H1N1 is a new influenza virus first detected in people in the U.S. in April 2009. It was originally referred to as “swine flu” because laboratory tests showed that many of the genes were similar to influenza viruses that normally occur in pigs (swine) in North America. Further study showed that H1N1 is very different from what normally circulates in North American pigs. It has two genes from flu viruses that normally circulate in pigs in Europe and Asia and bird (avian) and human genes. Scientists call this a “quadruple reassortant” virus.
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