Delaware’s Laurel School District closed its campuses Thursday and Friday to “deep clean” its schools after it was learned that a staff member had recently had contact with a traveler from a country with a viral outbreak. Neither the staff member nor the traveler had symptoms, and the Delaware Division of Public Health advised the district that closing schools was an “unnecessary precaution.”Laurel is just one of a growing number of districts across the country in which schools are deep cleaning their buildings in the fight against the spread of the novel coronavirus, which causes the pandemic illness covid-19 — though some experts on infectious diseases say it could well be a waste of time.Deep cleaning involves floor-to-ceiling cleaning and disinfecting in a school building that sets the stage for regular, less comprehensive cleaning of heavily traveled areas and surfaces. Some schools are closing down briefly for deep cleaning and hiring third-party companies to do the job, while others are doing it on the weekend and with their own custodial staff.Marcus Plescia is the chief medical officer of the Association of State and Territorial Health Officials, which represents state public health departments. He said deep cleaning may be a waste

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