Investigators have linked the outbreak of E. coli bacteria in spinach, which killed three people and sickened more than 200 others across the United States, to wild pigs. The pigs could have spread the bacteria by trampling fences around a spinach field in California.
Samples taken from a wild pig, in addition to stream water and cattle from the ranch, have tested positive for the strain of E. coli implicated in the outbreak.
But investigators have not gone so far as to declare the pigs the source, and are still looking at other possibilities, including runoff, flooding, irrigation water, fertilizer and other wildlife, including deer, as possible sources.
The outbreak appears to be over, and no one has become ill from eating contaminated spinach since September 25.