Meanwhile, on Dec. 28, AAP reported two additional cases; the infection of a woman in her 20s and a child aged 10.
The new cases were reportedly amongst returning travellers and was detected in hotel quarantine.
Of the reported 11 active cases, 10 are in hotel quarantine.
The other is a teenage Melbourne girl who continues to isolate at home after contracting the virus while visiting an infection hotspot in the neighbouring state of New South Wales earlier this month.
Some 5,880 COVID-19 tests have been conducted since Sunday and wastewater monitoring continues at more than 60 sites across the state.
Health authorities said the response to calls for testing in the past week had been "excellent," with more numbers than expected before Christmas.
Meanwhile, the federal health department has issued advice for people planning to travel interstate to be aware of the local COVID-19 restrictions in each state.
"COVID-19 restrictions differ between state and territories. If you’re planning to travel, make sure you stay up to date with local advice," the department wrote on Twitter on Dec. 28.
The advice site links to the relevant advice from each state and territory.
Advice includes information about what you can and can't do in each state, including information about visitors allowed at residences; weddings, funerals, and religious services; hospitality venues, events, and musical activities; sport and recreation; travel restrictions; and restrictions on businesses.