Traces of COVID-19 wastewater have been detected in the Grampians, almost two weeks after a series of exposure sites were listed in the region.
On Friday October 8 there was an expected detection of COVID-19 in the wastewater.
However on October 15, 18 and 19 there was no COVID-19 detected in the wastewater at Halls Gap.
But on Wednesday October 20 there was an unexpected detection of the virus in the wastewater.
No further wastewater test results have been released yet.
The testing of Halls Gap wastewater comes after a series of exposure sites were listed earlier in October.
The updates come as the Victorian Government confirmed residents in regional Victoria will be allowed to travel to Melbourne, and vice versa, when the state hits the 80 per cent double vaccinated rate on Friday night.
COVID wastewater testing
Testing of wastewater can show if SARS-CoV-2 - the virus that causes COVID-19 - is present in a geographical area or population and Victoria conducts wastewater surveillance and uses testing results with other health data as part of their COVID-19 response.
People who have or have recently had COVID-19 may shed fragments of the virus.
These fragments can enter wastewater through toilets, bowls, sinks and drains.
This viral shedding may come from different sources such as used tissues, off hands and skin, or in stools. This shedding may last for a number of weeks beyond when a person is infectious.