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To avoid illness, the World Health Organization recommends that people wash their hands, keep raw meat separate from other food, thoroughly cook any food, and wash fruits and vegetables. Experts also recommend peeling raw fruits and vegetables if possible.

In the meantime, some experts started criticizing the slow pace of the investigations.

The medical director of Berlin’s Charite Hospitals said Saturday it made him “anxious” that a month after the outbreak there was still no clue as to what causes the epidemic.

Ulrich Frei told daily paper Tagesspiegel that only last week his hospital received questionnaires from the national disease control center for E.coli patients in order to track down the source of the infection.

“That’s not enough,” Frei said. “One should have interviewed the patients right away.”