The dangerous strain of the bacteria E.coli initially linked to bean-sprouts in northern Germany has been found in a stream in the Frankfurt region.
But the authorities say there is no risk to the region’s drinking water.
So far there is no explanation as to how the bacteria got into the stream.
Tests did find a more harmless strain on lettuce at a nearby farm. The government says produce from that farm has been removed from shops and there is no health risk at present.
In neighbouring France an eighth child has been admitted to hospital in Lille suffering severe food poisoning. The other seven had all been taken ill with E.coli infection after eating frozen burgers. One child is now in a coma. It is a different strain from the deadly one found in Germany.
In Germany the new strain of E.coli has now killed 38 people but is on the wane, according to the Robert Koch Institute for Infectious Diseases.