Influenza viral antigen

Influenza viral antigens refer to the specific viral proteins that are recognized by the host immune system and are crucial targets for influenza detection, immune response, vaccines, and antiviral drugs[2][5][6]. The major antigens include the envelope glycoproteins hemagglutinin (HA) and neuraminidase (NA), which are used to classify influenza A and B virus subtypes and serve as primary immune targets. HA mediates viral attachment and membrane fusion with host cells, while NA facilitates the release of newly formed virions from infected cells[2][4][6]. Influenza antigens are the basis for seasonal influenza vaccine design; antibodies against HA and NA can neutralize the virus, but rapid antigenic drift and shift enable recurring epidemics and pandemics by allowing escape from existing immunity[2][5][6]. Antiviral drugs, such as neuraminidase inhibitors (e.g., oseltamivir), specifically target these antigens to block viral replication and spread[4][5]. This entry is not specific to a single molecule but a heterogeneous group of structurally distinct viral surface proteins—most notably hemagglutinin and neuraminidase—each of which may individually serve as a drug or immune target[2][5][6].

Other names

Influenza virus antigenInfluenza virus surface antigensInfluenza A antigenInfluenza B antigenHemagglutinin (HA)Neuraminidase (NA)Influenza glycoproteins

Neuraminidase inhibitors block viral release (Oseltamivir, Zanamivir, Peramivir) HA-targeted antibodies neutralize viral entry M2 ion channel inhibitors block viral uncoating (Amantadine, Rimantadine)