Vaccination of birds in event of AI outbreak is expected to do which of the following?

• A. Prevent/reduce disease and production losses
• B. Increase resistance to infection
• C. Reduce virus replication on respiratory and GI surfaces thereby reducing transmission to susceptible birds and reduced environmental contamination
• D. All of the above

Answer: (D)

Vaccinating birds during an avian influenza outbreak is about reducing the overall impact of the outbreak. By stimulating the immune system, vaccination helps prevent or lessen disease and production losses because vaccinated birds are less likely to become sick or die and can maintain production more reliably. It also increases resistance to infection, meaning birds are better prepared to fight off exposure if it occurs. Additionally, vaccination can reduce virus replication on respiratory and gastrointestinal surfaces, which lowers the amount of virus shed into the environment and decreases transmission to susceptible birds, leading to less environmental contamination. Taken together, these effects explain why choosing all of the above is the best answer. Keep in mind that vaccine effectiveness depends on how well the vaccine matches circulating strains and how the vaccination program is implemented, and that surveillance considerations may be influenced by vaccination.