Genetic evolution of H7N9 virus in China, 2013
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Genetic evolution of H7N9 virus in China, 2013

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English
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  • Corporate Authors:
    National Center for Immunization and Respiratory Diseases (U.S.)
  • Description:
    The eight genes of the H7N9 virus are closely related to avian influenza viruses found in domestic ducks, wild birds and domestic poultry in Asia. The virus likely emerged from “reassortment,” a process in which two or more influenza viruses co-infect a single host and exchange genes. This can result in the creation of a new influenza virus. Experts think multiple reassortment events led to the creation of the H7N9 virus. These events may have occurred in habitats shared by wild and domestic birds and/or in live bird/poultry markets, where different species of birds are bought and sold for food. As the above diagram shows, the H7N9 virus likely obtained its HA (hemagglutinin) gene from domestic ducks, its NA (neuraminidase) gene from wild birds, and its six remaining genes from multiple related H9N2 influenza viruses in domestic poultry.

    Publication date from document properties.

    h7n9-reassortment-diagram.pdf

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  • Place as Subject:
    China
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