Victoria recorded 41 new cases on Saturday, marking the 11th consecutive day of double-digit rises.
Health workers are going door-to-door in Keilor Downs and Broadmeadows, with mobile testing vans and expanded community engagement teams on the ground.
Residents in the two areas were also sent emergency text messages on Saturday, urging testing.
"We know that cases and outbreaks will continue to occur, and we really are doing our best to keep absolutely on top of them," Deputy Chief Health officer Annaliese van Diemen said.
Eight of the 41 latest cases are linked to known outbreaks, one is a returned traveller, 13 are from routine testing and 19 are being investigated.
Australian Defence Force medical and support personnel are understood to have arrived in Victoria to help the state's efforts.
Victoria is seeking legal advice about making it mandatory for returned travellers to be tested following revelations some had refused the test.
Dr van Diemen sought to allay concerns about the reported 30 per cent refusal rate, saying that figure related to overall numbers since hotel quarantine began but that current refusal rates were lower.
The total number of recorded virus cases in Victoria is now 1987, with 1762 recoveries, and the death toll remains at 20.
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Testing for coronavirus is now widely available across Australia. If you are experiencing cold or flu symptoms, arrange a test by calling your doctor or contact the Coronavirus Health Information Hotline on 1800 020 080.
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