Subclade K, a variant of H3N2, or influenza type A, caused a longer-than-usual season in Australia. That might not be the case here.

Herd immunity is important because it defines when a whole community is protected. That includes people who haven't caught the disease, people who had the illness and recovered, and people who got a ...

Cases of influenza are spiking in Minnesota and across the country. Two school districts in the state went to remote learning because of rapidly spreading flu outbreaks last week, and the Centers for ...