Jeffrey C. Hageman* , Timothy M. Uyeki*, John S. Francis†, Daniel B. Jernigan*, J. Gary Wheeler‡, Carolyn B. Bridges*, Stephen J. Barenkamp§, Dawn M. Sievert¶, Arjun Srinivasan*, Meg C. Doherty†, Linda K. McDougal*, George E. Killgore*, Uri A. Lopatin#, Rebecca Coffman**, J. Kathryn MacDonald††, Sigrid K. McAllister*, Gregory E. Fosheim*, Jean B. Patel*, and L. Clifford McDonald*

Author affiliations: *Centers for Disease Control and Prevention, Atlanta, Georgia, USA; †Johns Hopkins Medical Institutions, Baltimore, Maryland, USA; ‡University of Arkansas for Medical Sciences College of Medicine, Little Rock, Arkansas, USA; §Saint Louis University School of Medicine, Saint Louis, Missouri, USA; ¶Michigan Department of Community Health, Lansing, Michigan, USA; #National Institutes of Health, Bethesda, Maryland, USA; **Oklahoma State Department of Health, Oklahoma City, Oklahoma, USA; ††Washington State Department of Health, Shoreline, Washington, USA