U.S. begins study testing mix-and-match Covid vaccine booster shots – CNBC

A health care clinician prepares a dosage of the Johnson & & Johnson vaccine for the coronavirus disease (COVID-19) for a commuter throughout the opening of MTAs public vaccination program at the 179th Street train station in the Queens borough of New York City, New York, U.S., May 12, 2021. Shannon Stapleton

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