1. Department of Medical Microbiology; Makerere University Medical School; PO Box 7072 Kampala Uganda
2. Department of Veterinary Parasitology and Microbiology; Faculty of Veterinary Medicine; Makerere University; PO Box 7062 Kampala Uganda
3. Department of Microbiology, Tumour and Cell Biology; Karolinska Institute; SE-171 77 Stockholm Sweden
4. Department of Bacteriology; Swedish Institute for Infectious Disease Control; SE-171 82 Solna Sweden