Influenza A virus is a member of the Orthomyxoviridae family and is one of the primary agents responsible for seasonal influenza, commonly known as the flu. This virus is characterized by its high mutation rate and its ability to cause pandemics. Influenza A viruses are classified based on two proteins on their surface: hemagglutinin (H) and neuraminidase (N). Different combinations of these proteins result in various subtypes such as H1N1 and H3N2.
