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Health authorities have confirmed a fresh local case of Covid-19 in Melbourne.
The man in his 30s quarantined in South Australia after returning to Australia from overseas.
He returned to his home in the Melbourne suburb of Wollert on Tuesday last week and developed symptoms on Saturday.
He has since returned a positive result after getting tested on Monday.
The Health Department says it has arranged urgent testing to confirm the result and until then it is treating the man as a positive case.
He is being interviewed by contact tracers and authorities are verifying exposure sites, while his close contacts are also being tested and interviewed, and are in isolation.
The man is also isolating at home.
The department says it is working with interstate authorities to try to determine the source of the infection.
The news comes just as the state had notched up 73 days with no local cases.
Meanwhile Victoria Police officers are in isolation after rescuing a man believed to have jumped from an oil tanker in Melbourne.
The 31-year-old Georgian national was rescued in Port Phillip Bay on Sunday night, about 5km from where the international tanker had docked.
The man is expected to be transferred to mandatory quarantine once released from hospital.
The police air wing found the man clinging to a navigational marker.
The water police officers who rescued the man then went into isolation as a precaution.
Victoria Police would not disclose how many officers are isolating, citing operational reasons.