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people is a safe place to stay. reporter: but health experts say the wider strategy of keeping foreign visitors away from locals is failing. it s obvious that the bubble system is kind of broken. so there s a sense of interaction to the local people. reporter: tokyo officials insist they are containing the situation with only a few dozen cases among some 22,000 foreigners who arrived for the games so far. if i thought all the tests were going to be negative, i wouldn t bother doing the tests. and the numbers are lower. probably lower than we expected. reporter: and the advanced testing requirement is filtering out positive cases before people fly into japan. including 17-year-old coco gauff who tested positive in the u.s. before flying. and a player from the u.s. women s basketball team who tested positive despite being