The 2027 flu vaccine strains are set. Book your 2027 workplace flu clinics now: Registered Nurses run trivalent flu vaccinations for your employees, on your sites, across Australia.
The 2027 flu shot in Australia covers three strains: an A/Missouri/11/2025 (H1N1)pdm09-like virus, an A/Darwin/1454/2025 (H3N2)-like virus and a B/Tokyo/EIS13-175/2025 (B/Victoria lineage)-like virus. The Australian Influenza Vaccine Committee recommended them on 7 October 2026 and the TGA accepted that advice. Two of the three are new for 2027. No release date has been announced; in recent seasons, vaccine has been available for workplace clinics from around late March.
Key facts: flu vaccine 2027
The 2027 vaccine is still trivalent: two influenza A strains and one influenza B (Victoria lineage) strain.
The World Health Organization recommended the 2027 Southern Hemisphere strains on 25 September 2026.
The AIVC matched that recommendation on 7 October 2026, and the TGA accepted it.
The H3N2 and B/Victoria strains are new for 2027. The H1N1 strain is the same as 2026.
Release date: not announced yet. Workplace clinics usually start from late March.
Still to come: ATAGI’s 2027 advice, the list of 2027 vaccines and free-vaccine eligibility.
Vaccines made in eggs and vaccines made in cell culture use slightly different reference viruses for two of the strains. The committee explains that the same virus is not always ideal for both production methods, so viruses with similar properties are chosen for each. Corporate Care’s workplace programs use egg-based vaccines, so the first column below is what your employees receive at our clinics. Our vaccine science page covers how the vaccine is made, approved and handled.
2027 Australian flu vaccine strains (AIVC, 7 October 2026)
Strain
Egg-based vaccines
Cell-based and other vaccines
Change from 2026
Influenza A (H1N1)
A/Missouri/11/2025 (H1N1)pdm09-like
A/Missouri/11/2025 (H1N1)pdm09-like
Same as 2026
Influenza A (H3N2)
A/Darwin/1454/2025 (H3N2)-like
A/Darwin/1415/2025 (H3N2)-like
New for 2027
Influenza B (Victoria lineage)
B/Tokyo/EIS13-175/2025-like
B/Pennsylvania/14/2025-like
New for 2027
What’s new in the 2027 flu vaccine
Two of the three strains are new. The AIVC statement says the 2027 recommendation “differs from the 2026 southern hemisphere with the inclusion of 2 new strains for the A(H3N2) and B Victoria lineage virus component.” The H1N1 strain, A/Missouri/11/2025, carries over unchanged.
The format stays the same. Like 2026, every 2027 vaccine is trivalent, with no B/Yamagata component, because that lineage has not been detected anywhere in the world since March 2020. The AIVC also notes that its 2027 recommendation lines up with the strains the WHO chose for the 2026/27 Northern Hemisphere season, so the Southern Hemisphere vaccine now matches the one recommended for the northern winter.
Three scoops on the rail, three strains in the vial: the 2027 flu vaccine is trivalent again, with two of its three strains refreshed for the new season.
Why the flu vaccine strains change every year
The strains change because influenza viruses change. When the viruses in circulation drift away from the ones in the current vaccine, the reference strains are updated so the vaccine sits closer to what people are likely to meet that winter. Twice a year the WHO brings together experts from its collaborating centres to review data from the Global Influenza Surveillance and Response System. For the 2027 decision, that data showed influenza A(H1N1)pdm09, A(H3N2) and B viruses all circulating between February and August 2026, in different proportions across regions. Our guide to influenza A and B in Australia explains how these virus types differ.
The AIVC then reviewed the epidemiological, antigenic and genetic data of recent viruses circulating in Australia and the Southern Hemisphere, and updated the H3N2 and B/Victoria components. The previous H3N2 update, for 2026, followed the subclade K variant; our explainer on what subclade K is and why the vaccine changed covers that story.
When will the 2027 flu vaccine be available in Australia?
No release date has been announced for the 2027 flu vaccine yet. With the strains settled, manufacturers produce the vaccine, each product must be entered in the Australian Register of Therapeutic Goods, and every batch must be released by the TGA before it can be used. In recent seasons, vaccine has been available for workplace clinics from around late March. Our workplace clinics run from late March to late May, so employees are protected before flu activity usually builds from June. Our guide to when flu season is in Australia covers the season’s timing.
Three announcements for 2027 are still to come, and we will update this page as each one is published:
ATAGI’s advice for 2027. The Australian Technical Advisory Group on Immunisation publishes a statement on using each season’s vaccines. The 2026 statement came out on 27 February 2026.
The list of 2027 vaccines. Which products are registered for 2027, and for which age groups.
Free-vaccine eligibility. Who can get a free vaccine under the National Immunisation Program in 2027.
The case for a workplace program is strong after the last season. In the 12 months to 1 February 2026, 501,928 influenza cases were notified to the National Notifiable Diseases Surveillance System, 2.7 times the yearly average of the previous five years, according to the Australian Centre for Disease Control (opens in new tab). The 2025 season ran unusually long, with a late surge through late spring and early summer.
Like a side that’s a player short, a workplace runs best when everyone’s on the field: the case for whole-of-team flu vaccination, not just the keen few.
When to book your 2027 workplace flu clinics
Strains are set in October and vaccine reaches workplace clinics around late March, so clinic dates get booked in between. Confirming your sites, employee numbers and preferred days early is what secures the dates you want, especially for multi-site programs where several clinics need to land in the same few weeks.
