This is intended for HCPs practising in Great Britain (England, Scotland and Wales) only.

How Supemtek is manufactured

Recombinant technology eliminates the possibility of adaptation or mutation by replicating only the haemagglutinin (HA) antigen, directly from a genetic sequence. The resulting antigens are an exact genetic match to the target strain.2,3

In the production of Supemtek, the HA antigen DNA for each World Health Organization (WHO)-recommended influenza strain is combined with host cell DNA.1,3 Because only the DNA for each influenza antigen is used, there is no live virus replication during the recombinant process.3

Supemtek contains 3x more HA antigen (45 μg versus 15 μg) per strain, compared with cell- and egg-based standard-dose quadrivalent influenza vaccines.2

Discover more about how Supemtek, our recombinant flu vaccine, is manufactured: 

Recombinant technology generates HA antigens that are an exact genetic match to the target strains2,3

WHO-selected strain identification

The antigen for each strain is transcribed into DNA sequence

HA gene DNA is inserted into vector for recombination with baculovirus for expression

Baculovirus is imported into host cell

Host cell rapidly produces HA antigen

HA antigens are collected and purified

Recombinant influenza formulation put into influenza vaccine

This eliminates the possibility of adaptation or mutation.2,3

According to evidence gathered over previous flu seasons, influenza vaccine effectiveness against A/H3N2 influenza viruses may have been lower than against other influenza strains. This may be due to egg adaptation, resulting in an antigenic mismatch between the vaccine strain and strains circulating during a particular influenza season.5–8

    CVV, Candidate Vaccine Virus; HA, haemagglutinin; WHO, World Health Organization.

    1. Supemtek Summary of Product Characteristics. Available at: (Accessed May 2023).
    2. Dunkle LM, et al. N Engl J Med. 2017;376:2427–36.
    3. Centers for Disease Control and Prevention (CDC). How influenza (flu) vaccines are made. (Accessed May 2023).
    4. Harding AT and Heaton NS. Vaccines. 2018;6:19.
    5. Skowronski DM, et al. PLoS ONE. 2014;9:e92153
    6. Zost SJ, et al. Proc Natl Acad Sci USA. 2017;114:12578–83.
    7. Widjaja L, et al. Virology. 2006;350:137–45.
    8. Flannery B, et al. Morb Mortal Wkly Rep. 2018;67:180–5.

MAT-XU-2301386 (v1.0)
Date of preparation: May 2023