Lockout restrictions across the Greater Darwin region will be lifted at midnight tonight, despite one new case of COVID-19 overnight connected to the first detected case, Chief Minister Michael Gunner said.

The man has been in isolation for his entire infectious period and had entered the Howard Springs quarantine facility on November 5.

“The new case was not a threat to the community. He is fully vaccinated and is experiencing mild flu like symptoms,” Mr Gunner said.

The man initially tested negative upon arrival at Howard Springs and his second Covid test also came back negative, Mr Gunner said.

The mandatory wearing of masks meanwhile will remain in place in Greater Darwin until 5pm on Friday.

The total number of cases for the Darwin and Katherine cluster now stands at four.

“Public exposure sites have been updated and some locations reclassified,” a statement from the government said.

“The Humpty Doo Hotel inside bar area remains a close contact public exposure site for 2 November 2021 between 7.15pm and 7.30pm. It is important all people in the NT to regularly check the COVID-19 website to review the list of NT public exposure sites.

NT Health said contact tracers had not identified any new close contacts since yesterday. The statement said 914 casual contacts have been identified, with the “vast majority” returning a negative test, with more results expected later today.

“Significant testing has been undertaken with 2387 COVID-19 tests completed across the NT in the past 24 hours, with all except the latest positive case returning negative results,” the statement said.

“It is critical that anyone who has symptoms gets tested for COVID-19 so we can ensure any spread of COVID-19 in the NT has been contained.”

Wastewater testing up to November 7 have come back negative, the government said.