Influenza A and B are the most common types of flu in humans. Here, learn about the differences between influenza A and B, ... Share on Pinterest by Alfian Widiantono/Getty Images.

“Influenza B can be severe as well, but influenza A is the dominant version of influenza infecting people right now.” The flu season feels worse than normal this year. Is it?

Avian influenza A(H5N1) virus is spreading through dairy herds across the United States. In this report, wastewater surveillance shows the increase of H5N1 across 10 urban communities.

U.S. flu vaccines were redesigned after an influenza strain disappeared globally. Physical distancing and masking during the early days of COVID likely pushed the strain into oblivion.

Influenza A vs. Influenza B. When it comes to flu, there are two types that can cause the seasonal illness many experience in U.S. winters: Influenza A and Influenza B.