Two schools have experienced transmission on campus since schools returned to face-to-face learning and a total of 13 schools have had a positive COVID-19 case attend while unknowingly infectious.

A cluster of cases associated with Wanniassa School junior campus has grown to 50, which includes household contacts and tertiary infections.

Erindale College also had transmission on site with fewer than five cases linked to the campus.

Dr Coleman said many young people who have contracted the virus did so at gatherings outside of school and then attended school while infectious.

"We did expect that we would see more of our cases move towards children under 12 because of their ineligibility for vaccination at the moment. But it's also why we've done so much work with the Education Directorate and schools about having those plans in place so that we can respond," she said.

"I also think and I've heard so many people talk about how it is important for children to have that social and school interaction. So all of those things put together and reassuringly the evidence that shows us that while children ... will catch the infection that disease is definitely not as frequently causing serious illness."

The median age of cases in the past week to Sunday was 15 years old, down from a median age of 26 to 27 years old for the outbreak since August 12.

In the past week, 68 per cent of cases were aged under 19 years and 42 per cent of cases were under 12 years.

About 50 children under the age of 16 years are in the care of the COVID care at home team and are experiencing mild to no symptoms. No children were requiring hospitalisation, Dr Coleman said.

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Some students and all teachers in schools will need to continue to wear masks indoors, even when restrictions lift for other indoor venues from Friday.

High school and college students and all teachers are required to wear masks indoors while children in year 3 to 6 are encouraged to wear masks at the discretion of their parents.

The guidelines for school end of year events, including graduations and formals, were updated in line with the relaxed restrictions.

From November 12, events will be restricted to one person per two square metres of usable indoor space and any events with more than 1000 people must be ticketed or require pre-registration.

Events with more than 1000 people must submit a COVID-safety plan to ACT Health while those with more than 2000 people need an exemption from the ACT government.

Dancing will be allowed at school formals.

Dr Coleman said the ACT government was planning options for rolling out a vaccination program for children aged 5 to 11.

"Once and if the TGA and ATAGI give the go ahead for that, we have several options available to us, depending on the timeframe of that, depending on whether it's during school holidays or during the school term, so yes, we'll be able to roll that out relatively quickly."

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