New data backs public health rules from earlier in the pandemic.
The study, which followed schools in the Boston region during the 2021-2022 academic year, found that the end of mask requirements was associated with an additional 45 coronavirus cases per 1,000 students and staff members — or nearly 12,000 cases during a 15-week period from March to June.in February. But 70 nearby school districts did away with masking mandates.Before that split, coronavirus trends were similar across the school districts.
The toll of the additional coronavirus cases was stark: They translated into at least 17,500 missed school days for students and 6,500 missed school days for staff members, at a time when schools were following an isolation period of at least five days for those infected, the study said.helped most when the levels of virus were highest, suggesting that the safety measure is most useful just before or throughout periods of high transmission.
The school districts that continued with masking mandates had larger percentages of students of color, students from low-income backgrounds, students with disabilities and English learners, the study said. They also tended to have older buildings, with outdated or missing ventilation and filtration systems and larger class sizes.
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