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Paul Adamus, 7, climbs the stairs of a bus before the first day of school on Aug. 3 in Dallas, Ga. Adamus is among tens of thousands of students in Georgia and across the nation who were set to resume in-person school Monday for the first time since March. (Brynn Anderson/AP)

On Wednesday, teachers in Georgia’s largest school district returned to elementary, middle and high school campuses to start in-person planning for the fall semester.

By the next day, 260 district employees had been barred from entering their schools, either because they tested positive for the coronavirus or had been directly exposed to someone who had.