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A H5N1 vaccine is an influenza vaccine intended to provide immunization to influenza A virus subtype H5N1.
Vaccines have been formulated against several of the avian H5N1 influenza varieties. Vaccination of poultry against the H5N1 epizootic is widespread in certain countries. Some vaccines also exist for use in humans, and others are in testing, but none have been made available to civilian populations, nor produced in quantities sufficient to protect more than a tiny fraction of the Earth's population in the event of an H5N1 pandemic.
In January 2020, the U.S. Food and Drug Administration approved Audenz, an adjuvanted influenza A monovalent vaccine. Audenz is a vaccine indicated for active immunization for the prevention of disease caused by the influenza A virus H5N1 subtype contained in the vaccine. Audenz is approved for use in persons six months of age and older at increased risk of exposure to the influenza A virus H5N1 subtype contained in the vaccine.
Some older, egg-based H5N1 vaccines for humans that have been licensed are: