Swine Flu (H1N1)
Swine flu, or A(H1N1), is no longer a worry to track on its own. It now circulates as a routine seasonal strain — and it's already covered by the single annual flu vaccine Corporate Care delivers to Australian workplaces.
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Swine flu refers to the H1N1 influenza strain that emerged as a pandemic in 2009. The name comes from the virus’s origins in pigs, though it spread between humans through the same routes as seasonal influenza: respiratory droplets from coughing, sneezing, and talking.
H1N1 and seasonal flu vaccination
Since the 2009 pandemic, the H1N1 strain has become part of the regular seasonal influenza landscape. Modern flu vaccines include protection against H1N1 strains as part of their formulation. This means that people who receive the annual flu vaccine are getting coverage for H1N1 along with the other circulating strains selected for that year.
The Australian Immunisation Handbook provides authoritative information on the composition of current flu vaccines and the strains they target.
Symptoms
H1N1 produces symptoms similar to other forms of influenza. As with seasonal flu, symptoms manifest within one to three days of exposure, and recovery can stretch over two weeks. The illness is generally indistinguishable from other influenza strains without laboratory testing.
Workplace vaccination
Because H1N1 is included in the annual flu vaccine, a standard workplace flu vaccination program provides protection against it alongside other influenza strains. There’s no need for a separate vaccine.
Australia’s flu season runs from April to October, with peak activity between June and September. Getting vaccinated early in the season provides the best protection across all included strains, including H1N1.
For more on influenza generally, see what is influenza. For information on potential complications, visit our flu complications page. To organise flu vaccination at your workplace, request a quote.
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
Yes and no. H1N1 is a subtype of influenza A — not a different illness — and since the 2009 pandemic it has circulated as one of the ordinary seasonal flu strains. So while “swine flu” sounds distinct, it’s really one of the seasonal influenza A viruses covered by the annual flu vaccine.
Yes — and it’s the standard annual flu vaccine, not a separate product. Australia’s 2026 flu vaccines are trivalent, containing two influenza A subtypes (one of which is A(H1N1)) plus one influenza B lineage. One yearly flu vaccination covers H1N1 along with the other circulating strains.
Yes. A(H1N1)pdm09 is no longer a pandemic threat tracked on its own — since 2009 it has circulated as a routine seasonal influenza A strain in Australia. Flu activity usually peaks between June and September but can occur year-round, and the A(H1N1) strain is included in the annual flu vaccine.
Swine flu is the common name for influenza A(H1N1)pdm09, an influenza A virus that emerged in the 2009 pandemic and was named for its origins in pigs. It spreads between people through respiratory droplets, the same as other flu, and now circulates routinely as a seasonal influenza A subtype in Australia.
Yes. The A(H1N1) subtype is one of the three strains in Australia’s 2026 trivalent flu vaccine — two influenza A subtypes (including A(H1N1)) plus one influenza B lineage. The specific 2026 A(H1N1) component is the A/Missouri/11/2025 (H1N1)pdm09 strain selected for the Southern Hemisphere season.
There is no standalone “swine flu vaccine.” Protection against H1N1 comes from the standard seasonal influenza vaccine, where A(H1N1) is included as one of the three strains. (The 2009 pandemic used a separate monovalent H1N1 vaccine, but that is historical — today H1N1 is simply part of the routine annual flu vaccine.)
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