Deaths from E coli outbreak unprecedented, experts say
The death toll rose to 17, with German authorities reporting that an 84-year-old woman with the complication 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.