Brooks Koepka, the No. 4 ranked golfer in the world, is pulling out of the Travelers Championship after his caddie tested positive for coronavirus.

Ricky Elliott, Koepka’s caddie, learned he tested positive for the virus Wednesday morning at TPC River Highlands in Connecticut, where the tournament is set to take place. Koepka has subsequently announced that he will not be participating in the event.

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“I’m going to pull out to protect everybody else. I think it’s the right thing to do,” he told Golfweek. “I don’t want to risk anyone’s life if they have respiratory issues or underlying conditions. The only way this Tour can continue is if guys to do this sort of thing and be proactive about it.”

Koepka, Elliott and his coach Claude Harmon III went for additional coronavirus tests as a precaution after playing a round with Graeme McDowell on Tuesday. McDowell told Golfweek on Tuesday that he was going to withdraw from the event after his caddie, Ken Comboy, tested positive for the virus.

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“We all got tested Monday—myself, Claude and Ricky. We all came back negative,” Koepka told Gofweek. “We had no symptoms. Nothing.”

Once learning Elliott had tested positive, Koepka decided to withdraw from the event. He said his decision was meant to protect the larger field.

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Koepka is waiting for additional results from his girlfriend, Jena Sims, and his chef to determine whether to go back to Florida or quarantine in Connecticut.