, by the CDC and the Georgia Department of Public Health, traced positive cases linked to any of eight elementary schools in the Marietta City Schools, where in-person instruction resumed in November.
The investigation took place over roughly 7 weeks between December 2020 and the end of January 2021. Because it spanned the winter holidays, there were only 24 days of in-person school. Out of 2,600 students and 700 staff, researchers identified nine clusters of infections involving 45 positive cases: 13 teachers and 32 students. In four out of the nine clusters, teachers were the index case, meaning they were the first to catch the virus and bring it to their classrooms. In one cluster, a student was the first case. And in four others, teachers and students got sick at roughly the same time, so investigators couldn’t be sure who was first to get it.
Researchers say the school study findings offer a few lessons. First, teachers seem to play a key role in the spread of the infection.
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