The first three victims died after eating chicken sandwiches contaminated with listeriaKATARZYNA BIALASIEWICZ/GETTY IMAGES

An urgent review of hospital food has been ordered following the deaths of five people that have been linked to listeria poisoning in sandwiches and salads served at NHS hospitals.

Public Health England (PHE) confirmed yesterday the total number of deaths related to pre-packaged products had risen from three, and a total of nine cases of poisoning had been confirmed.

Matt Hancock, the health secretary, last night said he was “incredibly concerned” and had ordered a “root and branch” review of NHS food.

The first three victims died after eating chicken sandwiches contaminated with listeria at Manchester University NHS Foundation Trust and the Aintree University Hospital NHS Foundation Trust in Liverpool.

PHE did not name the hospitals where patients had survived the poisoning and said…