A family who claim they were served tainted gelato at a Sydney pub say they are not surprised a sample of the dessert tested positive for faecal matter.
State Primary Industries Minister Ian Macdonald said preliminary results of laboratory tests by the NSW Food Authority showed the sample tested positive for bilirubin, found in excreta.
He said further DNA analysis would now take place to determine if the sample was of "human or animal origin".
Those results are not expected for a number of weeks.
"Obviously, we are keeping an open mind and do not want to pre-empt this investigation in any manner," Mr Macdonald said in a statement on Wednesday.