1. From the Centers for Disease Control and Prevention (CDC) National Center for Emerging and Zoonotic Infectious Diseases, Fort Collins, CO (P.S.M., N.K.D., S.A.H., M.D., M.F., H.B., R.J.M., M.A., A.M.S., W.-P.T., C.A.N., E.M.M., A.C.B., A.F.H.); and the CDC National Center for Chronic Disease Prevention and Health Promotion (D.O.M.) and the CDC National Center for HIV–AIDS, Viral Hepatitis, STD, and TB Prevention (J.T.B.) — both in Atlanta.