Tsakani Mnisi | Limpopo Department of Health, Special Health Programs, Mopani District, Giyani, South Africa | tjtsakani@gmail.com
Jack Manamela | Centre for Vaccines and Immunology, National Institute for Communicable Diseases, Johannesburg, a division of National Health Laboratory Services South Africa | jackm@nicd.ac.za 
T.E. 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
Genevie Ntshoe | Division of Public Health Surveillance and Response, National Institute for Communicable Diseases a division of National Health Laboratory Services, Johannesburg, South Africa, Johannesburg, South Africa  | genevien@nicd.ac.za
Thembeka Semenya | Limpopo Department of Health, Public Health Directorate, Polokwane, South Africa | tembekas@yahoo.com
Freda Ngobeni | Limpopo Department of Health, Public Health Directorate, Polokwane, South Africa | fredangobeni@yahoo.com
Tumiso Malatji | Limpopo Department of Health, Public Health Directorate, Polokwane, South Africa | tumimalatji79@gmail.com
U.B. Makugo | Division of Public Health Surveillance and Response, National Institute for Communicable Diseases a division of National Health Laboratory Services, Johannesburg, South Africa, Johannesburg, South Africa | UnarineM@nicd.ac.za