Ramotshela said that the professor came to his office on March 18, when he reported that he was not feeling well, and had been booked off sick since then.
Following the disclosure that the professor had tested positive, his colleagues were sent home for self-isolation and were advised to go for testing.
''A follow-up will be conducted to establish their status,” he said.
Ramotshela said that the Winnie Madikizela-Mandela Building on the Muckleneuk campus was closed and that disinfection of the building is being planned.
''Many buildings have been closed to ensure that no further contamination takes place. This has been done in anticipation of the planned disinfection of all the Unisa buildings.''
He said that staff members have been provided with sanitisers, gloves and masks ''wherever possible''.