Mr Barilaro said the upper part of the local government area would remain under stay home orders until Sunday as planned.
"I know you've been doing it tough: you've been locked down for a period of time, but that was off the back of a significant seeding event, and the transmission of COVID in that area," he said.
"We make these decisions to protect everyone, you, your family, the state and the nation."
Chief Health Officer Kerry Chant said all close contacts of the 18-year-old road-tripping through regional NSW had tested negative.
Shoppers wearing masks in Neutral Bay on Sydney's lower north shore.