H5N1 influenza is evolving rapidly, weakening the effectiveness of existing antibodies and increasing its potential threat to ...

The existing vaccines don't match the current strain, and both the U.S. and E.U. have rules on imported birds that are vaccinated.

An avian influenza vaccine for layers, broilers, and practical for farmers was developed thanks to innovative technology ...

So there's still a debate, and even though we do have a licensed vaccine, it's unclear if the USDA will authorize its use. Eggs are definitely the hardest hit when it comes to bird flu.