One patient has died and 15 more people have contracted Legionnaires’ Disease in an outbreak in Stoke-on-Trent, reports the BBC.

However, three patients have been discharged and no new cases of Legionnaires’ Disease have presented themselves within the last 24 hours, health officials said. A Health Protection Agency spokesman said eight people remain in hospital, all in a stable or improving condition.

Another patient, transferred to hospital in Leicester, remains in a critical but stable condition.

The source of the outbreak, first announced on Tuesday, has not yet been traced. The HPA is working with the Health and Safety Executive, the NHS in Stoke-on-Trent and the city council to try and find the source.