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A recent
Consumer Reports investigation has revealed that bagged salads labeled "pre-washed" or "triple-washed" may not be as clean as they appear. Of the 208 samples taken from 16 different brands of bagged salad, researchers found that nearly 40 percent of them were tainted with bacteria often found in fecal material.
The tainted salads were not contaminated with more serious bacteria like
salmonella or
E. coli, but 39 percent of them did contain coliform levels that exceeded 10,000 colony forming units per gram (CFU/g) and 23 percent of them contained enterococcus levels exceeding 10,000 CFU/g. Industry experts generally agree that acceptable levels of these types of bacteria for leafy greens should be below 10,000 CFU/g.
Coliform bacteria does not necessarily come from feces, but high levels of the types found in some bagged salads does suggest that poor sanitation practices likely caused fecal contamination. A few of the samples tested fell into this category, having coliform levels of up to one million CFU/g.
"Although these 'indicator' bacteria generally do not make healthy people sick, the tests show not enough is being done to assure the safety or cleanliness of leafy greens," said Dr. Michael Hansen, publisher of
Consumer Reports.
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