1. International Laboratory Branch, Division of Global HIV and Tuberculosis, Center for Global Health, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
2. National Institute for Communicable Diseases/NHLS, Johannesburg, South Africa
3. Division of Virology, School of Pathology, University of the Witwatersrand Medical School, Johannesburg, South Africa
4. Africa Centres for Disease Control and Prevention, African Union, Addis Ababa, Ethiopia