New variants and age shift to high fatality groups contribute to severe successive waves in the 2009 influenza pandemic in Taiwan.

PLoS One · 2011 · PMC3227656 · PMID 22140569

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may be significantno p-value reported

Although only few of these residues had been reported [27] , [28] , their undetermined effects on virus pathogenicity may be significant.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.