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*UPDATE* Quadrivalent Vaccine NOW AVAILABLE
Each year the World Health Organization (WHO) puts forward its recommendations for the composition of the influenza virus for the Southern Hemisphere influenza season. This year this includes two influenza A strains and one influenza B strain.
Over the past 10 years, these three recommended strains have accounted for an average of 94% of all influenza cases reported in Australia.
For the 2016 flu season, some manufacturers have chosen to include a fourth strain – an additional influenza B strain.
Trivalent, which includes the three strains as recommended by WHO:
Quadrivalent, which includes the three strains as above, plus the additional influenza B strain:
Manufacturers choosing to produce a Quadrivalent vaccine have made their decision based on ongoing surveillance of circulating virus and assessment of suitable candidate vaccine strains. This, ultimately means that the Quadrivalent vaccine is not yet available and the estimated earliest available release date is mid-April 2016.
Evidence suggests there is already cases of flu circulating in Australia.
To optimise protection, it is recommended that people seek vaccination as soon as the vaccine becomes available, typically February/March.
Quadrivalent vaccine is not yet available, Trivalent vaccine is available now.
Article references:
Department of Health: Therapeutic Goods Administration. Influenza vaccine: the annual Southern Hemisphere influenza vaccine production and the regulatory approval timeline.
Department of Health. OzFlu: Australian Influenza Surveillance Report No. 8. September 2015.
World Health Organisation. Recommended composition of influenza virus vaccines for use in the 2015 southern hemisphere influenza season. September 2014.
World Health Organisation: Flu Net Data. Available at: http://www.who.int/influenza/gisrs_laboratory/updates/en/ Accessed October 2015.
Australian Technical Advisory Group on Immunisation (ATAGI) Statement. Clinical advice for immunisation providers regarding the administration of 2015 seasonal influenza vaccines.
CDC. Prevention and Control of Influenza with Vaccines: Recommendations of the Advisory Committee on Immunization Practices, United States, 2015–16 Influenza Season. August 2015.
NHMRC. The Australian Immunisation Handbook. 10th Edition (2013).
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