SAT and ACT Score Requirements for Vanderbilt University, Nashville, Tennessee.
Type A flu is the most common type of influenza. Type A influenza symptoms include respiratory symptoms like coughing and sneezing and a runny nose, as well as influenza symptoms like headache, muscle aches, and fever. Flu symptoms are similar to the symptoms of a cold, but fever is rare with a cold and common with the flu.
Influenza A viruses are divided into subtypes on the basis of two proteins on the surface of the virus: hemagglutinin (HA) and neuraminidase (NA) . For example, an âH7N2 virusâ designates an influenza A virus subtype that has an HA 7 protein and an NA 2 protein.