Germany redoubled efforts Tuesday to trace the source of a bacteria outbreak that has killed 23 amid warnings it might never be found, while the EU met to discuss aid for farmers hit hard by the crisis.

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Hopes that the source of contamination had finally been located suffered a setback on Monday when initial probes carried out on a farm growing a variety of sprouts in the northern state of Lower Saxony proved negative.
Authorities were expected to release the results from 17 more samples of seeds, water, and work surfaces taken from the farm.
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