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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Erratic wind and heat gripping a large area of California from San Jose to the Oregon border has been driving the flames.
Calls have been made for the line to remain permanently in public ownership.
Migrants described being rounded up hundreds at a time, crammed into trucks for hours then dropped in the desert and pointed towards Niger.