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A public health warning has been issued for city workers who bought food at SumoSalad on Kent Street in Sydney after a staff member was diagnosed with hepatitis A.

Customers who ate salad or sandwiches there between July 19 and 26 are being offered a free vaccine in case they were exposed to the disease.

People who ate there between July 11 and 19 could also have been exposed, but the vaccine would not be effective for them as it must be delivered within two weeks of exposure.