la enfermedad de Newcastle en Europa. Suecia: Tradicionalmente considerada zona libre sin necesidad de vacunación, ha perdido este estatus debido a brotes esporádicos en los últimos años. El brote más significativo ocurrió en 2024, afectando a más de 230.000 aves. Ante esta situación, Suecia decidió implementar la vacunación preventiva en abril de 2026 para proteger su industria avícola. Finlandia: Actualmente, es el único país europeo que mantiene el estatus de libre de la enfermedad sin necesidad de vacunación. Su éxito se atribuye a estrictas medidas de bioseguridad, vigilancia constante y control en las fronteras avícolas. El brote español: un caso independiente En España, los brotes detectados en Valencia han generado preocupación, pero los análisis genéticos aportan un dato tranquilizador. Aunque el virus pertenece al genotipo VII, se ha confirmado que es epidemiológicamente independiente de los brotes en Alemania y Polonia. Esto significa que el brote español no está relacionado con la cepa rusa que afecta a Europa del Este y Alemania, lo que reduce el riesgo de una expansión directa desde esos países. Sin embargo, la vigilancia y el control siguen siendo esenciales para evitar nuevas introducciones y propagaciones. Medidas clave para enfrentar la enfermedad Frente a esta situación, la avicultura europea debe adoptar medidas claras y efectivas para controlar la enfermedad de Newcastle: Vacunación obligatoria en zonas de alto riesgo, como ya ocurre en Polonia y Suecia. Refuerzo de la bioseguridad en granjas comerciales y pequeñas explotaciones. Monitoreo constante mediante secuenciación molecular para identificar cepas y rutas de transmisión. Cooperación internacional para compartir información y coordinar respuestas rápidas. Capacitación y sensibilización de productores y técnicos sobre la importancia de la prevención. Estas acciones ayudarán a reducir la incidencia de la enfermedad y protegerán la producción avícola, que es vital para la economía y la seguridad alimentaria. Impacto económico y social La enfermedad de Newcastle no solo afecta a las aves, sino que también tiene consecuencias económicas y sociales importantes: Pérdidas económicas por sacrificios masivos y restricciones comerciales. Aumento de costos en vacunación y medidas de bioseguridad. Riesgo para el empleo en zonas rurales dependientes de la avicultura. Incertidumbre en el mercado nacional e internacional de productos avícolas. Por eso, es fundamental que los gobiernos, productores y expertos trabajen juntos para minimizar estos impactos y garantizar la sostenibilidad del sector. Reflexiones finales La enfermedad de Newcastle representa un desafío creciente para Europa en 2026. El aumento de focos y la circulación activa del virus exigen una respuesta coordinada y efectiva. La experiencia de países como Polonia, Alemania, Suecia y Finlandia muestra que la combinación de vacunación, bioseguridad y vigilancia puede marcar la diferencia. Para los productores avícolas, mantenerse informados y aplicar las recomendaciones es clave para proteger sus aves y su negocio. La colaboración entre países y el intercambio de datos científicos serán herramientas esenciales para controlar esta amenaza y asegurar un futuro estable para la avicultura europea.

