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.
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The law should be changed to allow assisted dying, the country's former top lawyer has said.
The victims of the Shoreham air crash will be remembered in a series of events today to mark one week since at least 11 people were killed.
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