In the past three years, the U.S. Department of Agriculture (USDA) says about 150 million birds died across the country due to the virus. This month, the USDA granted a conditional license to Zoetis for its Avian Influenza Vaccine.

The US Department of Agriculture last week issued a conditional license for an avian flu vaccine for use in chickens, as an outbreak of a newer variant ravages poultry flocks, contributing to the sky high price of eggs.