2025 Flu Strains

Influenza (Flu) viruses are constantly evolving and changing. The annual vaccine strains need to change to best match the currently circulating virus strains.

The World Health Organisation (WHO) recommends strains for our Southern Hemisphere vaccine annually, based on international surveillance of circulating viruses. Australasian experts then review our local data and epidemiology and agree on which four strains will be in the upcoming vaccine.

The vaccines we use are made at the Seqirus Laboratory in Melbourne, Australia. They are kept at between 2 and 8 degrees Celsius from the time of manufacture until they are administered into your arm, including throughout transportation and storage.

In 2025, there is ONE change to the Influenza A H3N2 strain.  The other 3 strains in the quadrivalent vaccine remain the same.

The Quadrivalent vaccines for 2025 will be based on the following strains:

Egg-based vaccines

A/Victoria/4897/2022 (H1N1)pdm09-like virus; A/Croatia/10136RV/2023 (H3N2)-like virus; B/Austria/1359417/2021 (B/Victoria lineage)-like virus; and
B/Phuket/3073/2013 (B/Yamagata lineage)-like virus.

Cell culture, recombinant protein, or nucleic acid – based vaccines

A/Wisconsin/67/2022 (H1N1)pdm09-like virus;
A/District of Columbia/27/2023 (H3N2)-like virus;
B/Austria/1359417/2021 (B/Victoria lineage)-like virus; and
B/Phuket/3073/2013 (B/Yamagata lineage)-like virus.

The WHO recommend different strains for cell-based flu vaccine manufacture compared to egg-based manufacture.  This is because they select strains best suited to the production method.

Influenza viruses may not grow equally well in the egg- and cell-based vaccine production systems.  This means the WHO can recommend different viruses with similar properties for each of the two production systems.

The name of the strain comes from the site where the virus was first isolated.

 

 

Afluria Quad Junior

  • For 6 months – 36 months
  • See your GP for this vaccine

Afluria Quad (Egg based)

  • For 3 years and over
  • This is the vaccine we provide to our clients
Fluad Quad

  • For 65 years and older
  • Privately funded & available through your GP

Enquire Now

  • 021 378212
  • info@yourhealthnz.co.nz
  • Hamilton 3281
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