Covid in Schools: Masks, Shots Helped Protect College Students from Infection

Vaccinated and masked college students had virtually no chance of catching Covid-19 in the classroom last fall, according to a sweeping study of 33,000 Boston University students that bolsters standard prevention measures. The researchers screened the college’s health records to find nine sets of students who developed Covid at about the same time, were in class together without social distancing and had no known contact outside school, suggesting that they might have transmitted it in the classroom. However, genome analysis of coronavirus samples from the groups showed that all of them more likely were infected in other places.