Syd bakery closed after 'food poisoning'

A Sydney bakery has been shut down after a suspected food poisoning outbreak left more than a dozen people in hospital.

At least 40 people presented themselves to St George and Sutherland hospitals over the weekend after they consumed food believed to have been prepared at the Box Village Bakery in Sylvania.

Thirteen of those people, including young children, were admitted for further treatment.

Initial tests showed the patients had suffered salmonella poisoning, a NSW Health spokeswoman said on Tuesday.

It's believed several patients had reported eating either chicken or pork rolls from the same southern Sydney bakery.

The NSW Food Authority closed the bakery on Monday after a prohibition order was issued.

The shop will remain closed until an investigation into the incident is complete, a spokeswoman said.

She encouraged anyone who may be feeling ill to get in touch with a health professional and register a complaint with the Food Authority.

Salmonella symptoms include diarrhoea, vomiting, fever, nausea, headache and stomach cramps and can start between six to 72 hours after the bacteria is ingested.

The bakery's operators were being sought for comment.