Affiliation: | 1. Operations and Medical Division, The South African National Blood Service, Roodepoort, Gauteng, South Africa;2. Division of Medical Virology, Stellenbosch University, Stellenbosch, Western Cape, South Africa;3. Lelie Research, Alkmaar, The Netherlands;4. Department of Laboratory Medicine and Epidemiology/Biostats, University of California San Francisco, San Francisco, California, USA Vitalant Research Institute, San Francisco, California, USA |