NSW Health has warned Sokyo diners that a staff member, who was handling the food at the Japanese restaurant on certain nights in September and October, has been diagnosed with Hepatitis A.

If you dined at the restaurant, located at The Star, on the nights of September 20, 21, 22, 23, 24, 26, 27, 29, 30 or October 1, 2, 4, 5, 6, 7 and 8, you may have been exposed to the virus, though NSW Health says the risk of developing the infection is low. Diners are advised to visit a doctor if concerned.

Authorities believe the staff member contracted the infection on a recent overseas holiday. Sokyo is continuing to operate as normal.

“It is an isolated incident at this stage and NSW Health has issued a low level alert for dinner guests who visited the restaurant on various dates from 20 September to 8 Octobe.,” The Star said in a statement. “The NSW Food Authority has also confirmed the processes and hygiene systems at Sokyo are robust after completing a comprehensive review of the restaurant. There is no ongoing risk to diners.”

Hepatitis A is a viral infection of the liver, bringing on a loss of appetite, nausea, fever and stomach cramps, followed days later by dark urine, pale stools and jaundiced skin.

“There is a safe and effective hepatitis A vaccine available through GPs for those who are worried," said NSW Health's director of Communicable Diseases, Dr Vicky Sheppeard, in a statement. "But the hepatitis A vaccination is not considered necessary on the basis of this low-risk exposure.”

There is no specific treatment for hepatitis A, but two doses of hepatitis A vaccine, six months apart, provides lifetime protection.

Visit the NSW Health website for more information.