Health worker collects blood sample for COVID-19 antibody test in Maputo, Mozambique

A health worker collects blood sample for COVID-19 antibody test in Maputo, Mozambique on Aug. 3, 2020. Health authorities of Mozambique launched Monday a sero-epidemiological survey on COVID-19 in the country's capital city Maputo, which was set to cover 11,000 individuals in its seven districts, to assess the degree of people's exposure to the virus. (Photo by Israel Zefanias/Xinhua)