All authors have completed and submitted the International Committee of Medical Journal Editors form for disclosure of potential conflicts of interest. Elizabeth M. Dufort reports serving as a public health consultant with Hutton Health Consulting. Ruth Lynfield is an Associate Editor for the American Academy of Pediatrics Red Book (fees received were donated to the Minnesota Department of Health); she also reports receipt of funding from the Infectious Diseases Society of America’s Program Committee for ID Week for attendance at ID Week conferences, receipt of funding from the Council of State and Territorial Epidemiologists (CSTE) for attendance at CSTE meetings, receipt of funding from the National Foundation for Infectious Diseases (NFID) for attendance at NFID meetings, and membership on the executive boards for CSTE and NFID. No other potential conflicts of interest were disclosed.