Reinhard Burger, head of the Robert Koch Institute (RKI), addresses the media in Berlin, June 10, 2011. New data shows that bean sprouts are the most likely source of the outbreak of E.coli which has killed 30 people so far, all but one of them in Germany, the country's health authorities said on Friday. REUTERS/Tobias Schwarz (GERMANY - Tags: POLITICS HEALTH SOCIETY SCI TECH)