A patient has tested positive for the same rare strain of listeria that contaminated sandwiches provided to hospitals across London and the southeast, the Health Protection Agency (HPA) has revealed.

The patient, who is believed to have had a weakened immune system, reported eating a sandwich which looked like those provided by Kent-based firm Anchor Catering.

The strain of listeria he was diagnosed with is uncommon and the agency says it is “very likely” he was infected by an Anchor sandwich.

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