More than 90 Victorian prisoners have been diagnosed with the flu or with "flu-like symptoms" as health authorities warn an outbreak has affected more than 3,400 people across the state.

A corrections source told the ABC convicted child sex offender George Pell was among those taken to hospital, but the Victorian Department of Justice said otherwise.

There has been 19 confirmed flu cases in Victorian prisons with 73 prisoners presenting "flu-like symptoms" and 13 confirmed cases at the Metropolitan Remand Centre at Ravenhall.

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