FILE — In this Thursday, Dec. 24, 2020 file photo, a long-distance traveller undergoes a COVID-19 test at a mobile clinic at a taxi rank at Johannesburg's main railway station. As a result of holiday gatherings, African officials warn of a resurgence of COVID-19 on the continent and urge increased testing to combat it. The level of testing across Africa is considerably less than what health experts say is needed to effectively control the spread of the disease. (AP Photo/Denis Farrell, File)
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