La enfermedad de Newcastle sigue siendo una amenaza latente para las granjas avícolas, especialmente con la circulación local del virus. Aunque la vacunación ha reducido la severidad de los síntomas visibles, esto dificulta la detección temprana. Por eso, el Ministerio insiste en la importancia de la vigilancia pasiva para identificar signos sutiles que podrían indicar la presencia del virus. Detectar estos síntomas a tiempo es clave para evitar brotes mayores y proteger la producción avícola. Gallinas ponedoras en granja avícola durante vigilancia pasiva Qué es la vigilancia pasiva y por qué es vital La vigilancia pasiva consiste en observar y registrar cualquier anomalía o cambio en el comportamiento y estado de las aves sin realizar intervenciones activas constantes. En el contexto de la enfermedad de Newcastle, esta vigilancia se basa en la detección de síntomas que no siempre son evidentes, pero que pueden indicar la presencia del virus. Con la vacunación, los síntomas clásicos como alta mortalidad o signos neurológicos severos se han atenuado. Esto hace que la enfermedad pueda pasar desapercibida si no se presta atención a detalles más sutiles. Por eso, la vigilancia pasiva se convierte en una herramienta esencial para la detección temprana y el control efectivo. Síntomas sutiles que deben alertar a los avicultores El informe reciente sobre los últimos focos detectados destaca varios signos que pueden parecer menores, pero que son indicios importantes de la enfermedad: Mortalidad moderada o goteo diario de aves muertas No es necesario que haya una alta mortalidad para sospechar. Un aumento leve y constante en la muerte de aves puede ser una señal de alerta. Leves caídas o anomalías en el consumo de pienso o agua Cambios pequeños en la alimentación o hidratación diaria pueden indicar que las aves están enfermas o estresadas. Disminución en la tasa de puesta de huevos Un ejemplo claro ocurrió en Castelló de Rugat en mayo de 2026, donde no se registró mortalidad, pero sí una caída del 7% en la puesta durante un mes. Este dato muestra que la enfermedad puede manifestarse solo con una reducción en la productividad. Apatía generalizada y edemas faciales Las aves pueden mostrar falta de energía, estar menos activas o presentar hinchazón en la cara, síntomas que suelen pasar desapercibidos si no se observa con cuidado. Síntomas digestivos leves Cambios en la consistencia de las heces o signos leves de malestar digestivo también pueden ser indicios. Cómo actuar ante una sospecha Ante cualquier indicio sospechoso, el protocolo oficial es claro: comunicar inmediatamente a los Servicios Veterinarios Oficiales de las Comunidades Autónomas. Retrasar esta comunicación puede facilitar la diseminación del virus, especialmente en zonas con alta concentración de granjas o integradoras. El aviso temprano permite activar medidas de control y evitar que el virus se propague a otras explotaciones cercanas. La colaboración entre avicultores y autoridades es fundamental para contener la enfermedad. Consejos prácticos para mejorar la vigilancia pasiva Para que la vigilancia pasiva sea efectiva, los avicultores pueden implementar algunas prácticas sencillas: Registrar diariamente la mortalidad y consumo de alimento y agua Llevar un control detallado ayuda a detectar cambios mínimos que podrían pasar desapercibidos. Observar el comportamiento de las aves en diferentes momentos del día La apatía o cambios en la actividad pueden ser más evidentes en ciertos momentos. Revisar la producción de huevos con regularidad Comparar la tasa de puesta con periodos anteriores para identificar caídas inesperadas. Capacitar al personal para reconocer síntomas sutiles Un equipo bien informado puede detectar señales tempranas y actuar rápido. Mantener una comunicación fluida con veterinarios y autoridades Esto facilita la respuesta rápida ante cualquier sospecha. Caso real, mayo 2026 En este foco detectado en gallinas ponedoras, no hubo mortalidad registrada. Sin embargo, se observó una caída del 7% en la puesta durante un mes. Este caso demuestra que la enfermedad puede manifestarse sin signos dramáticos, pero con impactos económicos importantes. La detección temprana gracias a la vigilancia pasiva permitió tomar medidas para controlar el brote y evitar su expansión. Este ejemplo resalta la importancia de no subestimar cambios aparentemente menores en la producción.

