Assessing secondary attack rates among household contacts at the beginning of the influenza A (H1N1) pandemic in Ontario, Canada, April-June 2009: a prospective, observational study.
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BMC Public Health. 2011 Apr 14;11:234. doi: 10.1186/1471-2458-11-234.
BMC Public Health. 2011.
PMID: 21492445
Free PMC article.