In this Nov. 30, 2020, file photo, Thabisle khlatshwayo, who received her first shot for a COVID-19 vaccine trial, receives her second AstraZeneca shot at a vaccine trial facility set at Soweto's Chris Sani Baragwanath Hospital outside Johannesburg, South Africa. South Africa suspended on Sunday Feb. 7, 2021, plans to inoculate its front-line health care workers with the AstraZeneca vaccine after a small clinical trial suggested that it isn't effective in preventing mild to moderate illness from the variant dominant in the country. (AP Photo/Jerome Delay, File)
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