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August 3 2021 12:51pm

CDC warns of breakthrough COVID-19 cases after outbreak among vaccinated people at Massachusetts event

The Centers for Disease Control and Prevention in the U.S. are warning the new Delta variant of COVID-19 is spreading even among vaccinated Americans, with officials calling it as contagious as chicken pox. It comes after a CDC review found nearly three-quarters of those infected at an outbreak in Provincetown, Mass., were fully vaccinated.

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