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Peter C. Doherty, Dept of Microbiology and Immunology University of Melbourne, and St Jude Children s Research Hospita

Negative sense RNA virusNo proof-reading during replicationSegmented genomesHighly variable16 HA and 9 NA subtypes. Influenza Virus. N, NA the neuraminidase that gets the virus away from the cell. H, HA the hemagglutinin molecule that gets the virus into the cell. NA. HA. Influenza A viruses are natural infections of aquatic birds .

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Peter C. Doherty, Dept of Microbiology and Immunology University of Melbourne, and St Jude Children s Research Hospita

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    2. Negative sense RNA virus No proof-reading during replication Segmented genomes Highly variable 16 HA and 9 NA subtypes

    3. Rapid spread of a “seasonal” Influenza A virus

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