A total of 124 cases of a painful epidemic of food poisoning have been confirmed nationwide, however it is yet to be confirmed what foods are the causing the nasty stomach bug.
The Ministry for Primary Industries (MPI) said they are continuing to interview those who have become ill with yersinia pseudotuberculosis.
MPI said it was asking those suffering from the bug what foods they had been eating and then cross-referencing the information, giving sources to investigate further.
It was important for consumers to note the ministry's investigation was over a range of foods, MPI said.
Earlier this week it was reported the stomach bug was related to consumption of packaged carrots and lettuces, however this was yet to be confirmed.
Read more: Carrots and lettuce cause outbreak in Bay
MPI advised consumers to beware of stomach cramps, which may mimic appendicitis.
Diarrhoea can occur but was rare, and the bug has a incubation period of three to 21 days, MPI said.
Consumers were also encouraged to apply normal food practice.
MPI said if food looked or smelled off it should be thrown out, otherwise fresh food should be chilled and fruit and vegetables washed before eating.