An E. coli outbreak in the UK, linked to contaminated salad leaves in shop-bought sandwiches, has resulted in at least one death and over 250 illnesses.

The UK Health Security Agency has confirmed a total of 275 cases of STEC, with 182 in England.

The outbreak is caused by a type of Shiga toxin-producing E. coli, which can lead to severe illness by inhibiting protein production and triggering immune responses.

Good hygiene practices, proper food preparation, and avoiding unpasteurised dairy products are recommended to prevent infection.

Children and older adults are most at risk of severe complications, including kidney failure.

While the peak of the outbreak may have passed, more cases and deaths are possible.

Leafy salads are a known risk for E. coli infections, making it challenging to pinpoint the exact source of contamination.

The investigation into the outbreak's source is ongoing, with lettuce believed to be the culprit.