Government scientists perplexed over sudden spread of severe, polio-like illness

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The Centers for Disease Control and Prevention has been unable to get to the bottom of the sudden spike in a rare illness that paralyzes children.

“I am frustrated that despite all of our efforts we have not been able to find the cause of this mystery illness,” Dr. Nancy Messonnier, director at the CDC’s National Center for Immunization and Respiratory Diseases, said in a call with reporters Tuesday.

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