A handful of subtypes of avian influenza A viruses are known to occasionally infect humans: H5, H6, H7, H9 and H10. Flu spreads between birds through contact with infected saliva, respiratory ...

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.

Two types of influenza viruses are responsible for seasonal flu outbreaks: Influenza A and B. Influenza A accounts for around 75 percent of all cases and tends to cause more severe illness in adults.

“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?

Influenza activity is elevated across most of the country, with at least 5.3 million illnesses, 63,000 hospitalizations, and 2,700 deaths from flu so far this season, according to the CDC.

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.

A rash is not a common symptom of the flu, but it can sometimes occur. Learn more about a flu rash and other possible causes of a rash here.