To date, there have been eight cases in Ireland, according to FSAI.

The investigation seeks to establish the source of the illness and laboratory testing of foods is being carried out which should provide further information shortly.

FSAI is continuing to investigate all other potential sources of contamination. In the meantime, as a precautionary measure, a company that supplies implicated ingredients into the catering sector has withdrawn these products from sale.

The Authority is advising food outlets providing ready-to-eat sandwiches to be particularly strict in adhering to best hygiene practices. It reminds retailers of the importance of ensuring that hot sandwiches must be thoroughly cooked before serving to the consumer. It also reiterates the need for strict procedures to be followed at all times to avoid cross contamination between raw and cooked foods.

FSAI is working closely with the Department of Health & Children, the Department of Agriculture, Fisheries & Food and the Health Protection Surveillance Centre, as well as the relevant agencies in the UK.

As the investigation is ongoing, the FSAI will provide more information as it becomes available.

Reporting on the FSAI announcemnet, Irish Times says it is thought the outbreak involves meat and poultry products.