Massachusetts coronavirus breakthrough cases jump 4,415 last week, more than 600 fully vaccinated people a day

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18 breakthrough deaths were reported last week

Breakthrough cases of the coronavirus continue to climb in Massachusetts. (Herald file photo.)

More than 4,000 fully vaccinated people in Massachusetts tested positive for the coronavirus last week, a daily average of more than 600 people as breakthrough infections continue to rise each week amid the delta variant.

The rate of breakthrough infections week-over-week starting five weeks ago surged 64%, then the following week went up 20%, the next week jumped by 25%, the subsequent week increased by 20%, and in the last week climbed by 23%.

Breakthrough cases in Massachusetts are making up about one-third of the state’s overall cases. People who are unvaccinated are at a higher risk for infection and a severe case.

Overall, 23,858 fully vaxxed people have tested positive for the virus, according to new data from the state Department of Public Health on Tuesday. That’s 0.53% of the more than 4.5 million fully vaxxed people in Massachusetts.

The nearly 24,000 overall cases is an increase of 4,415 breakthrough infections from last week — or a daily average of 631 fully vaccinated people testing positive.

Last Tuesday’s report showed a rise of 3,704 breakthrough cases, a daily average of 529 fully vaxxed people testing positive.

The previous week was a jump of 3,098 infections, a daily average of 443 fully vaxxed people.

The prior week was a jump of 2,672 infections, a daily average of 382 infections.

The week before that was a rise of 2,232 breakthroughs, a daily average of 319 infections.

Breakthrough hospitalizations account for about 25% of current COVID-19 hospitalizations. Those who are unvaccinated are at a much higher risk for a severe case and hospitalization.

There have been 762 hospitalizations among fully vaccinated people in Massachusetts, which is 0.02% of those who are fully vaxxed.

The 762 total patients is a one-week increase of 111 fully vaxxed patients. The previous weekly increase was 80 fully vaxxed patients.

The state has reported 162 breakthrough deaths, or 0.004% of those who are fully vaxxed. That’s a one-week increase of 18 deaths. The previous weekly increase was 13 deaths, and the week before that was seven deaths.

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