A patient infected with the virulent E. coli bacteria is undergoing dialysis treatment at an intensive care unit of Hamburg's UKE university clinic on June 1, 2011. The number of people sickened by a mysterious killer bacteria grew, two weeks after the outbreak in Germany, while fears over tainted vegetables hit European farmers hard. Scientists and health officials say they have identified the E. coli bacteria (EHEC) responsible for the outbreak, which has mainly affected northern Germany, but are unable to say what caused it or who was responsible. AFP PHOTO ANGELIKA WARMUTH GERMANY OUT