El brote reciente del virus de Newcastle en la Comunidad Valenciana ha puesto en evidencia un desafío importante para la avicultura local: la circulación del genotipo VII, una cepa velogénica altamente virulenta. A pesar de las medidas de vacunación implementadas en muchas granjas, se han detectado focos de infección incluso en aquellas que ya estaban vacunadas. ¿Por qué ocurre esto? El virus de Newcastle y sus genotipos El virus de Newcastle es un patógeno que afecta a las aves y puede causar graves pérdidas económicas en la industria avícola. Científicamente, se han identificado hasta 21 genotipos diferentes del virus, cada uno con características propias en cuanto a virulencia y respuesta inmunitaria. El genotipo VII, que actualmente circula en la Comunidad Valenciana, se clasifica como velogénico, lo que significa que es altamente virulento y puede provocar cuadros clínicos severos en las aves. Esta cepa representa un reto mayor para el control de la enfermedad debido a su capacidad de propagación rápida y su impacto en la salud aviar. La paradoja de las granjas vacunadas En los últimos brotes detectados en Valencia, se han registrado 10 focos de infección, de los cuales 5 ocurrieron en granjas que ya habían aplicado la vacunación contra el virus de Newcastle. Esto genera una pregunta clave: ¿por qué fallan las vacunas en estos casos? La respuesta radica en la diferencia entre los genotipos de las cepas utilizadas en las vacunas y el virus que está circulando. Las vacunas autorizadas en España y Europa emplean cepas pertenecientes a los genotipos I y II, mientras que el virus presente en los brotes es del genotipo VII. Esta diferencia genética puede reducir la eficacia de la vacuna para prevenir la infección completa. No obstante, esta situación no implica una falta total de protección. Las vacunas siguen ofreciendo beneficios importantes que ayudan a controlar la enfermedad y limitar su impacto. Beneficios de la vacunación frente al genotipo VII Aunque la vacuna no siempre evita la infección, su uso tiene efectos positivos claros: Reducción del riesgo de infección: Las aves vacunadas tienen menos probabilidades de infectarse, lo que disminuye la incidencia general del virus en la granja. Menor excreción viral: Cuando las aves vacunadas se infectan, liberan menos virus al ambiente, lo que reduce la posibilidad de contagio a otras aves y granjas. Limitación de la diseminación: La vacunación contribuye a contener la propagación del virus, evitando brotes más extensos y graves. Un ejemplo técnico que ilustra este beneficio ocurrió en el foco de Terrateig en marzo de 2026. En esta granja, de cinco naves vacunadas, solo se infectó la nave con las aves más jóvenes, mientras que las otras cuatro permanecieron protegidas. Esto demuestra que la vacunación puede limitar el alcance del brote y proteger a la mayoría del rebaño. Riesgos clínicos y vigilancia constante Un efecto secundario de la vacunación es que las aves infectadas pueden presentar síntomas menos evidentes o atípicos. Esto dificulta la detección temprana de la enfermedad y puede llevar a que los productores no identifiquen el problema a tiempo. Por esta razón, es fundamental que los productores mantengan una vigilancia estricta, incluso en granjas vacunadas. La observación cuidadosa y la realización de pruebas diagnósticas periódicas son esenciales para detectar cualquier signo de infección y actuar rápidamente. Nuevas normativas y medidas obligatorias Ante la circulación del genotipo VII y la aparición de brotes en granjas vacunadas, las autoridades veterinarias han establecido medidas más estrictas en la Comunidad Valenciana. La vacunación, que hasta ahora era voluntaria y recomendada, se ha convertido en obligatoria de forma temporal en las zonas afectadas o consideradas de riesgo. Esta decisión busca aumentar la cobertura vacunal y reducir la propagación del virus, protegiendo tanto a las aves como a la economía avícola regional. Qué pueden hacer los productores Para enfrentar este desafío, los productores deben: Cumplir con la vacunación obligatoria en las zonas indicadas. Mantener protocolos de bioseguridad estrictos para evitar la entrada y salida del virus. Realizar monitoreos constantes para detectar síntomas, incluso leves o atípicos. Colaborar con las autoridades veterinarias para reportar cualquier sospecha y seguir las recomendaciones oficiales. Reflexión final El brote del genotipo VII del virus de Newcastle en la Comunidad Valenciana muestra que la vacunación, aunque no es infalible, sigue siendo una herramienta clave para controlar la enfermedad. La diferencia entre genotipos explica por qué algunas granjas vacunadas pueden verse afectadas, pero también destaca la importancia de no bajar la guardia. La combinación de vacunación obligatoria, vigilancia activa y buenas prácticas de manejo puede reducir significativamente el impacto de este virus velogénico. Los productores tienen un papel fundamental para proteger sus aves y garantizar la salud del sector avícola en la región.

