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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. (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. (AFP via Getty Images)

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