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Since Americans first began rolling up their sleeves for coronavirus vaccines, health officials have said that those who are immunized are very unlikely to become infected, or to suffer serious illness or death. But preliminary data from seven states hint that the arrival of the delta variant in July may have altered the calculus.

Breakthrough infections in vaccinated people accounted for at least 1 in 5 newly diagnosed cases in six of these states and higher percentages of total hospitalizations and deaths than had been previously observed in all of them, according to figures gathered by The New York Times.

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