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
The US has confirmed that it is investigating claims that dozens of civilians were killed by a coalition airstrike targeting IS in Mosul
The breeder thought little Bea would not sell because of her disability.
The four people killed in Wednesday's terrorist attack in London have been honoured by silences across the country.