A file image of the Howard Springs facility - AAP 1 of 1 5370537724001 A 70-year-old man who travelled from Indonesia to Darwin on his own yacht has tested positive for COVID-19. Authorities say the man is the only new case of the virus reported in the Northern Territory in the past 24 hours. He arrived in the Territory on July 13 and is in quarantine under the care of the NT Centre for National Resilience with mild symptoms. The case came as coronavirus fragments were also detected in wastewater samples in Darwin although authorities say there's no risk to the wider community. A continued surveillance program detected the fragments at the Ludmilla Treatment Plant which is the catchment for wastewater from more than 10 Darwin suburbs.