Yeping Sun

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In March and early April 2009, a new swine-origin influenza A (H1N1) virus (S-OIV) emerged in Mexico and the United States. The virus spreads worldwide by human to human transmission. Within a few weeks, it reached a pandemic level. The virus is a novel reassorment virus. It contains gene fragments of influenza virus of swine, avian and human emerged from a(More)
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