Affiliation: | Centers for Disease Control and Prevention, Fort Collins, Colorado, USA (C. Sackal, M. Kosoy, K. Van Wyk, N. Zeidner);University of Antwerp, Antwerp, Belgium ( A. Laudisoit); University of Liege, Liege, Belgium (A. Laudisoit);Centers for Disease Control and Prevention, Atlanta, Georgia, USA (R. Massung, M.E. Eremeeva, S.E. Karpathy);Etubics Corporation, Seattle, Washington, USA (E. Gabitzsch) |