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abstractpubmed· Abstract 2020· item PMID:32597750

Antibody Responses after Classroom Exposure to Teacher with Coronavirus Disease, March 2020. After returning from Europe to the United States, on March 1, 2020, a symptomatic teacher received positive test results for severe acute respiratory syndrome coronavirus 2. Of the 21 students exposed to the teacher in the classroom, serologic results suggested past infection for 2. Classroom contact may result in virus transmission.