Rolf Stahl, Director Nephrology of the 'Universitaetsklinikum Hamburg-Eppendorf ' (University Clinic Eppendorf- UKE) (L), and Reinhard Brunkhorst, President of German Organisation for Nephrology, are pictured during a news conference in Hamburg, June 3, 2011. More than 1,600 people have been infected by a toxic strain of E.coli bacteria that has killed at least 17 and may be the deadliest yet in human history, health officials said on Friday. REUTERS/Fabian Bimmer (GERMANY - Tags: HEALTH POLITICS)