Accepted for Publication: December 12, 2011.
Published Online: February 27, 2012. doi:10.1001/archinternmed.2011.2038
Author Contributions: Mr Campitelli and Dr Kwong had full access to all the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis. Study concept and design: Wong, Campitelli, Stukel, and Kwong. Acquisition of data: Campitelli. Analysis and interpretation of data: Wong, Campitelli, Stukel, and Kwong. Drafting of the manuscript: Wong and Campitelli. Critical revision of the manuscript for important intellectual content: Wong, Campitelli, Stukel, and Kwong. Statistical analysis: Wong, Campitelli, and Stukel. Obtained funding: Kwong. Study supervision: Stukel and Kwong.
Financial Disclosure: None reported.
Funding/Support: This study was supported by an operating grant from the Canadian Institutes of Health Research and by the Institute for Clinical Evaluative Sciences (ICES), which is funded by an annual grant from the Ontario Ministry of Health and Long-Term Care (MOHLTC).
Role of the Sponsors: The sponsors had no role in the design and conduct of the study; in the collection, management, analysis, and interpretation of the data; or in the preparation, review, or approval of the manuscript.
Disclaimer: The opinions, results, and conclusions reported in this article are those of the authors and are independent from the funding sources. No endorsement by ICES or the Ontario MOHLTC is intended or should be inferred.
Additional Contributions: The sentinel laboratories participating in the Respiratory Virus Detection Surveillance System and the FluWatch team at the Public Health Agency of Canada provided the viral surveillance data.