Created: April 22, 2021 04:00 PM (ABC 6 News) - The Minnesota Department of Health reported Thursday cases in schools are rapidly approaching the levels we saw in November when schools first decided to switch to distance learning. "It's about a third of our cases over the last week have been in school-aged children," Graham Briggs, the director of Olmsted County Public Health, said. With students back at their desks, the Covid-19 virus has a grip on schools. Here in Rochester, the number of students quarantining is greater than any time since last fall. "We're seeing it not just in Rochester Public Schools, but throughout the county and all of our districts really. We're seeing this increased percentage of our cases in school-aged children," Briggs said.