1. Department of Medical Microbiology, Faculty of Health Sciences, University of Pretoria, Pretoria, South Africa;
2. Department of Medical Microbiology, Tshwane Academic Division, National Health Laboratory Service (NHLS), Pretoria, South Africa;
3. Gauteng Department of Health, Rahima Moosa Mother and Child Hospital, Wits Obstetrics and Gynaecology Clinical Research Division, Department of Obstetrics and Gynaecology, University of Witwatersrand, Johannesburg, South Africa