At least 60 types of pre-packed sandwiches, wraps and salads have been recalled by major supermarkets because of possible contamination with E. coli.
E. coli bacteria have not been detected in the products, but they are being recalled as a precaution. It is understood these are items containing salad leaves.
Retailers involved include Aldi, Asda, Co-op and Morrisons, according to the BBC.
Some 211 people across the UK are known to be affected by E. coli currently - up from 113 last week.
At least 67 people have been admitted to hospital, the UK Health Security Agency says.
Experts had previously said a continuing outbreak of E. coli was linked to food that was widely and readily available - but had not pinned down specific items.
One of the suppliers involved, Greencore Group, has recalled 45 different products so far.
These include an Aldi chicken fajita triple wrap, Asda smoky beans and cheddar cheese wrap, Boots chicken salad sandwich, Sainsbury's Greek style wrap, Co-op ham and cheese wrap, Morrisons gluten-free sandwich platter and an Amazon prawn layered salad.
Manufacturer Samworth Brothers Manton Wood has recalled 15 products.
These include a Tesco chicken salad sandwich, Tesco tuna crunch sub and Tesco spicy bean wrap.
A third manufacturer is expected to announce a recall today.
Darren Whitby, head of incidents at the Food Standards Agency, said: “This is a complex investigation, and we have worked swiftly with the relevant businesses and the local authorities concerned to narrow down the wide range of foods consumed to a small number of salad leaf products that have been used in sandwiches and wraps."
He added: “Infections caused by [E. coli] STEC bacteria can cause severe bloody diarrhoea and, in some cases, more serious complications.
"We therefore advise any consumers who have any of these products not to eat them."