Jennifer H. McQuistonCenters for Disease Control and Prevention, National Center for Infectious Diseases, Division of Viral and Rickettsial Diseases, Viral and Rickettsial Zoonoses Branch, 1600 Clifton Rd, Mailstop G-13, Atlanta, GA 30333.
William L. NicholsonCenters for Disease Control and Prevention, National Center for Infectious Diseases, Division of Viral and Rickettsial Diseases, Viral and Rickettsial Zoonoses Branch, 1600 Clifton Rd, Mailstop G-13, Atlanta, GA 30333.