Around 15,000 people were tested for the coronavirus on Friday, and another 8,977 received vaccine doses.

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On Friday, Victorian health authorities amended a COVID-19 exposure site after they had listed the wrong supermarket.

People had been warned of potential virus exposure at Woolworths in Epping a fortnight ago, but the health department now said a man with the virus actually shopped at Woolworths Epping North.

Anyone who was at Woolworths Epping North on Saturday, May 8, between 5.40pm and 6.38pm must get tested and isolate until they receive a negative result.

The health department said the previous listing was "an error".

The warning comes as Victorian Chief Health Officer Brett Sutton said there may be an active but undiagnosed infectious coronavirus case in Melbourne's north.

Traces of COVID-19 were picked up in wastewater in the Epping and Wollert area on Thursday.

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Prof Sutton said the detection of virus in wastewater was notable due to the public exposure sites in the area.

He said however it could be due to someone who is no longer infectious continuing to shed the virus.

Authorities urged anyone to get tested immediately if they had symptoms of COVID-19 such as fever, cough, sore throat, runny nose, chills, sweats, or a change in sense of smell or taste.

- with AAP

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