The Helderstroom Correctional Centre in Caledon, Oberberg is on lockdown after an increase in Covid-19 positive cases.
At least 87 cases have been recorded amongst inmates over a period of four days.
The national spokesperson for Correctional Services, Singabakho Nxumalo said five staff members at the facility also tested positive for the virus.
The department of correctional services said it is working hard to contain the situation.
Inmates are still in the facility, however, visitors are not allowed.
” Critical at this stage is the activation of treatment and containment measures in order to prevent other officials and inmates from being exposed to the virus whilst the process of tracing and tracking the index cases is underway correctional services has isolated all the positive cases and quarantined the presumptive ones,” Nxumalo said.