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at the same time, the mingling and pressing of population is incredibly limited we can ensure that transmission between the various groups is almost impossible. >> reporter: since july 1st, according to the organizing committee, 55 people under the jurisdiction have tested positive for covid-19 including four athletes all nonresidents of japan, four media and the others games concerned personnel. on sunday, the south african team announced two players tested positive in the olympic village. >> screening program since first of july has already delivered more than 30,000 results. so that's how diligent we are in terms of monitoring the population which is here and we're going to continue to do so >> reporter: tonight, b dozens of people under quarantine, athletes just hoping twhoent h they won't have to miss their big event molly hunter, nbc