Hospital operator, the Mandela Bay Development Agency (MBDA), has reported the incident to the police, while the M Secure company suspended the guard.
The MBDA provided News24 with an incident report drafted by M Secure director Kaashief Niekerk who said two companies were responsible for security at the facility.
He added his company was responsible for internal security at the isolation facility, while another company, HRG, guarded the stadium's outer perimeter.
"It is deducted that Mr Doch passed the internal security checkpoint unnoticed as a result of the M Secure officer not being at his post.
Niekerk said Doch left the stadium at 14:30 on Friday, but the incident was only reported to M Secure's management at 17:00 during the changing of shifts.
