The 32-year-old won a silver medal on Tuesday in her third appearance at the Olympics since 2012 in London.
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The 24-year-old qualified at the Tokyo Olympic Stadium by winning semi-final 1 with a time of 12.62 seconds, leaving Bahamas’ Devynne Charlton who had 12.66 in second place.
One athlete who is not staying in the Olympic Village is among those who tested positive, they said.
This decision has come after it decided to bar international spectators amid public concerns over the novel coronavirus.
The 83-year-old Yoshiro Mori, a former Japanese prime minister and head of the Tokyo committee organising the postponed Summer Games this year, had told a newspaper earlier that he may step down if calls for his resignation continue.