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Euro Surveill. 2016;21(4). doi: 10.2807/1560-7917.ES.2016.21.4.30118.

Differential age susceptibility to influenza B/Victoria lineage viruses in the 2015 Australian influenza season.

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WHO Collaborating Centre for Reference and Research on Influenza, VIDRL, Doherty Institute, Melbourne, Australia.


Influenza B viruses make up an important part of the burden from seasonal influenza globally. The 2015 season in Australia saw an unusual predominance of influenza B with a distinctive switch during the season from B/Yamagata/16/88 lineage viruses to B/Victoria/2/87 lineage viruses. We also noted significant differences in the age groups infected by the different B lineages, with B/Victoria infecting a younger population than B/Yamagata, that could not be explained by potential prior exposure.


epidemiology; influenza; laboratory; laboratory surveillance; molecular methods; public health policy; statistics; surveillance; vaccines and immunisation; viral infections

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