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US doctors on Thursday reported 12 cases of muscle weakness or paralysis among children in Colorado that may be linked to a nationwide outbreak of an usually rare respiratory virus. EV-D68 caused localised outbreaks of respiratory illness in Asia, Europe and the United States from 2008 to 2010. It returned last August in a US-wide outbreak, which as of January 15 had caused 1,153 mild to severe respiratory illness cases, according to the latest figures on the US Centers for Disease Control and Prevention (CDC) website. Reporting online in UK medical journal The Lancet, physicians at the Children's Hospital Colorado examined 12 cases of sick youngsters who had been admitted over a three-month period.