“The whole point is to be protected before flu really picks up in June. The vaccine takes up to about two weeks to give you full protection, so leaving it late is a gamble … book early and you get a real choice of dates and times, because capacity gets tight once the season’s already on top of us.”
— Aitor Aspiazu, Founder & Chief Nurse Consultant
Book your 2027 workplace flu clinics
Tell us your sites and employee numbers. We come back within one business day with a plan for onsite clinics, pharmacy vouchers or both.
How the 2027 flu vaccine is approved for use in Australia
Four steps stand between the WHO’s recommendation and a dose at your workplace, and for 2027 the first two are done. The WHO met from 21 to 24 September 2026 and announced the 2027 Southern Hemisphere recommendation on 25 September. The Australian Influenza Vaccine Committee met on 7 October 2026, weighed that recommendation against what has been circulating here, and advised the TGA. The TGA is the decision-maker and can accept, modify or reject the advice. For 2027 it accepted it.
Two gates remain. Each vaccine must be entered in the Australian Register of Therapeutic Goods, and then comes batch release (opens in new tab): samples from every batch supplied in Australia go to the TGA, and each batch must be released before it can be used for immunisation.
ATAGI advises on who should get the vaccine. Its recommendations are published in the Australian Immunisation Handbook (opens in new tab), which also sets out who is eligible for a free vaccine under the National Immunisation Program.
The WHO’s surveillance points the season down the right track: matching each year’s vaccine strains to the flu actually circulating.
The 2026 flu vaccine: what changed last year
The flu vaccine 2026 brought two changes. First, Australia went back to trivalent vaccines after a decade of quadrivalent ones, dropping the B/Yamagata lineage. ATAGI’s statement on the transition (opens in new tab) said that “TIV may be used exclusively by the 2026 influenza season.” Second, both influenza A strains were updated, with the H3N2 strain moved closer to subclade K, the variant that stretched Australia’s 2025 season well past its usual finish.
For reference, the 2026 egg-based vaccine strains were an A/Missouri/11/2025 (H1N1)pdm09-like virus, an A/Singapore/GP20238/2024 (H3N2)-like virus and a B/Austria/1359417/2021 (B/Victoria lineage)-like virus, as set out in the AIVC recommendation for 2026 (opens in new tab).
“Australia’s switch to Trivalent Influenza Vaccines (TIV) from 2026 reflects what is actually circulating. The B/Yamagata lineage has not been detected globally since March 2020, so the WHO and the Australian Influenza Vaccine Committee dropped it from the seasonal mix. The result is a vaccine focused on the three strains that still pose a threat to Australian workplaces.”
— Aitor Aspiazu, Founder & Chief Nurse Consultant
Aitor on the 2027 vaccine
Every October someone asks me whether next year’s flu shot is different. For 2027 the answer is yes: two of the three strains have been updated, which is exactly what the yearly strain review is for. What doesn’t change is the plan. Book your dates, tell your people why it matters, and get everyone protected before June.
I’ve been a Registered Nurse since 2001 and I founded Corporate Care in 2010. Each year I follow the WHO and AIVC decisions as they come out and make sure our clinics use that season’s vaccine. If you want to talk through your 2027 program, get in touch.
Talk to us about your 2027 workplace flu program
Tell us your employee count, sites and any previous-program participants below. Once the season's vaccine and pricing are confirmed, we come back with pricing within one business day.
Frequently Asked Questions
Egg-based 2027 vaccines in Australia contain an A/Missouri/11/2025 (H1N1)pdm09-like virus, an A/Darwin/1454/2025 (H3N2)-like virus and a B/Tokyo/EIS13-175/2025 (B/Victoria lineage)-like virus. Cell-based and other vaccines use A/Darwin/1415/2025 for H3N2 and B/Pennsylvania/14/2025 for B/Victoria. The AIVC recommended these on 7 October 2026 and the TGA accepted them.
No supply date has been announced yet. Each product must be entered in the Australian Register of Therapeutic Goods, and every batch must be released by the TGA before it can be used. In recent seasons, vaccine has been available for workplace clinics from around late March, and our workplace clinics run from late March to late May.
Yes. Like 2026, every 2027 flu vaccine in Australia is trivalent: two influenza A strains (H1N1 and H3N2) and one influenza B strain from the Victoria lineage. There is no B/Yamagata component, because that lineage has not been detected anywhere in the world since March 2020.
Yes. The Australian Immunisation Handbook recommends a flu vaccine every year for everyone aged 6 months and over. That includes employees who had a flu shot in 2026, and two of the three strains in the 2027 vaccine are new.
The World Health Organization recommends the strains for the Southern Hemisphere each September. The Australian Influenza Vaccine Committee then advises the TGA, which makes the decision; for 2027 the TGA accepted the committee's recommendation. ATAGI advises on who should receive the vaccine.
Confirming your sites, employee numbers and preferred days early secures the dates you want, especially for multi-site programs. Our workplace clinics run from late March to late May. Tell us your sites and employee numbers and we come back within one business day with a plan for onsite clinics, pharmacy vouchers or both.
Corporate Care acknowledges the Traditional Custodians of the lands across Australia on which we work and live. We pay our respects to Elders past and present, and recognise their continuing connection to land, waters and community.
