Zoetis was granted a conditional license for its avian influenza vaccine for use in chickens. It's a step closer to fighting the bird flu outbreaks that continue to devastate flocks.

As bird flu cases continue to pop up in humans, Canada announced Wednesday that it purchased 500,000 doses of vaccine targeted at the virus. Here’s what you need to know about bird flu vaccinations in the U.

With so much H5N1 circulating in the U.S., scientists worry we are a few mutations away from a potential human pandemic.