<p>Brown University medical leader Dr. Megan Ranney discusses how the one-shot J&J vaccine could alter the forecast for U.S. immunity.</p>

Brown University medical leader Dr. Megan Ranney discusses how the one-shot J&J vaccine could alter the forecast for U.S. immunity.

<p>Brown University medical leader Dr. Megan Ranney discusses how the one-shot J&amp;J vaccine could alter the forecast for U.S. immunity.</p>

J&J's One Dose and Durability of Vaccine Immunity

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