There were errors in the affiliation given for authors. The correct list of affiliations is available below.
1Institute of Infectious Disease and Molecular Medicine, University of Cape Town, Cape Town, South Africa,
2Division of Medical Virology, Department of Clinical Laboratory Science, University of Cape Town, Cape Town, South Africa,
3Department of Microbiology & Immunology, Albert Einstein College of Medicine, Bronx, New York, USA,
4Department of Medicine, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa,
5Medical Research Council, Cape Town, South Africa,
6National Health Laboratory Service, Cape Town, South Africa.
Footnotes
Competing Interests: No competing interests declared.