BERLIN – The number of people hit by a massive European outbreak of foodborne bacterial infections is a third bigger than previously known and a stunningly high number of patients suffer from a potentially deadly complication than can shut down their kidneys, officials said Wednesday.

The death toll rose to 17, with German authorities reporting that an 84-year-old woman with the complication had died on Sunday.

Medical authorities appeared no closer to discovering either the source of the infection or the mystery at the heart of the outbreak: why the unusual strain of the E. coli bacteria appears to be causing so many cases of hemolytic uremic syndrome, which attacks the kidneys and can cause seizures, strokes and comas.

Germany’s national health agency said 1534 people in the country had been infected by enterohaemorrhagic E.coli, or EHEC, a particularly deadly strain of the common bacteria found in the digestive systems of cows, humans and other mammals. The Robert Koch Institute had reported 1169 a day earlier.

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