Influenza A Virus, H1N1 Subtype

**Definition:** A subtype of INFLUENZA A VIRUS with the surface proteins hemagglutinin 1 and neuraminidase 1. The H1N1 subtype was responsible for the Spanish flu pandemic of 1918 and 2009 H1N1 pandemic.

**Tree numbers:** - B04.820.480.968.405.400.214

**Synonyms:** - Avian Influenza A(H1N1) Virus - H1N1 - H1N1 Bird Flu Virus - H1N1 Influenza Virus - H1N1 subtype - H1N1 Virus - Influenza A(H1N1) Virus