South Africa's Olympic 400 metres champion Wayde van Niekerk tested positive for COVID-19 in Italy last week, according to the Gazzetta dello Sport newspaper.
Van Niekerk, who romped to Olympic gold four years ago in a world record time of 43.03 seconds, was set to participate in a meet in Trieste - his first competition outside of South Africa since 2017 following a serious knee injury.