La enfermedad de Newcastle ha vuelto a encender las alarmas en España después de un periodo de relativa calma. Esta infección aviar, causada por el paramixovirus tipo 1 (APMV-1), afecta principalmente a las gallinas, pero también puede encontrarse en palomas y aves silvestres que actúan como portadoras. La reciente aparición de varios focos ha puesto en evidencia la necesidad de mantener una vigilancia constante para evitar su propagación y proteger la avicultura nacional. Granja avícola afectada por la enfermedad de Newcastle en Valencia ¿Qué es la enfermedad de Newcastle? La enfermedad de Newcastle es una infección viral que afecta a las aves domésticas y silvestres. El virus responsable, APMV-1, puede causar desde síntomas leves hasta cuadros graves que incluyen la muerte de las aves. Aunque la enfermedad afecta principalmente a gallinas, también se ha detectado en palomas y otras aves silvestres, que pueden actuar como reservorios y facilitar la diseminación del virus. El virus se transmite por contacto directo con aves infectadas, sus secreciones o materiales contaminados, como el agua, alimento o el ambiente de las granjas. La alta contagiosidad y la variedad de síntomas hacen que su control sea un desafío para los productores avícolas. Situación actual en España Después de un periodo sin casos reportados desde junio de 2022, el 29 de diciembre de 2025 se confirmó un foco en una granja de pollos de engorde en la provincia de Valencia. Desde entonces, la cifra de focos ha aumentado a 10, todos concentrados en la comarca de Vall d’Albaida, afectando tanto a granjas de pollos de engorde como a explotaciones de gallinas ponedoras. Esta concentración geográfica sugiere una circulación activa del virus en la zona, lo que obliga a las autoridades y productores a extremar las medidas de bioseguridad y vigilancia para evitar una expansión mayor. Síntomas clave para identificar la enfermedad Reconocer los síntomas de la enfermedad de Newcastle es fundamental para actuar con rapidez. La infección puede manifestarse de diferentes formas, pero algunos signos son característicos: Infección respiratoria: tos, estornudos, dificultad para respirar. Depresión y falta de apetito: las aves muestran letargo y disminución en la ingesta de alimento. Diarreas: evacuaciones líquidas y frecuentes. Síntomas nerviosos: temblores, parálisis parcial o total, pérdida del equilibrio. Estos síntomas pueden aparecer de forma aislada o combinada, y su presencia debe alertar a los productores para solicitar análisis veterinarios y confirmar o descartar la enfermedad. Impacto en la avicultura y medidas de prevención La enfermedad de Newcastle puede causar pérdidas económicas significativas debido a la mortalidad, disminución en la producción de huevos y la necesidad de sacrificar aves infectadas para controlar el brote. Además, afecta la comercialización y exportación de productos avícolas. Para minimizar el impacto, es crucial implementar medidas de prevención: Vigilancia pasiva: observar cualquier cambio en el comportamiento o salud de las aves y reportar sospechas. Bioseguridad estricta: controlar el acceso a las granjas, desinfectar instalaciones y equipos, y evitar el contacto con aves silvestres. Control de movimientos: restringir el traslado de aves y productos avícolas en zonas afectadas. Vacunación: en algunas regiones, se utiliza la vacunación como herramienta complementaria para reducir la susceptibilidad. La importancia de la vigilancia continua El reciente brote en Valencia recuerda que la enfermedad de Newcastle no ha desaparecido y que la vigilancia debe mantenerse activa. Los productores, veterinarios y autoridades deben colaborar para detectar cualquier indicio clínico y actuar con rapidez. La detección temprana permite aislar focos, aplicar medidas de control y evitar la propagación a otras zonas. Además, la educación y formación sobre los síntomas y riesgos son esenciales para que todos los involucrados en la cadena avícola estén preparados.