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Avian Influenza

Evolution of H5N1 avian influenza viruses in Asia outlined

Published in TB and Outbreaks Week, November 22nd, 2005

Scientists outline the evolution of H5N1 avian influenza viruses in Asia in a recent issue of Emerging Infectious Diseases.

"An outbreak of highly pathogenic avian influenza A (H5N1) has recently spread to poultry in nine Asian countries. H5N1 infections have caused {{>=}}52 human deaths in Vietnam, Thailand, and Cambodia from January 2004 to April 2005. Genomic analyses of H5N1 isolates from birds and humans showed two distinct clades with a nonoverlapping geographic distribution. All the viral genes were of avian influenza origin, which indicates absence of reassortment with human influenza viruses," investigators in the United States report.

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