“Swine flu” strain has passed from humans to swine nearly 400 times since 2009 (IMAGE)

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“Swine flu” strain has passed from humans to swine nearly 400 times since 2009

Caption

Dr. Giovana Ciacci Zanella swabbing a pig snout to gather samples to test for influenza A virus

Credit

M.Marti and A.Grimes, USDA (CC-BY 2.0, https://creativecommons.org/licenses/by/2.0/

Usage Restrictions

Credit must be given to the creator.

License

CC BY

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