Patients contacted after health worker diagnosed with hepatitis

VICTORIA'S top health officer says the chance of someone contracting hepatitis B from an infected Melbourne healthcare worker is less than 1%.

The Department of Health and Human Services is contacting 654 patients in Melbourne following the diagnosis of hepatitis B in the health worker.

"(But) my professional judgment here is that the risk is going to be less than one per cent and that's based on historical investigations of this nature in other countries," acting chief health officer Dr Ross Taylor told 3AW on Thursday.