《英文msh詞典》Influenza B viruses
[入口詞] Influenza B viruses
[主題詞] Influenza B virus
[英文釋義] 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.