However, the decision to remain in Cape Town was made following “extensive consultation” with medical experts.
Jurie Roux, chief executive of SA Rugby, said the data “pointed in only one direction”.
“The series has already been significantly disrupted by Covid-19,” added Roux.
“We now have two teams in bio-secure environments without any positive cases or anyone in isolation. To now return to the Highveld would expose the series to renewed risk.