Almost 4,000 people in Massachusetts who are fully vaccinated have tested positive for coronavirus, according to new data from the state Department of Public Health.
There have been 3,791 COVID cases out of more than 3.7 million fully vaccinated people as of June 12. That breaks down to 0.1% of vaccinated individuals testing positive for coronavirus in Massachusetts.
The state Department of Public Health did not say how many of the breakthrough infections have been severe, but public health experts tell the Herald that many of such cases are either asymptomatic or mild.
“We’re learning that many of the breakthrough infections are asymptomatic or they’re very mild and brief in duration,” said Boston University infectious diseases specialist Davidson Hamer. “The viral load is not very high.
“Breakthroughs are expected, and we need to better understand who’s at risk and whether people who have a breakthrough can transmit the virus to others,” he added. “In some cases, they’ll be shedding such low levels of the virus and won’t be transmitting to others.”
People who are immunocompromised are at a greater risk for breakthrough cases.
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