from July 3 to July 17, the per-day COVID-19 case rate among residents spiked from zero per 100,000 people to 177 per 100,000 people. Among Massachusetts residents who tested positive there, three-fourths were fully vaccinated, and among those vaccinated people, 79 percent—274 individuals—experienced symptoms, mild in most cases. These numbers, along with numbers gathered elsewhere, suggested that breakthroughs were turning out to be more common and more serious than the CDC previously expected. The shots still reduce the severity and deadliness of infections, but compared with the original coronavirus, the Delta variant increases the chance that, if infected, vaccinated people can transmit the virus.
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