NOVEMBER 2020:In this photo illustration, Frontline worker, checking for Covid-19 “Routine testing seems to be better in this age group” because younger adults often have no symptoms, she said.AdvertisementThe study was led by researchers from the Icahn School of Medicine at Mount Sinai in New York and the Naval Medical Research Center.It involved 1,848 Marine recruits, about 90% of them men, who were told to isolate themselves for two weeks at home, then in a supervised military quarantine at a closed college campus, The Citadel in Charleston, South Carolina, for two more weeks.