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There's one vaccine composition for the southern hemisphere and one for the northern hemisphere each year. The WHO publishes the composition recommendations. For example, the composition for the 2019/2020 northern hemisphere winter season was: an A/Brisbane/02/2018 (H1N1)pdm09-like virus; an A/Kansas/14/2017 (H3N2)-like virus; a B/Colorado/06/2017-like ...


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