All U.S. Department of Agriculture-Agricultural Research Service articles
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NewsSwine flu strain has passed from humans to swine nearly 400 times since 2009
A new study of the strain of influenza A responsible for the 2009 H1N1 pandemic shows that the virus has passed from humans to swine about 370 times since 2009, and subsequent circulation in swine has resulted in the evolution of pdm09 variants that then jumped from swine to humans.
