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As the outbreak grows to 59 cases, officials puzzle over why romaine and not other lettuce was tainted.
The CDC notes 11 more illnesses, raising the outbreak total to 43 cases in 12 states.
So far 32 illnesses have been confirmed in 11 states, as well as 18 cases in Canada.
Investigators were't able to determine exactly how the water contaminated the lettuce, which may have occurred by irrigation or the dilution of chemical to protect crops.
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