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After a small study raised concerns about the effectiveness of the AstraZeneca vaccine against the variant in South Africa, the country put its AstraZeneca vaccine plans on hold. "It is time, unfortunately, for us to recalibrate our expectation of COVID-19 vaccines," said Shabir Madhi, professor of vaccinology at the University of Witwatersrand, shown above at a vaccine trial facility. Jerome Delay/AP hide caption

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Jerome Delay/AP