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Is the U.S. COVID-19 Vaccine Rollout Working? We’re Not Sure Yet

April 8, 2021


After four months and 171 million doses of COVID-19 vaccines administered across the U.S., more than a few of us are eager to know: are the shots working?

Thus far, available evidence can half-answer that question: The vaccines are working well for those who can get them. As soon as the rollout kicked off, a variety of researchers began conducting what might be considered an unofficial phase 4 clinical trial, monitoring early vaccine recipients among the general public. Several of their studies have found a significant reduction in both the rates of infection and severity of symptoms among vaccinated populations compared to similar demographics who are still awaiting a dose.

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