The swine flu virus can reach deep into the respiratory system and even as far as the intestines — findings which could explain why the disease's symptoms are different from those of seasonal flu. Two separate groups have been using ferrets to investigate how harmful A(H1N1) influenza virus is and how easily it is transmitted. One of the studies was by Terrence Tumpey at the Centers for Disease Control and Prevention in Atlanta, Georgia, and his colleagues, and is published in Science1. (source: nature.com)
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