I was talking with William Newman from the New York Times as he was writing his story on “Tainted Lettuce Linked to Illness in Three States,” when he asked about prior E. coli O145 outbreaks. I was able to pull out of my hat:
“William Marler, a lawyer specializing in such cases, said that

Although Yuma has not been linked to an "leafy green" E. coli outbreak in the past – O157:H7 or otherwise – like O145, it is not like Yuma is risk free – it has more than a few cattle feedlots and is a major flyway for migrating birds. It also has the "All American Canal." 
As
Public health and agriculture officials are investigating six cases of salmonella they believe were caused by drinking unpasteurized milk. Milk samples are being tested for the bacteria at the state’s public health lab, with results due next
The Outbreak
E. coli outbreaks, primarily of the O157 variety, have been associated with lettuce or spinach, specifically “pre-washed” and “ready-to-eat” varieties, and are by no means a new phenomenon. By way of illustration: