Newcastle disease (ND) is a notable concern for the poultry industry, causing high mortality and severe tissue lesions in various systems of poultry. Effective vaccination is crucial for controlling the disease. Here are some key points from the provided sources:
- Vaccine Efficacy: To achieve herd immunity, at least 85% of animals must receive a sufficient vaccine dose, triggering a haemagglutination-inhibition (HI) antibody titre of ≥ 3 log 2.
- Vaccination Strategies: Different vaccination regimes may include dual (live/killed) priming of chicks, followed by multiple live vaccinations. Though, using mixed vaccines may lead to competition between pathogens and potentially reduce the effectiveness of the vaccines.
- Expert Opinion: Experts suggest that a single vaccine should be used to ensure adequate preventive effects. Excessive use of certain vaccines, like those for infectious bronchitis, can reduce respiratory system immunity and increase the risk of multiple infections.
- Policy Improvement: Effective disease management is crucial for poultry productivity. Policy improvements based on expert veterinary opinions are necessary to enhance the effectiveness of vaccination strategies.
For more detailed information, you can refer to the full articles and PDFs from the provided urls.
Table of Contents
Newcastle disease (ND) continues to pose significant challenges for the poultry industry, causing high mortality rates and severe tissue damage. Effective vaccination is essential to managing and controlling this disease. We sat down with leading poultry expert Dr. Jane thompson to discuss strategies, efficacy, and the importance of policy improvements in battling ND.
Vaccine efficacy
Editor (E): dr. Thompson,to what extent is vaccine efficacy crucial in controlling Newcastle disease in poultry?
Dr. Jane Thompson (JT): Achieving herd immunity is vital to controlling Newcastle disease. The vaccine needs to trigger a haemagglutination-inhibition (HI) antibody titre of at least 3 log 2 in around 85% of the poultry population. This ensures a protective immune response within the flock. When the proper threshold is met, it significantly reduces the risk of outbreaks and potential widespread infection.
Vaccination Strategies
E: Can you explain some common vaccination strategies and how they impact poultry health?
JT: Ther are several strategies employed, such as dual priming with live and killed vaccines, followed by multiple subsequent vaccinations. Though, there is a caveat to using mixed vaccines. Pathogens can sometimes compete, reducing the effectiveness of the vaccines. It’s essential to balance the priming to ensure robust immunity without undermining the system.
Expert Opinion
E: What are your thoughts on using a single vaccine versus multiple vaccines to ensure adequate preventive effects?
JT: Experts suggest using a single vaccine to avoid complications. Excessive use of vaccines, particularly for infections like infectious bronchitis, can weaken respiratory immunity and elevate the risk of multiple infections. Striking the right balance is key to maintaining strong immune responses without compromising other essential defenses.
Policy Improvement
E: In your experience,what role do policy improvements play in the effectiveness of vaccination strategies?
JT: Effective disease management is paramount for maintaining poultry productivity. Improvements in policy based on expert veterinary opinions are necessary to enhance vaccination strategies. This includes regular updates in guidelines, support for research and development, and ensuring the proper education of those administering vaccines.
E: Dr. Thompson, thank you for your invaluable insights. Where can our readers find more detailed data about these subjects?
JT: You can find more detailed information in the full articles and PDFs available from the provided URLs. It is indeed crucial to stay informed and up-to-date with the latest developments to achieve optimal control of Newcastle disease.