Charles B. Beard* , Jane L. Carter*, Scott P. Keely†, Laurence Huang‡, Norman J. Pieniazek*, Iaci N.S. Moura*, Jacquelin M. Roberts*, Allen W. Hightower*, Michelle S. Bens*, Amanda R. Freeman*, Sherline Lee*, James R. Stringer†, Jeffrey S. Duchin*, Carlos del Rio§, David Rimland§¶, Robert P. Baughman#, Deborah A. Levy*, Vance J. Dietz*, Paul Simon*, and Thomas R. Navin*

Author affiliations: *Centers for Disease Control and Prevention, Atlanta, Georgia, USA; †University of Cincinnati College of Medicine, Cincinnati, Ohio, USA; ‡University of California, San Francisco General Hospital, San Francisco, California, USA; §Emory University School of Medicine, Division of Infectious Diseases, Atlanta, Georgia, USA; ¶Veterans' Affairs Medical Center, Atlanta, Georgia, USA; #University of Cincinnati College of Medicine, Cincinnati, Ohio, USA