Genetic Relationships Among Human and Swine Influenza Viruses, 1918-2009 (IMAGE)

NIH/National Institute of Allergy and Infectious Diseases

Genetic Relationships Among Human and Swine Influenza Viruses, 1918-2009

Caption

Red arrows indicate human influenza virus lineages, black arrows swine influenza virus lineages, and gray arrows exportation of one or more genes from the avian influenza A virus gene pool. Horizontal bars shown inside the virus represent each of the eight virus genes, abbreviated PB2, PB1, PA, HA, NP, NA, M and NS.

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NIAID

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