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The outbreak of serious respiratory illness in children was a big surprise; it was caused by an obscure virus rarely seen in the U.S. Two doctors on the front lines explain what they've learned.
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Several dozen children in California and Colorado have suffered paralyzed limbs, which doctors speculate could be caused by the respiratory virus EV-68. But we're a long way from knowing for sure.
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The rare virus is spreading fast, and doctors don't have an instant test to find out who has it. So parents should be ready to seek help quickly if a child has a cold that's rapidly getting worse.