A security guard sits on a bench in Johannesburg, South Africa, March 30, 2020. (Photo by Yeshiel Panchia/Xinhua)

A notice reminding people to wash their hands is posted on the door of a store in Johannesburg, South Africa, March 30, 2020. (Photo by Yeshiel Panchia/Xinhua)

A cleaner wearing a mask works on the street in Johannesburg, South Africa, March 30, 2020. (Photo by Yeshiel Panchia/Xinhua)