The Malmsbury Youth Justice Centre is in lockdown following a worker testing positive to coronavirus at the weekend.
An education co-ordinator from the Department of Education working at the centre returned a positive test.
All staff who have been identified as close contacts have been told to self-isolate.
The Department of Justice and Community Safety (Malmsbury) confirmed the centre is still in lockdown this afternoon and contact tracing has begun.
A department spokesperson said the centre has been deep cleaned.
“Youth justice has implemented a range of measures in response to the coronavirus, including screening questions, temperature testing for visitors, staff and young people, quarantine measures and testing as required in accordance with health advice,” the spokesperson said.