influenza A vaccine + influenza B vaccine

The influenza A vaccine + influenza B vaccine refers to combination influenza vaccines that include antigens from both influenza A virus subtypes and influenza B viruses. These vaccines are inactivated (killed virus) or recombinant protein vaccines engineered to induce immunity and prevent infection from circulating seasonal influenza A and B viruses. They work by stimulating the production of virus-neutralizing antibodies, targeting the viral hemagglutinin (HA) proteins of both influenza A and B strains. Commonly, they are formulated as trivalent (containing two A strains and one B strain) or quadrivalent (containing two A and two B strains) vaccines. Their primary use is the prevention of seasonal influenza in children and adults.