After waiting an extra month to decide on the H3N2 strain, World Health Organization (WHO) vaccine advisors today finalized their recommendations on strains to include in the Northern Hemisphere 2019-20 flu vaccines.

Their H3N2 recommendation—an A/Kansas/14/2017-like virus—reflects a change from the current Northern Hemisphere vaccine and is not a component of the Southern Hemisphere 2019 flu vaccines, either.

New subclade rising sharply in US, elsewhere

Credit CDC

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