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COVID-19 sample viles are shown during preparation for isolation and extraction at the Genview Diagnosis lab on August 13, 2021 in Houston, Texas.

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Omicron, the newest coronavirus variant, is also the quickest to be labeled a "variant of concern" by the World Health Organization because of…

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A firefighter prepares pediatric doses of the Pfizer-BioNtech Covid-19 vaccine on November 3 in Shoreline, Washington.