1. Department of Microbiology and Immunology, Weill Bugando School of Medicine, Catholic University of Health and Allied Sciences, P.O. Box 1464, Mwanza, Tanzania
2. Department of Obstetrics and Gynecology, Weill Bugando School of Medicine, Catholic University of Health and Allied Sciences, P.O. Box 1464, Mwanza, Tanzania
3. Department of Biological Sciences, Eduardo Mondlane University, Maputo, Mozambique
4. Institute of Allied Health Sciences, Catholic University of Health and Allied Sciences, P.O. Box 1464, Mwanza, Tanzania
5. Department of Microbiology and Immunology, Muhimbili University of Health and Allied Sciences, P.O. Box 65001, Dar es Salaam, Tanzania