1. Department of Biochemistry and Microbiology, Nelson Mandela University, Port Elizabeth, South Africa.
2. Drug Utilization Research Unit (DURU), Department of Pharmacy, Nelson Mandela University, Port Elizabeth, South Africa.
3. Department of Medicine, Livingstone Hospital, Eastern Cape Department of Health, Port Elizabeth, South Africa.
4. National Health Laboratory Service, Groote Schuur Hospital Microbiology Laboratory, Cape Town, South Africa.
5. Division of Medical Microbiology, University of Cape Town, Cape Town, South Africa.