Abstract
The outbreak of enterohaemorrhagic Escherichia coli (EHEC) O157:H7 infection in Obihiro City, Japan, occurred in late October 1996. The infection affected a total of 169 kindergarten pupils and school staff members in a private kindergarten. Twenty-one children (12.4%) progressed into hemolytic uremic syndrome (HUS). Moreover, the person-to-person infections in 9 families and the duration of excretion of EHEC in 13 patients were observed. The contaminated food was identified as the potato-salad served at lunch. Analysis of biological characteristics, the ability of toxin production, and the DNA analysis by PCR-based fingerprinting, the RAPD tests, among all clinical isolates, clarified a homologous origin of contamination.
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