Contact: Anne A. Oplinger
aoplinger@niaid.nih.gov
301-402-1663
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.

Credit: NIAID

Usage Restrictions: None

Related news release: Dynasty: Influenza virus in 1918 and today