People wearing face masks to prevent the spread of coronavirus walks past a bivouac where clinical trials for covid-19 vaccines are conducted, in Rabat, Morocco, Monday, Dec. 7, 2020. (AP Photo/Mosa'ab Elshamy)
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People wearing face masks to prevent the spread of coronavirus walks past a bivouac where clinical trials for covid-19 vaccines are conducted, in Rabat, Morocco, Monday, Dec. 7, 2020. (AP Photo/Mosa'ab Elshamy)
