As USDA continues to work with state and local officials impacted by this year’s devastating outbreak of avian influenza, government officials say they have evaluated the efficacy of available vaccine options for HPAI, but determined additional criteria must be met before a vaccine can be approved for emergency use.
Currently, USDA says the only vaccine available is effective just 60 percent of the time in chickens, which would leave four in ten birds unprotected. Its effectiveness in turkeys is still being studied.