A vaccine could help stop the spread of bird flu in poultry after millions of birds have died from the virus in the past few years.

Michigan’s biggest egg producer is advocating for the vaccination of egg-laying hens against the highly pathogenic avian influenza. Herbruck’ CEO Greg Herbruck has called on the federal government to take “urgent and critical” measures to address the H5N1 bird flu crisis by implementing an aggressive vaccination strategy.

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