The first time the Delta variant was reported in New York City was in a retroactive disclosure made by the de Blasio administration in an overdue study.
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Overdue data released on Sunday by the de Blasio administration made the retroactive revelation that the B.1.617 variant, which was first detected in India, has been sequenced from COVID-19 samples in New York City as long back as the first week of April. NYC Mayor's Office (YouTube/Fair Use)