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TYPES AND SUBTYPES OF THE INFLUENZA VIRUS

Learn about the types and subtypes of the influenza virus, including A, B, and C, their characteristics, and nomenclature. Understand the classification within the Orthomyxoviridae family.

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TYPES AND SUBTYPES OF THE INFLUENZA VIRUS

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  1. TYPES AND SUBTYPES OF THE INFLUENZA VIRUS

  2. Classification ORTHOMYXOVIRIDAE Influenza virus Influenza C virus Type A Type B Type C RNA virus Family: Genus: Types: Kingsbury DW. In: Fields BN et al., eds. Virology. 2nd Edn. New York: Raven Press; 1990: 1076–87. Photo courtesy of Linda Stannard, University of Cape Town, South Africa.

  3. Influenza subgroups • Influenza A • highly infective • infects many species • causes widespread epidemics • Influenza B • found only in humans • capable of producing severe disease • causes regional epidemics • Influenza C • causes mild disease • humans are natural hosts, but isolates also found in pigs • does not cause epidemics

  4. The virus nomenclature Classification of the human influenza viruses For example:A / Beijing / 32 / 92 (H3N2) A virus type, here A Beijing place where the strain was isolated 32 strain number 92 year of first isolation H3N2 subtypes H3 and N2 virus type, here H3N2

  5. By courtesy of APACIAsia-Pacific Advisory Committee on influenzawww.apaci-flu.com

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