Reports of a link between contaminated fresh produce and a gastro-intestinal bug are too early to confirm and direct people away from foods that have no proven risk, according to the Ministry for Primary Industries.

Public health services across the country have been reporting cases of illness associated with the bacteria Yersinia pseudotuberculosis, with 101 people affected country-wide and a further 41 suspected cases.

A total of 38 have been hospitalised, and in the Bay of Plenty there have been five confirmed cases of the illness.

Yersinia pseudotuberculosis causes stomach cramps and presents symptoms similar to appendicitis, with diarrhoea resulting on rare occasions.

Reports suggest the outbreak is due to contaminated fresh fruit and vegetables, prompting health officials to issue a warning around personal hygiene and washing food.

It is thought the bacteria is linked to bagged carrots and lettuce, but an MPI spokesperson says it is still too early to confirm the exact cause and the organisation has been notified by Environmental Science and Research of the illnesses linked to the bacteria.

It's important to note that MPI's investigation is over a range of foods and attempts to steer consumers away from foods that have no proven risk are premature.

MPI is working to determine the source of the outbreak, but at this stage the source hasn't been identified.

Outbreaks overseas have been linked to contaminated fresh vegetables and fruit, contaminated water and animal contact. Person-to-person spread is uncommon.

'We believe there is a credible link that food is the likely source,” says the MPI spokesperson, 'but it is too early to be certain about the source of this pathogen and direct people away from foods that have no proven risk for consumers.

'The people who have become ill with Yersenia have been interviewed on what foods they have been eating and this information has been cross-referenced, giving us sources to investigate further.”

Horticulture New Zealand communications manager Leigh Catley says alongisde Vegetables New Zealand, they have been working closely with MPI to understand the level of risk associated with the spread of the bug, and aim to provide as much support and advice to growers as possible.

People are advised to apply normal food safety practice. If it looks off or smells off, throw it out. Otherwise keep fresh food chilled and always wash fruit and vegetables before eating.