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FILE - In this file photo dated Sunday, Feb. 7, 2021, a vial of the Oxford-AstraZeneca vaccine against COVID-19 at a hospital in Sofia, Bulgarian. South Africa on Sunday Feb. 7, 2021, has suspended 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/Valentina Petrova, FILE)

FILE - In this file photo dated Sunday, Feb. 7, 2021, a vial of the Oxford-AstraZeneca vaccine against COVID-19 at a hospital in Sofia, Bulgarian. South Africa on Sunday Feb. 7, 2021, has suspended 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/Valentina Petrova, FILE)

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