Australian golf star Adam Scott and Canadian Formula One driver Lance Stroll are among the latest batch of sports people to announce they tested positive for coronavirus.
Scott, the winner of 14 PGA Tour titles, last competed in September's US Open and was forced to withdraw from this week's event in California - a key lead-up to next month's Masters.
"While it's difficult news to receive - as I really looked forward to playing this week - my focus now is on recovery for the final stretch of the fall," world No. 15 Scott - who won his sole major at Augusta National in 2013 - said.
Stroll and his Racing Point team-owner father Lawrence tested positive for COVID-19 after this month's Eifel Grand Prix.
Stroll, 21, who left the Nuerburgring before the October 11 race after flu-like symptoms and an upset stomach, said on social media he was now clear and ready to compete in Portugal this weekend.
A team spokesman said Lawrence, who is executive chairman of British sportscar maker Aston Martin, tested positive at home on the day of the race but was back at work after isolating.
The situation raised concerns about transparency at the team and the COVID-testing protocols but Racing Point boss Otmar Szafnauer said in a statement they had acted according to guidance.
The only other Formula One driver to date to contract the virus is Stroll's Mexican teammate Sergio Perez, who missed two races in August after a trip home to see his mother.
In soccer, UEFA allowed Bayern Munich to play Atletico Madrid in the Champions League on Wednesday despite a positive coronavirus test for forward Serge Gnabry.
Defender Achraf Hakimi became the sixth Inter Milan player to test positive for coronavirus - although he was "completely asymptomatic" - and was ruled out of Wednesday evening's Champions League match against Borussia Moenchengladbach.
Swiss side Sion said their entire first-team squad has been placed in quarantine as they asked the league to postpone their next two games.
In rugby league, Catalans Dragons' Super League fixture with Hull FC on Thursday was cancelled after five of their players and two members of the backroom staff tested positive for COVID-19.
Meanwhile, the United States won't send a team to the world wrestling championships because of health and safety concerns caused by the pandemic.
Australian Associated Press