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Novel Hybrid Viruses Caused Major Mid-Century Influenza Epidemics
Bird Flu / Avian Flu Reassortment of the influenza A virus occurs frequently throughout its evolutionary history, according to a new study published February 29 in the open-access journal PLoS Pathogens. Researchers at Pennsylvania State University and the National Institute of Health used an evolutionary analysis of influenza viruses sampled from 1918 - 2005 to investigate the influenza viruses that cause seasonal epidemics in humans, particularly those where mortality was unusually high.

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