The influenza virus is a member of the Orthomyxoviridae family of segmented, single-stranded, negatively charged RNA viruses. Three different influenza virus types—A, B, and C—are included in this group. The type A viruses infect both domesticated and wild birds, horses, swine, other mammals, and humans, while the type B and C viruses only affect humans.In the United States, seasonal epidemics of disease are brought on by human influenza A and B viruses almost every winter. An influenza pandemic can be brought on by the spread of a brand-new, radically different influenza virus. Infections with influenza type C are thought to only cause a mild respiratory illness and not epidemics. Each virus subtype has undergone mutation, resulting in a variety of strains with various levels of pathogenicity; some are pathogenic to one species but not to others, and some are pathogenic to several.
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