1. From the Centers for Disease Control and Prevention, Atlanta (J.K.P., M.G.E., M.C.T., P.D., K.O., J.E.G., C.A.B., E.S., R.T., C.A.G., J.S.S., W.A.B., Z.P.W., M.E.N., A.R.H.); the Mississippi State Department of Health, Jackson (J.H., C.B., G.A., D.W., K.T., P.B.); the Arizona Department of Health Services, Phoenix (C.A.B.); and the Louisiana Department of Health, Baton Rouge (T.S., G.B.).