What is h1n1 swine influenza

Influenza A (H1N1) virus is a subtype of influenza A virus. It is the most common cause of influenza (flu) in humans. Some stains of H1N1 virus are active in animals like pigs(swine influenza) and in birds(avian flu).

TAGS: virus, flu, H1N1, seasonal flu, symptoms, influenza, infected, pigs, swine flu, cough, illness, flu virus, influenza virus, fever, CDC, vaccine, swine influenza, flu viruses, humans, influenza viruses

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