A polio-like illness has infected as many as 20 California children in the last 18 months. It causes weakness in limbs and paralysis. One family described to Stephanie Elam how fast their child's symptoms set in and what they are doing to help him regain the full function of his arm.
Chief Medical Correspondent Dr. Sanjay Gupta talks to Anderson about why we are just hearing about this illness now.
Anderson Cooper goes beyond the headlines to tell stories from many points of view, so you can make up your own mind about the news. Tune in weeknights at 8 and 10 ET on CNN.
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