"For the health and well-being of all those associated with the tournament and those in the community, the tour implements its response plan in consultation with medical experts, including working with those who may have been in close contact with him, "the statement said. .
McCarthy said he felt tired on Thursday, but thought it was because of the difficulty he had trained with earlier in the week.
"Last night I woke up in the middle of the night with aches and pains and I felt something was wrong," said McCarthy. "I felt like the only thing to do was to get tested at that time before going to class."
The PGA said that McCarthy would self-isolate and follow guidelines established by the Centers for Disease Control and Prevention.
The PGA said 16 others had been tested, including McCarthy's caddy, the two players who played alongside him in the first round, Matt Wallace and Bud Cauley, and their cadets. McCarthy is the only positive result, but Cauley decides to withdraw as a precaution.
"I am very grateful to have tested negative, but I decided to withdraw as a precaution for my peers and everyone involved in the tournament," said Cauley.
"What Denny, Bud and others demonstrate is exactly what we asked everyone - keep doing your part by taking this virus seriously and not only taking care of your own health, but also of your own. fellow competitors and those you might come in contact with, "said Jay Monahan, commissioner of the PGA Tour.
"We will continue to liaise directly with local and national authorities and health officials this week and throughout our return to golf," he said.
Last week, golfer Nick Watney tested positive at the RBC Heritage tournament, and Cameron Champ tested positive earlier this week.
