The case was announced at the Victorian Premier's daily press conference on Friday morning.
At the time, Deputy Chief Health Officer Allen Cheng said a special committee was examining the rogue case.
The false positive is a win for regional Victoria, with the Premier hinting that stage three lockdown could be eased as early as next week. As of Friday there was 74 cases in regional Victoria.
Those in the Echuca area are being encouraged to come forward for testing with even the mildest cold or flu symptoms.
Echuca Regional Health operates a COVID-19 Screening Clinic at its hospital, seven days a week, from 9.30am - 6pm, access via the Emergency Department on Service Street.