Other experts also praised the scale and rigor of the analysis. South Korean researchers identified 5,706 people who were the first to report COVID-19 symptoms in their households between Jan. 20 and March 27, when schools were closed, and then traced the 59,073 contacts of these “index cases.” They tested all of the household contacts of each patient, regardless of symptoms, but only tested symptomatic contacts outside the household.
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July 19, 2020 at 06:20AM
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Older children spread the coronavirus just as much as adults, study finds - Chicago Tribune
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