The outbreak has been linked to 6 severely sick patients, three of whom died at Aintree College Sanatorium and Manchester College NHS Basis Trusts.
Public Health England said six patients became sickened after eating pre-packaged sandwiches and salads manufactured by the Good Food Chain.
According to the company's website, it has provided hospitals, universities, sports venues, as well as business and industry with food for the past 20 years.
"Following investigations by Public Health England and the Food Standards Agency, The Good Food Chain has confirmed that its production facility in Stone, Staffordshire was cross-contaminated by an ingredient from one of its approved meat suppliers", the company said in a statement to CNN.
He added that there have been "no associated cases identified outside healthcare organizations", and said the risk to the public was low. Currently, there are no cases in Scotland, Wales or Northern Ireland.
'We, alongside with the FSA, colleagues in local authorities and the NHS bear worked mercurial to search out out the seemingly explanation for this outbreak and brought motion to decrease the possibility to the public's properly being.
Nick Phin, an infection specialist at PHE, said that in this outbreak, the risk of further cases was relatively low, as was the risk to the general public.
Sandwiches and salads affected are not being produced while investigations continue and products were withdrawn from hospitals when the link to the Listeria infections was identified.
Colin Sullivan, chief operating officer at the FSA, said his agency had taken action alongside local authorities to "minimize the risk based on the evidence so far". The FSA will proceed to analyze how the outbreak took place and if further steps are required to offer protection to vulnerable teams'.
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