Influenza A Virus, H1N1 Subtype |
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| H1N1 Viruses; Virus, H1N1; Viruses, H1N1 | |
| A subtype of INFLUENZA A VIRUS comprised of the surface proteins hemagglutinin 1 and neuraminidase 1. The H1N1 subtype was responsible for the Spanish flu pandemic of 1918 and for swine flu. | |