Potential conflicts of interest. A. M. M. received a research grant from Merck, and reports grants or contracts from the Agency for Healthcare Research and Quality (AHRQ), the National Institutes of Health (NIH), and the CDC. A. D. H. served in a consultant role for UpToDate and an advisory role for Innoviva and received funding for an investigator-initiated grant from Merck. S. S. H. is conducting studies in which participating nursing homes and hospitalized patients receive contributed antiseptic or environmental cleaning products from Medline and Xttrium, and also reports grants or contracts paid to institution from AHRQ, CDC, and NIH. J. M. conducted a clinical trial in which participating hospitals received contributed product from Sage Products, Inc. K. A. reports nonfinancial interests from the American Journal of Infection Control editorial board. D. P. C. reports serving as the Editor-in-Chief of Infection Control and Hospital Epidemiology, the journal in which the Compendium is published; the author's institution also receives financial support from the Society for Healthcare Epidemiology of America (SHEA) to support the author's work in this role. L. L. M. reports a role as principal investigator on an AHRQ-funded contract to implement evidence-based best practices for methicillin-resistant Staphylococcus aureus prevention. K. J. P. reports an NIH grant. D. Y. reports an unpaid role as member of the Board of Trustees and President of SHEA. All other authors report no potential conflicts. All authors have submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest. Conflicts that the editors consider relevant to the content of the manuscript have been disclosed.