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Influenza About The Disease

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Influenza is caused by influenza viruses, which are RNA viruses of the family Orthomyxoviridae . There are three basic types of influenza viruses: A, B, and C. Type A is further subtyped by the surface antigens hemagglutinin (H) and neuraminidase (N). Influenza A causes moderate to severe illness and affects all age groups. Influenza A infects animals such as birds and pigs as well as humans, and it has been associated with pandemics. Influenza B affects only humans, primarily children, and generally causes milder disease. Influenza B is more genetically stable than type A, with less antigenic drift. Most cases of influenza C are sub-clinical or in the nature of a mild upper respiratory tract infection, and influenza C is rarely identified in human disease.

Source : www.mass.gov | Download Link : www.mass.gov

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