Premier Daniel Andrews said any decision on whether to lock down the entire state would be based on the caseload and an assessment of the individual circumstances of each positive case.

He said controlled outbreaks may show spikes in infection rates “but it wouldn’t necessarily tell you the full picture”.

The Premier said comprehensive contact tracing was crucial.

“The quicker you can find those people, lock them down, have them tested, that's how you can bring control to something that might look numerically significant,” he said.

Of the 27 active cases in regional Victoria, there are five in Greater Geelong, four in Greater Bendigo and three each in Baw Baw, Bass Coast and Greater Shepparton.

There are two in Moorabool, and one each in Campaspe, East Gippsland, Macedon Ranges, South Gippsland, Surf Coast, Swan Hill and Warrnambool.

Mitchell Shire, which is not part of metropolitan Melbourne but which is part of the lockdown because of its higher infection rate, currently has 12 active cases.

On Monday Bass Coast Health chief executive Jan Child called for understanding as local cases increased.

“This is not the time for people to blame others or throw vitriol at each other over social media or in public,” she said.

“This is not about people who come to visit or people who live here. Everyone is vulnerable and everyone needs to do the right thing.”

Ms Child said there were no COVID-19 patients at its health sites at Wonthaggi Hospital or on Phillip Island and no staff had tested positive.

She said no Bass Coast Health staff had tested positive.

“However, just as we predicted several days ago, there is a likelihood that our region will have positive cases now and into the future – we are not immune to community transmission.”

The West Gippsland Hospital is also testing staff after one employee returned a positive test.

This week the Australian Medical Association’s Victorian branch called for testing sites to be set up at checkpoints bordering Melbourne to protect regional parts of the state.

But the Transport Workers Union Victoria Tasmania branch secretary, John Berger, said truck drivers were an essential service delivering food, fuel and medicine during the pandemic.

“Bureaucrats must ensure the vital service transport workers provide is kept front of mind when making decisions around the border crossing and transport infrastructure,” he said.

Of the 1612 active cases in Victoria on Monday, 1549 were in locked-down parts of the state (Greater Melbourne and Mitchell shire), 27 were in rural or regional Victoria and the location information for the rest was not yet known.

The rate of coronavirus infection is about 31 active cases per 100,000 people in locked-down areas, and about two active cases per 100,000 for the rest of the state.