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N95s. theyve provided no clear directions. they should be recommending n95 respirators. >> reporter: vaccines are also another crucial tool, but they are not required. why? well, requiring them could create an uneven playing field. >> we were fairly confident that we would have vaccine by now, but we also knew if we had one, it wouldnt be equally available around the world, it wouldnt necessarily be in good supply. >> reporter: still, the ioc estimates more than 80% of residents of the olympic v...