There are currently three people in Canberra hospitals because of coronavirus, including one person in ICU requiring a ventilator.

The vaccination rate of ACT residents aged 12 and over has reached 96.6 per cent, according to ACT Health.

Health authorities have predicted an increase in cases of coronavirus after Christmas, as Canberra students return to school.

ACT chief health officer Dr Kerryn Coleman said the low numbers currently being reported was impressive, however, an increase was likely in the new year.

"The very high vaccination level that we have achieved here and that NSW is achieving is something that is unprecedented and we're really charging ahead in uncharted waters at the moment," she said.

"It's very promising, but we do still need to be careful.

"I still think we will see an increase in cases post the Christmas and January school holidays and would probably anticipate that once school goes back next year."

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Authorities are continuing to battle growing outbreaks among Canberra schools and a cluster at an aged care facility.

There are now five schools where transmission has been identified. There have been 56 cases linked to Wanniassa School and nine cases linked to Duffy Primary School. Erindale College, Mawson Primary and Orana Steiner School have all had fewer than five cases.

A total of 20 schools have been affected by a COVID case since November 1.

There are no new cases associated with St Andrews residential aged care in Hughes. There have been five cases associated with the site and Dr Coleman said both staff and residents had tested positive. She said while it was a concern the high levels of vaccination were reassuring.

"We have very high levels of vaccination in both residents and staff and I think this is one of the things we need to get used to as part of COVID normal," she said.

"Any infectious disease in an aged care facility is a concern but it is reassuring that there has been limited spread so far."

Dr Coleman said personal responsibility, particularly as the territory would seek to wind back some public health directions as the ACT moves further towards COVID-normal.

The ACT has also changed how hospitalised cases are reported to include people who have been cleared from isolation.

It emerged last week that authorities only counted people in hospital who had an active case of the virus, regardless of whether they were still being treated from symptoms of the COVID-19.

But figures will now include every patient regardless of whether they have an active case or not following a resolution from national cabinet last week.

Today's numbers come as NSW reports an increase of coronavirus cases again on Wednesday.

NSW recorded 231 new COVID cases in the 24 hours to 8pm, up on yesterday's 212 cases, however, no deaths have been recorded in this period.

Premier Dominic Perrottet has warned case numbers and hospitalisations will increase, pointing to the European experience as that continent approaches winter.

The state is creeping closer to its target of 95 per cent double-dose vaccination, with 94.2 per cent of people over 16 having had at least one jab. More than 91 per cent of adults are fully vaccinated.

Meanwhile Victoria has recorded 996 new COVID-19 cases and nine deaths.

Hospitalisation numbers continue to decline in the state, which is now managing 14,260 active coronavirus infections.

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