H1n1 meaning

āchwunenwun
Any of various strains of influenza virus including those that most commonly cause influenza in humans; specif., a pandemic strain originating in North America in 2009 and containing genes from swine, bird, and human influenza viruses.
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(medicine) A strain of influenza, the most common cause of flu in humans; also the strain responsible for swine flu.
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Origin of h1n1