Salient part of today's Vic DHHS Report. My bolding.
Media Release
27 September 2020
Victoria has recorded 16 new cases of coronavirus since yesterday, with the total number of cases now at 20,145.
Within Victoria, 15 of the new cases are linked to outbreaks or complex cases and one is under investigation. My comment: So as I noted earlier only one potential unknow local case today, and it may yet be traced to become known.
Of today's 15 cases linked to outbreaks, 10 are linked to aged care (three at Baptcare Wyndham Lodge, three at Opal Hobsons Bay, two at Embracia Moonee Valley, and one each at Estia Keilor and Doutta Galla Woornack) and four are linked to a complex case. One case has links to both this complex case and Baptcare Peninsula View in Frankston.
Of today's 16 new cases, there are five cases in Frankston, four cases in Hobsons Bay, three cases in Brimbank and Wyndham and a single case in Melton.
There have been two new deaths from COVID-19 reported since yesterday. Two men in their 70s. One death occurred prior to yesterday.
One of today's two deaths are linked to a known aged care facility outbreak. To date, 784 people have died from coronavirus in Victoria.
The average number of cases diagnosed in the last 14 days for metropolitan Melbourne is 22.1 and regional Victoria is 0.6. The rolling daily average case number is calculated by averaging out the number of new cases over the past 14 days.
The total number of cases from an unknown source in the last 14 days is 31 for metropolitan Melbourne and zero for regional Victoria. The 14-day period for the source of acquisition data ends 48 hours earlier than the 14-day period used to calculate the new case average due to the time required to fully investigate a case and assign its mode of acquisition.
My comment: What seems to be really stopping the new cases dropping to single digits are the surprising ongoing aged care cases that keep occurring most days. I say surprising as one would imagine that there are a lot of controls in this sector at present. The commentary does not flag the break-up of the aged care cases each day though (ie Staff, residents of others). It could also being amongst the elderly that it also takes longer for cases to show up in positive testes.
It could also be that there are actually higher levels of unknown cases in the general community but that a high level surveillance testing on aged care staff more readily identifies the infections in this cohort.