People who have eaten at the popular Melbourne restaurant Cumulus Inc in the past three weeks are advised to get a free hepatitis A vaccine, after a staff member became sick with the disease.
The Department of Health was notified of the man's illness late Wednesday.
He was described as being a "food handler".
Hepatitis A is a viral infection of the liver that occurs when it is ingested and is passed on in faeces.
Anyone who ate at the Flinders Lane restaurant between February 26 and March 19 should visit their GP for a free vaccine and should be on the look-out for any symptoms.
"The symptoms of hepatitis A are fever, nausea, vomiting and abdominal discomfort, dark urine, yellow skin and eyes (jaundice)," Dr Finn Romanes of the health department said.
Dr Romanes said the department was getting the details of people who booked at the restaurant from February 26 and anyone who ate there up until March 19 should seek a hepatitis A vaccine.
"Based on the incubation of this virus we could see additional cases in people who were exposed, with symptoms beginning 15-50 days later," he said.
"An extensive clean-up of the restaurant is being conducted in accordance with our guidelines."
None of the other workers at the restaurant have become sick.
People with hepatitis A can pass the disease onto others from about two weeks before they begin to feel sick and until one week after the appearance of jaundice.
