For nearly two decades, Public Enemy No. 1 for the food industry and its government regulators has been a virulent strain of E. coli bacteria that has killed hundreds of people, sickened thousands and prompted the recall of millions of pounds of hamburger, spinach and other foods.
But as everyone focused on controlling that particular bacterium, known as E. coli O157:H7, the six rarer strains of toxic E. coli were largely ignored.
Collectively, those other strains are now emerging as a serious threat to food safety. In April, romaine lettuce tainted with one of them sickened at least 26 people in five states, including three teenagers who suffered kidney failure.
Although the federal government and the beef and produce industries have known about the risk posed by these other dangerous bacteria for years, regulators have taken few concrete steps to directly address it or even measure the scope of the problem.
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