1. Department of Microbiology, National Health Laboratory Service, KwaZulu-Natal Academic Complex, Inkosi Albert Luthuli Central Hospital, Durban, South Africa.
2. Department of Medical Microbiology, School of Laboratory Medicine and Medical Science, College of Health Sciences, University of KwaZulu-Natal, Durban, South Africa.
3. HIV and other Infectious Diseases Research Unit, South African Medical Research Council, Durban, South Africa.
4. Department of Paediatrics and Child Health, Nelson R. Mandela School of Medicine, University of KwaZulu-Natal, Durban, South Africa.