It marks the 49th day without new locally acquired infections in the state.

There were no new infections from interstate or overseas.

More than 14,700 test results were received.

All eight known active cases were acquired overseas, and all are in hotel quarantine.

Among them are a woman in her 20s, a man in his 20s, two young children, and an international air crew member.

Prime Minister Scott Morrison has warned COVID-19 cases in Australia will increase once international borders re-open.

"Australians would have to become used to dealing with a thousand cases a week or more," Mr Morrison told 6PR Radio.

It comes as airlines look to resume international travel.

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More than 158,498 vaccine doses have been administered in Victoria, with 3265 jabs in the 24 hours to midnight.

Further viral fragments have been detected in Melbourne wastewater, with the health department adopting a "cautious approach".

It has advised people who have been in the following areas on the following dates to monitor for COVID-19 symptoms and get tested if they develop.

They include Cranbourne and surrounds from April 6 - 12, and Melbourne's north, west and eastern suburbs from April 4 - 12.

"This detection is in a very large catchment that services suburbs stretching from Melbourne's north-west to the outer north-east," the department said.

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Viral fragments had earlier been detected in wastewater from the Ringwood area.

Anyone in the following suburbs from April 6 - 9 is urged to get tested for even the mildest of COVID-19 symptoms: Bayswater, Bayswater North, Boronia, Croydon, Croydon North, Croydon South, Heathmont, Kilsyth, Kilsyth South, Montrose, Ringwood, Ringwood East, Sassafras, The Basin, Tremont and Wantirna.

Metropolitan wastewater sampling sites are mapped on the health department's website.

The Prime Minister has warned against rushing to conclusions following the death of a diabetic New South Wales woman, who developed blood clots a day after receiving a COVID-19 vaccine.

"It has not yet been established whether there is any link between the COVID-19 vaccine and the tragic death reported by NSW health officials," the Therapeutic Goods Administration said in a statement.

"NSW Health has said there is no confirmed link but further investigations are underway."

Central Victorian health workers are urging people over the age of 50 to keep booking for the AstraZeneca COVID-19 vaccine.

- with AAP

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