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What other professions were included in the comparison group? I also wonder how the researchers accounted for the many other potential sources of exposure for adults in those other professions (such as office spaces, commuting, going to the gym, going to bars and restaurants...)
The comparison group was all professions other than day-care, primary and secondary school teachers. No adjustments for other sources of exposure. The conclusion is just that teachers do not have an exceptionally high risk.
Why would they, if reasonable precautions, good ventilation are available? The adults can better keep themselves distanced from the kids than the kids can from each other. They will mainly spread it to their parents. The US can't afford this additional channel of community spread
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