Vaccinated People May Spread the Virus, Though Rarely, C.D.C. Reports

The agency cited an outbreak in Provincetown, Mass., in which most of the infected were immunized. Unpublished C.D.C. documents paint an even more harrowing picture.,The agency cited an outbreak in Provincetown, Mass., in which most of the infected were immunized. Unpublished C.D.C. documents paint an even more harrowing picture.

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