COVID-19 booster shots will be critical in Canberra where there are low levels of herd immunity, new research shows.
Research, published in the New England Journal of Medicine, found Pfizer vaccines offered at least 90 per cent protection against severe COVID-19 cases for at least six months.
However, six months after the second Pfizer dose the vaccine offered less than 20 per cent protection against milder infections of the virus.
More cases have been linked to an outbreak at Wanniassa School's Junior Campus, ACT Health said on Tuesday night.
It follows closures at Ainslie School and three Queanbeyan schools, while Deputy Chief Health Officer said deep cleaning would be less important at school exposure sites.
Meanwhile, children in the ACT's Indigenous community have been disproportionately affected by the territory's COVID-19 outbreak, health authorities have revealed.
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