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Why isn’t the U.S. doing more to track coronavirus variants?February 12, 2021 -
How should new COVID-19 variants change our behavior?February 9, 2021 -
Expert: Variants demonstrate need to speed up vaccinationsFebruary 1, 2021 -
COVID-19 mutations complicate efforts to slow the spreadJanuary 25, 2021 -
Moderna says vaccine protects against UK variant, but developing booster for South African mutationJanuary 25, 2021