1. From the Bernhard Nocht Institute for Tropical Medicine, National Reference Center for Tropical Infectious Diseases, Hamburg (C.D., S.G., M.P., K.G., S.K., S.M., S.V., H.S.); the Institute of Medical Virology (W.P., H.R., A.B., J.C., M.S., H.W.D.) and the Medical Clinic III (H.-R.B., V.R.), Johann Wolfgang Goethe University, Frankfurt am Main; and the Institute of Virology, Philipps University, Marburg (S.B., L.K., M.E., H.-D.K.) — all in Germany; the Pasteur Institute, Molecular Genetics of Respiratory...