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Why is H1N1 Vaccine a separate vaccination?

April 26, 2017h1n1 separate vaccination vaccine

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Why is H1N1 Vaccine a separate vaccination?

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10 Posted

The three strains of influenza that are put into the usual seasonal vaccine are chosen in February in order to start production in time for the fall. In 2009, the H1N1 (swine) strain was not isolated until April, after seasonal vaccine production had started.