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Omicron variant claims its first victim in the U.S.December 21, 2021 -
COVID variants are getting better at airborne transmission; studySeptember 18, 2021 -
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 -
LA County reaches grim milestone of 1 million COVID-19 cases, first case of UK variant foundJanuary 17, 2021