Australia's Chef de Mission for the Winter Olympics says the team's experience at the Tokyo Summer Games has reassured him that the health protocols in place in Beijing will keep his athletes safe.

Beijing marked the 100-day countdown to the Games on Wednesday, with the city's vice mayor Zhang Jiandong expressing confidence that epidemic control measures would work even as China continues to battle COVID-19 flareups.

Geoff Lipshut, who will lead Australia's team of 40 fully-vaccinated athletes, said the health measures were not "unusual or unexpected."