After a summer lull in U.S. cases of avian influenza in both poultry and dairy cattle—and no human infections reported in the country since February—the virus is back. The currently circulating ...

It was a quiet summer for bird flu: Egg prices fell a bit, fewer sick poultry flocks were culled on farms, and officials took a breath. “It was lovely,” said Shauna Voss, the assistant director of ...