What types of influenza vaccines are available in Europe?
In Europe, all available influenza vaccines are inactivated vaccines made of killed virus. Some vaccines that are recommended for the elderly contain an adjuvant (MF59). Vaccines are produced in embryonated hens’ eggs and contain three influenza virus strains: an A(H3N2), an A(H1N1) and a type B strain, which correspond to the currently circulating types and subtypes of influenza viruses. The vaccine composition is updated on a yearly basis following the recommendations made by the World Health Organization (WHO). This is based on the comparative analysis, by the four WHO Collaborating Centres on influenza (London, Atlanta, Melbourne and Tokyo), of the viruses circulating around the world collected by the global network of laboratories.