‘Swine flu’ strain has passed from humans to swine nearly 400 times since 2009, study finds
Dr. Giovana Ciacci Zanella swabbing a pig snout to gather samples to test for influenza A virus. Credit: M.Marti and ...
Read moreDr. Giovana Ciacci Zanella swabbing a pig snout to gather samples to test for influenza A virus. Credit: M.Marti and ...
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