Bruce Hall, Wamburun Hall and Toad Hall have gone into lockdown, with the ANU providing support to help students cope during the isolation period.

It comes less than 24 hours after the university thought it was clear of Covid concerns when all students who were deemed close contacts of an earlier case tested negative.

Eight campus residences were initially sent into lockdown last week when about a dozen students were deemed close contacts.

Wamburun and Toad Halls have now been added to the list, with close-contact residents moved into self-contained apartments in the hope of preventing any spread.

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"All other residents are deemed a secondary contact and have been asked to remain in their rooms until the University and ACT Health confirm there are no positive COVID cases in the residences," an ANU spokesman said.

"The students are being supported by ANU with food deliveries and other pastoral and academic support."

A Lyneham High School student tested positive on Sunday night and more cases are expected to be announced by ACT Health on Monday morning.

ACT Health has closed the Dickson walk-in centre to redeploy staff to Covid testing sites around Canberra in anticipation of exposure site continuing to grow.

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