From the Departments of Internal Medicine (R.S.G.S., M.L.), Hospital Pharmacy (R.S.G.S., W.J.R.R., P.H.M.K.), and Viroscience (D.G., K.S.S., M.P.G.K., C.H.G., R.D.V.) and the Department of Internal Medicine, Division of Allergy and Clinical Immunology, and Department of Immunology (V.A.S.H.D.), Erasmus University Medical Center, Rotterdam, the Center of Tropical Medicine and Travel Medicine, Department of Infectious Diseases (A.G., H.M.G.G.), and the Department of Experimental Immunology, Amsterdam University Medical Centers, Amsterdam Institute for Infection and Immunity, University of Amsterdam (N.A.K.), Amsterdam, the Department of Internal Medicine and Infectious Diseases (D.F.P.), and the Department of Medical Microbiology and Infection Prevention, University Medical Center Groningen, University of Groningen (A.L.W.H., D.B.), Groningen, the Department of Infectious Diseases, Leiden University Medical Center, Leiden (L.G.V.), and the Center for Infectious Disease Control, National Institute for Public Health and the Environment, Bilthoven (D.B.) - all in the Netherlands.