When H3N2 virus predominates, we tend to have seasons that are worse flu years, with more hospitalizations from flu and more deaths from influenza, Frieden told reporters in a telephone briefing. In the week ending Nov. 22, he said, 91% of 1,200 samples tested were influenza A -- almost all of them H3N2 -- and 9% were influenza B. Only a small fraction were H1N1 influenza, which has predominated in recent years. But a second factor might foretell a bad flu season, Frieden said: Of the H3N2 samples, only 48% were matched to this years vaccine and the majority of samples were drifted variants with slightly different immunogenic molecules. CDC: Severe Flu Season Possible | Medpage Today
Posted on: Mon, 29 Dec 2014 20:57:08 +0000
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