Associated Press:  Berlin - European health officials tracking one of the worst E. coli outbreaks on record might never know where it came from.  Its a sad fact of life in food poisoning cases: There is often no smoking gun.  Germany's national health agency said Wednesday that more than 1,530 people there had been sickened by a dangerous E. coli germ, including 17 dead, 470 suffering from a kidney failure complication that was previously considered rare.  Most patients who have been intervi...
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