Only a quote will do:
“Reinhard Burger, president of the Robert Koch Institute, said even though no tests of the sprouts from an organic farm in Lower Saxony had come back positive for the E. coli strain behind the outbreak, an investigation into the pattern of the outbreak had produced enough evidence to draw the conclusion.”
One thing this article does not mention is a study or observation of the food handling and storage conditions.
After damaging the businesses of produce farmers, it’s now said to be OK the lettuce, tomatoes and cucumbers.
But don’t eat the sprouts, even though none are shown to be tainted with the virulent form of E. Coli.
Sorry…. more quotes. “Also, since it has not yet be established why the sprouts were bad – whether the seeds had been contaminated or the farm’s water – the experts said it was possible that other nearby farms could also be affected.” (Non sequitur)
You should read the whole article from MyWay news to fully appreciate the epidemiological work of the “experts”.
Also bear in mind that the organisms associated with food poisoning are transmitted among people by poor hygiene, personal contact, (the fecal oral route), and improper food handling.