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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.
The CDC said only one third of the cases were linked to two major outbreaks and that it is exploring if a change in testing practices contributed to more detections.
Fifty-seven people have fallen ill with salmonellosis, while Listeria has caused 1 death.
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CIDRAP - Center for Infectious Disease Research and PolicyOffice of the Vice President for Research, University of Minnesota, Minneapolis, MN
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