Influvac® is a sub-unit vaccine produced and marketed by Solvay Biologicals, one of the leading influenza vaccine companies in the world. Influvac® contains inactivated purified surface fragments (sub-units) from the three different strains of the influenza virus that are selected and distributed by the World Health Organization, on the basis of their latest recommendations.

The sub-units consist of the surface antigens haemagglutinin and neuraminidase of the influenza virus and only these parts of the virus are needed for effective protection against influenza. The sub-unit influenza vaccine Influvac® has been on the market since the early nineteen-eighties.