Racing fixtures at Del Mar have been suspended after 15 jockeys tested positive for coronavirus.
The US track was due to hold fixtures on Friday, Saturday and Sunday.
But they were cancelled following the outbreak, which has affected leading riders Victor Espinoza and Flavien Prat.
Officials state they are asymptomatic and will isolate for ten days.
It is hoped racing will resume in the Californian city on July 24.
Medical director of San Diego epidemiology and immunisation department, Dr Eric McDonald, said: "Assuming these individuals continue to show no symptoms, they will be isolated for a total of 10 days and should be able to resume their usual activities, including riding after that time."
The tests were taken on Tuesday by all of the jockeys and associated personnel at the request of the Del Mar Thoroughbred Club.
Dual Italian champion Umberto Rispoli was one of the group who tested positive.
"I'm feeling more than well, quarantined, and looking forward to coming back stronger then before," he said.
On July 10 the racecourse held its meeting without spectators, the first time in its 81-year history.
Just like in the UK, it was run with a range of coronavirus precautions, including temperature checks, face coverings and social distancing measures.
Many of the contests that were due to be held this weekend could be saved for the next racecard– including the $150,000 San Diego Handicap and the $200,000 Eddie Read Stakes.
“Canceling this weekend’s races will give us additional time to monitor the situation and give the individuals who tested positive additional time to recover," said Del Mar chief executive Joe Harper.
As of Wednesday, California had nearly 353,000 confirmed cases of Covid-19, the second-most in the country behind New York.
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