[1] Inst Pasteur, Anthropol & Ecol Dis Emergence Unit, 25-28 Rue Dr Roux, F-75015 Paris, France
[2] Inst Pasteur, Emerging Dis Epidemiol Unit, 25-28 Rue Dr Roux, F-75015 Paris, France
[3] Univ Oxford, Radcliffe Observ Quarter, Nuffield Dept Primary Care Hlth Sci, Radcliffe Primary Care Bldg, Oxford, England
[4] Univ Antwerp, Dept Family Med & Populat Hlth, Doornstr 331, B-2610 Antwerp, Belgium
[5] Univ Antwerp, Vaccine & Infect Dis Inst, Lab Med Microbiol, Univ Pl 1, B-2610 Antwerp, Belgium