Duck eggs are suspected of causing an outbreak of salmonella which has struck down dozens of people and may have killed a pensioner.

An investigation into 66 cases of a virulent strain of the stomach bug during the past nine months has found many of the victims had eaten duck eggs as well as evidence of contamination in duck farms. One elderly person with Salmonella typhimurium DT8 has died during the outbreak, which has peaked in recent weeks.