6 October 2025

Key points

  • There are three kinds of flu vaccine in use: the traditional inactivated vaccine, the nasal spray, and the recombinant vaccine added in 2025.
  • The recombinant vaccine is made using recombinant technology; the benefit is stronger and longer-lasting protection.
  • Its antigen content is three times that of the traditional vaccine. Against the influenza A H3 strain the antibody level is 200% higher, and against H1 it is 50% higher.
  • This year’s government vaccination subsidy scheme has added the recombinant flu vaccine, and it is the one residents of care homes for the elderly receive.
  • The ages differ: the traditional flu vaccine can be given from 6 months, while the recombinant vaccine needs 18 years or above. The recombinant vaccine contains no egg, so people allergic to egg yolk or egg white can have it.