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TYPES AND SUBTYPES OF THE INFLUENZA VIRUS

TYPES AND SUBTYPES OF THE INFLUENZA VIRUS. 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.

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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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