A member of Japan's gold medal-winning softball team will have her medal replaced with a fresh one following an outcry on social media after the mayor of her hometown chomped down on the original.

At an event held last week to celebrate Miu Goto's achievement at the Tokyo 2020 Games, Takashi Kawamura, mayor of central Japan's city of Nagoya, pulled down his mask and put her gold medal between his teeth.

"With support from the International Olympic Committee and in line with her own intention, Ms Goto's medal is now set to be exchanged for a new one," Tokyo 2020 organisers said, adding that the IOC will bear the cost of the exchange.

The mayor received a wave of criticism on social media for disregarding coronavirus etiquette and was accused of showing a lack of respect for her feat.

There was even a rare rebuke from Toyota Motor Corp, which owns the Red Terriers softball team that Goto plays for. Goto or Kawamura were not immediately available for comment.

Meanwhile, Jamaican gold-medal winner Hansle Parchment has revealed that he only made it to the 110m hurdles final thanks to a kind-hearted volunteer, who gave him money for a taxi.

Parchment accidentally boarded the wrong shuttle bus and ended up at an aquatics venue, and he was told he would have to take a bus back to the Olympic village and then another to the stadium.

"If I had done that, I wouldn't get there in time to even warm up," he said in a video on social media.

"I had to find another way. I was trying to get one of the branded cars for the Games to take me, but these people are very strict and adhering to the rules, and I would have to have booked the car from beforehand to get it to leave.

"I saw this volunteer and I had to beg, 'cause of course she is not allowed to do much, and she actually gave me some money to take one of the taxis. And that's how I was able to get to the warm-up in time, and had enough time to compete."

"You were instrumental in me getting to the final that day," he tells the volunteer, Tiana, after finding her and showing her his medal.

Jamaica's minister for tourism Edmund Bartlett said the country wanted to offer Tiana a free trip to the Caribbean country to thank her.