The company, Zoetis, said this license was granted on the “demonstration of safety, purity, and reasonable expectation of efficacy.”

The Government of Canada has secured an initial supply of 500,000 doses of GSK's bird flu vaccine to protect individuals most at risk of being exposed to the virus through animals infected with avian influenza.

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.