Three deaths are being investigated as part of the Listeria outbreak associated with the dessert supplied to NHS hospitals and care houses.

The UK Health Security Agency (UKHSA) confirmed that it was investigating two non-telling cases between May and December last year along with deaths.

One death was recorded as listeriosis. Two other people were known to be infected with Listeria bacteria at the time of his death.

Bacteria were detected in a chocolate and vanilla mousse and a strawberry and vanilla mousse, both were supplied by the cool delicate desserts, the UKHSA said – although they have not been confirmed as a source of infection.

The PA news agency reported that the threshold of Listeria found in the dessert was known to go down from the legal threshold, which could tolerate healthy people.

The Food Standard Agency said that the dessert was being removed from the supply chain as a precaution while continuing the investigation.

The age of five patients was between 68 and 89. All had a built -in health status and were in the hospital at the time of infection.

Treatment was done from May to December 2024, two in Yorkshire and Hambar, one in the northwest of England, the second in West Midlands and one in Wales.

Lysterosis is a rare infection caused by eating food contaminated with Listeria bacteria. The outbreak was discovered in February 2025 as part of a regular surveillance at an NHS hospital in the southwest.

Gastrointestinal infection in Britain’s Health Protection Agency, Deputy Director for Food Security and a health, Dr. Gauri Godbol said that the NHS Trust and those who took care to the weak were advised to stop the service of these desserts while the investigation was going on.

He said that most of the people affected by listeoosis will not experience any symptoms or light diarrhea which decreases in a few days.

“People who are severely more unsafe like immunocomomized or advanced older people can be a risk of serious illness such as meningitis and life-drank sepsis.”

Lysterosis in pregnancy can cause very serious illness in mothers and their children and in infants up to a month.

According to NHSListeria can contaminate a wide range of foods, but most infections are caused by eating cold, prepared-to-eating foods.

The BBC has contacted Cool Delight Desert and NHS for comments.