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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A Public Health England report estimated 150,000 to 200,000 Britons are infected with the virus by imported pork every year.