The bacterium that has sickened people across the nation and forced growers to destroy spinach crops is so pervasive in the Salinas Valley that virtually every waterway there violates national standards.
"There are many sources of water coming into the watershed, and I guarantee you that they all have generic \o7E. coli\f7," and many carry the deadly \o7E. coli \f7strain linked to food poisonings, said Christopher Rose, an environmental scientist at the state's Central Coast Regional Water Quality Control Board, which tests the region's waterways.
Federal officials said Wednesday they are focusing on nine fields in San Benito, Santa Clara and Monterey counties as possible sources of the bacteria-contaminated spinach that killed one woman and sickened at least 145 others in 23 states.
Investigators also announced that spinach found in the refrigerator of a New Mexico resident who became ill tested positive for \o7E. coli \f70157:H7, the dangerous bacteria strain responsible for the outbreak. The finding confirmed suspicions that the tainted spinach originated from California's Central Coast, where it was packaged by Natural Selection Foods under the Dole label.
Monterey County's Salinas Valley is one of the world's most intensely farmed regions and a major supplier of lettuce and spinach to the nation. The current outbreak of food poisoning marks the 20th time since 1995 that the dangerous \o7E. coli \f7strain has been linked to lettuce or spinach.
The source of the pathogen has not yet been pinpointed, but tainted water is considered a likely culprit.
Many creeks and streams near the region's spinach fields, including the Salinas River, Gabilan Creek, Towne Creek, Tembladero Slough and Old Salinas River Estuary, are known to be carriers of the \o7E. coli \f7strain implicated in the food poisonings. When consumed, people experience cramping, diarrhea and, in severe cases, kidney failure.
Although the growers do not draw water from creeks to irrigate their fields, their crops could be tainted by runoff from nearby livestock operations or Central Coast urban areas.
"What is troublesome with this particular watershed is that it has low-lying land in agricultural production, and flooding certainly occurs in the lower portions. If we have high levels of \o7E. coli \f7in surface waters and they are flooded onto fields, that is certainly a potential source of contamination," Rose said.
