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Associated Press
FILE - In this Wednesday, June 4, 2008 file photo, a woman holds up a syringe with symbolic green fluid during a rally on Capitol Hill in Washington calling for the elimination of what demonstrators say are toxins in children's vaccines.  Parents have been nervous about vaccines for as long as vaccines have been around.  Opposition seemed to plummet for several decades, as vaccines got better and succeeded in beating back diseases, but parental concern has seemed to be on an upswing in the last 20 years.   (AP Photo/Jose Luis Magana)

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