A man wearing protective masks to help curb the spread of the coronavirus walks back home from work in Germiston, near Johannesburg, South Africa, Thursday, Aug. 13, 2020. An Africa-wide study of antibodies to the coronavirus has begun, while evidence from a smaller study indicates that many more people have been infected than official numbers show, the Africa Centers for Disease Control and Prevention said Thursday. (AP Photo/Themba Hadebe)
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