CDC urges vaccinated people in high-transmission areas to resume wearing masks indoors as delta variant spreads

The rapidity of the spread of the delta variant, originally identified in India, took U.S. officials by surprise. The first infection here was identified on March 16, according to testing data compiled by the genomics company Helix. For two months, it made little impact, and the alpha variant, first seen in the United Kingdom, became the dominant strain across the country.

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