Author Contributions: Dr Lin had full access to all of the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis.
Study concept and design: Lin, Hota, Woeltje, Stevenson, Weinstein, Trick.
Acquisition of data: Lin, Hota, Khan, Borlawsky, Doherty.
Analysis and interpretation of data: Lin, Hota, Weinstein, Trick.
Drafting of the manuscript: Lin, Trick.
Critical revision of the manuscript for important intellectual content: Lin, Hota, Khan, Woeltje, Borlawsky, Doherty, Stevenson, Weinstein, Trick.
Statistical analysis: Lin, Trick.
Obtained funding: Woeltje, Stevenson, Weinstein.
Administrative, technical, or material support: Lin, Hota, Khan, Borlawsky, Doherty.
Study supervision: Lin, Hota, Weinstein, Trick.
Financial Disclosures: None reported.
Funding/Support: This study was funded by CDC Cooperative Agreements U01-CI000327, U01-CI000328, and U01-CI000333 from the CDC Prevention Epicenter Grants.
Role of the Sponsor: The sponsors had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; and preparation, review, or approval of the manuscript.
Previous Presentation: Presented in part at the 18th Annual Scientific Meeting of the Society for Healthcare Epidemiology of America, Orlando, Florida, April 6, 2008 (Abstract 346).
Additional Contributions: We thank the infection preventionists who contributed their surveillance data to the analysis.