Sexually active gay men have been warned to watch for hepatitis A symptoms after further Sydney outbreak cases were confirmed.
There are now 22 cases linked to the infection with at least six associated with public sex venues in Sydney, NSW Health's Dr Vicky Sheppeard said in a statement on Wednesday.
"Men who have sex with men are a high-risk group for hepatitis A infection, and vaccination is the best protection against the disease," Dr Sheppeard said.
Anyone who has visited public sex venues in Sydney between July 29 and September 12 has been urged to visit a doctor if they start to show symptoms of the infection.
NSW Health is continuing to work with the NSW Food Authority to determine whether a food source is the cause of the outbreak.
The latest warning follows a similar alert in Victoria after four cases were confirmed and were believed to be spread by travellers from Europe who have had male-on-male sexual activity.