In Mexico chicken are vaccinated, but Clifford said the country doesn't slaughter flocks when infections are found. That basically ensures the virus is present in poultry.
China still slaughters vaccinated flocks when infections are found, which has proven more effective at limiting the spread of the virus and reigning in outbreaks.
Clifford said the U.S. would need to continue culling flocks with outbreaks even after vaccinating, and it might make sense to give shots only to egg layers and turkeys, not broilers.
Don't expect big relief anytime soon.
The USDA, which did not respond to a request for comment for this article sent last week, clearly isn't moving to vaccinate immediately. And, regardless, it will take time to raise new hens.