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Third Olympian tests positive for Covid-19 in Tokyo

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As athletes begin arriving in Tokyo ahead of the Olympics, a Serbian rower has tested positive for Covid-19, bringing the total of athletes to test positive to three as cases are increasing in some parts of the world. NBC News’ Priscilla Thompson breaks down how Olympic officials are dealing with athletes who test positive for the virus and how the delta variant is spreading in the U.S. and across the globe.