50 likes | 60 Views
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.
E N D
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.
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
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
By courtesy of APACIAsia-Pacific Advisory Committee on influenzawww.apaci-flu.com