Vaccination for AI H5 is not a preferred option of control because of trade issues.

• A. True
• B. False
• C. Not applicable
• D. Unknown

Answer: (A)

The main idea here is that trade implications strongly influence disease-control choices. Vaccinating poultry against avian influenza H5 can prevent illness and reduce transmission, but it often complicates international trade. Exporting countries rely on proving a flock is free of infection, and vaccination can cause serological tests to show antibodies that resemble an infection, making it harder to certify disease-free status. Unless vaccines and tests are designed to differentiate infected from vaccinated animals (DIVA), many trading partners impose restrictions or require extensive surveillance, which diminishes the appeal of vaccination as a routine control measure. Because preserving access to export markets is a priority in many AI control programs, vaccination is typically not the preferred option for AI H5. That’s why this statement is considered true.