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COVID-19 Vaccine Makers' Booster Shots Aim At A Moving Target: Coronavirus Variants

Vaccine makers are moving to test booster shots, prompted by new coronavirus variants that have sprung up in South Africa, the U.K. and elsewhere. (Mark Felix/AFP via Getty Images)
Vaccine makers are moving to test booster shots, prompted by new coronavirus variants that have sprung up in South Africa, the U.K. and elsewhere. (Mark Felix/AFP via Getty Images)

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