It was previously believed that influenza pandemics occurred at 10- to 14-yr intervals, but it has been over 30 years since H3N2 viruses appeared. Viruses were first isolated in Hong Kong in July 1968. Widespread disease with elevated excess mortality was noticed within the United States throughout the winter of 1968-1969. In case you loved this informative article and you want to receive details with regards to sialic acid manufacturers i implore you to visit our own web-page. Attack rates had been highest (40%) among 10- to 14year-previous children.
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