The Health Protection Agency said the latest case brings the total to 21. The patient, who is being treated at the University Hospital of North Staffordshire, is a man in his 70s.
Two patients being treated for the disease since the spate of illnesses began in the middle of July have died.
More top news
A convict recaptured by police after three weeks on the run made a dry run the night before he broke out of a New York prison.
Teachers at a school in Northamptonshire made a unique farewell gift for their Year 11 leavers.
The advertising watchdog has ruled the "beach body ready" campaign was not offensive or socially irresponsible.