Emelda Ramutshila | South African Field Epidemiology Training Programme, National Institute for Communicable Diseases a division of National Health Laboratory Services; Johannesburg, South Africa | emeldar@nicd.ac.za 
Tebogo Matjokotja | Gauteng Department of Health, Public Health Directorate, Johannesburg, South Africa | Tebogo.Matjokotja@gauteng.gov.za 
Refilwe Mokgetle | Gauteng Department of Health, Public Health Directorate, Johannesburg, South Africa | Refilwe.Mokgetle@gauteng.gov.za 
Hellen Kgatla | South African Field Epidemiology Training Programme, National Institute for Communicable Diseases a division of National Health Laboratory Services; Johannesburg, South Africa | hellenk@nicd.ac.za