Players have been seen ignoring precautionary statements since the resumption of the PGA Tour
the PGA Tour is progressing despite three individuals testing positive for coronavirus.
Cameron Champ, the caddy of Graeme McDowell Ken Comboy and Brooks Koepka's caddy Ricky Elliott have the virus pulled out of this week's event in Cromwell, Connecticut.
PGA Tour Commissioner Jay Monahan said the news acted as a "grim reminder" to comply with security measures.
Seven tests of the 2,757 carried out have been positive since the return of the Tour.
In a statement on Twitter, four-time winner Koepka said he "didn't want to do anything that would affect a player's health in the field or his ability to compete."
He added, "The right thing to do now is go home and support Ricky."
While Champ was the only player to test positive for Covid-19 during the pre-tournament screening, fellow Americans Webb Simpson and Chase Koepka also chose not to play.
PGA chief Monahan outlined a number of further measures to be introduced, including additional tests, coaches being brought into the test bubble and fitness facilities available to players on site.
"We need to learn to live with this virus," added Monahan.
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Monahan's announcement came after players were seen ignoring social distance rules since the Tour resumed.
Those indiscretions include punching fists at the end of the round, while some players have been unable to adjust spitting habits on fairways and greens.
A recommendation that only the golfer interacts with his clubs also seems to have been virtually ignored.
And Monahan has warned about the consequences for anyone who does not comply with safety protocols.
"We all have an extraordinary responsibility to follow those protocols, for any individual who is not there, there will be serious consequences," he said.