Journal
INFLUENZA AND OTHER RESPIRATORY VIRUSES
Volume 5, Issue 6, Pages R563-R567Publisher
WILEY-BLACKWELL
DOI: 10.1111/j.1750-2659.2011.00282.x
Keywords
Adults; influenza subtypes; pandemic H1N1; Singapore
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Peaks of influenza activity in July 2009 and January 2010 were >90% pandemic H1N1 (pH1N1), but by May 2010, H3N2 predominated in hospital attendances (46.5%, versus 38.9% pH1N1); H3N2 hospital attendances were older (72.9% aged >= 60 years versus 13.5% for pH1N1), but the age-stratified proportions admitted for pneumonia vertical bar were similar. As at the end of the third epidemic wave in Singapore, pH1N1 cases in hospital attendances were still markedly younger than cases of H3N2 or influenza B, with little evidence for any changes in severity.
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