School districts throughout the U.S. are getting a firsthand lesson on what a fall reopening could bring: sporadic closures as students and staffers test positive for Covid-19.

At least half the states have districts that have shut down summer athletic training mainly due to students and coaches testing positive for the virus, some of whom passed pre-screening checks. The experience has been a wake-up call for administrators planning to open schools for in-person learning after summer break.

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