Influenza Vaccine

Patent Granted The influenza vaccination is an annual vaccination using a vaccine specific for a given year to protect against the highly variable influenza virus.[1] Each seasonal influenza vaccine contains antigens representing three (trivalent vaccine) or four (quadrivalent vaccine) influenza virus strains: one influenza type A subtype H1N1 virus strain, one influenza type A subtype H3N2 virus strain, and either one or two influenza type B virus strains.[2] Influenza vaccines may be administered as an injection, also known as a flu shot, or as a nasal spray.