Funding for this research was provided by:
National Research Foundation (TTK20100723000013129)
Poliomyelitis Research Foundation (13/25)
Received: 24 February 2020
Accepted: 24 June 2020
First Online: 2 July 2020
Ethics approval and consent to participate
: Buffy coats were obtained from the Western Province blood bank and as all donors were anonymous, there was no need to obtain informed consent. The protocol was approved by the University of Cape Town Ethics in Research Committee of the Faculty of Science, SFREC 003_2012 and University of Cape Town Human Research Ethics Committee of the Faculty of Health Sciences, HREC554/2017.
: Not applicable.
: The authors declare that they have no competing of interests.