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.

While the company has conditional approval, the USDA will still have to approve its larger use before farmers can give it to their flocks, according to Science Magazine. The report added that if bird flu becomes more widespread, vaccinating chickens against bird flu could become the norm.