作者: Joanna S. Ellis , Adriana Alvarez-Aguero , Vicky Gregory , Yi Pu Lin , A. Hay
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摘要: During the winter of 2001–02, influenza AH1N2 viruses were detected for first time in humans U.K. The H1N2 co-circulated with H3N2 and a very small number H1N1 isolated community hospitalized patients, predominantly from children <15 years age. Characterization indicated that they antigenically genetically homogeneous, deriving hemagglutinin (HA) gene recently circulating A/New Caledonia/20/99-like viruses, whereas other seven genes originated viruses. Retrospective reverse transcription-polymerase chain reaction analysis A H1 during previous identified single virus, March 2001, indicating did not widely circulate before September 2001. reassortment event is estimated to have occurred between 1999 early emergence reinforces need frequent surveillance