Signs reminding customers of social distancing are seen at a pharmacy during COVID-19 outbreak in Johannesburg, South Africa, April 10, 2020. (Xinhua/Chen Cheng)

Photo shows a notice of social distancing during COVID-19 outbreak in Johannesburg, South Africa, April 10, 2020. (Xinhua/Chen Cheng)

Photo shows a sign of social distancing during COVID-19 outbreak in Johannesburg, South Africa, April 10, 2020. (Xinhua/Chen Cheng)