Canadian Medical Guide > Organisms > Viruses > RNA Viruses > Orthomyxoviridae > Influenzavirus B > Influenza B virus Terms and Definitions

Influenza B virus

Medical Definition:	Species of the genus INFLUENZAVIRUS B that cause INFLUENZA and other diseases primarily in humans. Antigenic variation is less extensive than in type A viruses (INFLUENZA A VIRUS) and consequently there is no basis for distinct subtypes or variants. Epidemics are less likely than with INFLUENZA A VIRUS and there have been no pandemics. Previously only found in humans, Influenza B virus has been isolated from seals which may constitute the animal reservoir from which humans are exposed.
Guide Notes:	infection: coord IM with ORTHOMYXOVIRIDAE INFECTIONS (IM) or with INFLUENZA (IM); INFLUENZAVIRUS B is also available
Previously Indexed:	Orthomyxoviridae (1981-1984)

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