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FDA Says It's Closer To Finding Source Of E. coli Outbreak

January 14, 2007

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The Food and Drug Administration says it has moved closer to identifying the source of illness for the E. coli outbreak that was traced to several Taco John Restaurants in the Midwest late last year.

The FDA and the state of California, working with state health officials in Minnesota, Iowa, and Wisconsin, have DNA-matched the strain of E. coli O157:H7 bacteria associated with the outbreak with two environmental samples gathered from dairy farms near a lettuce growing area in California's Central Valley.

FDA officials said the investigation is continuing, including obtaining additional samples, to determine if and how material from the dairy farms may have contaminated the lettuce growing area. FDA has no indication that any lettuce currently on the market, including iceberg lettuce, is connected with any consumer illnesses.

Officials said this outbreak is not connected to any previous outbreak.

The outbreak sickened approximately 81 individuals in November and December of 2006, and came on the heels of a serious E. coli outbreak tied to several Taco Bell restaurants in the Northeast. Illnesses were reported in Minnesota (33), Iowa (47), and Wisconsin (1).

Twenty-six people were hospitalized, and two suffered hemolytic uremic syndrome, a serious complication of E. coli O157:H7 infection that can cause permanent kidney damage and death. No deaths have been associated with the outbreak. No new cases of illness are being reported and the outbreak is now considered over.

Taco John's is headquartered in Cheyenne, Wyoming, and has franchises in more than 25 states; however, the outbreak was associated only with Taco John's restaurants located in Iowa and Minnesota.

Epidemiological studies by Minnesota and Iowa health officials had previously identified shredded iceberg lettuce served in the restaurants as the likely vehicle of transmission in the outbreak. FDA was able to focus on specific lettuce growing regions based on the traceback from records obtained from the lettuce processor.

The recent DNA match provides a clue as to one possible source of the contamination for the lettuce, although others may exist. It has yet to be determined how the E. coli contaminated the lettuce. The traceback investigation is ongoing and will hopefully yield further insight into how this contamination occurred.

In the wake of recent outbreaks of consumer illness connected with fresh produce, FDA said it will accelerate its efforts to address produce safety, including consideration of new regulations, if appropriate, to reduce risk of contamination by pathogens.

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