[1] BIOMEDICUM, DEPT BACTERIOL & EPIZOOTOL, UPPSALA, SWEDEN
[2] BLACK LION HOSP, DEPT PEDIAT & CHILD HLTH, ETHIO SWEDISH PEDIAT CLIN, ADDIS ABABA, ETHIOPIA
[3] KAROLINSKA INST, ST GORANS CHILDRENS HOSP, DEPT PEDIAT, S-11281 STOCKHOLM, SWEDEN
[4] KAROLINSKA INST, ROSLAGSTULL HOSP, DEPT INFECT DIS, S-10401 STOCKHOLM 60, SWEDEN
[5] GOTHENBURG UNIV, INST MED MICROBIOL, DEPT CLIN BACTERIOL, S-41124 GOTHENBURG, SWEDEN
[6] NATL BACTERIOL LAB, DEPT BACTERIOL, S-10521 STOCKHOLM, SWEDEN