[1] Inst Pasteur, Agence Med Prevent, F-75724 Paris 15, France
[2] Ctr Muraz, Agence Med Prevent, Bobo Dioulasso 01, Burkina Faso
[3] Univ Hosp RWTH Aachen, Dept Med Microbiol, German Natl Reference Ctr Streptococci, D-52074 Aachen, Germany
[4] Minist Hlth Togo, Div Epidemiol, Lome, Togo