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A total of 16 strains of Enterohemorrhagic Escherichia coli (EHEC) isolated from diarrea patients in Saitama from 1990 to 1992 were tested for their serotype, verotoxin production, biochemical characteristics, antibiotics sensitivity and plasmid profiles. By serotype analysis, 14 strains from two outbreaks and 12 sporadic cases were classified as type O157:H7, one as O111:H-(not motility) and one as O128:H2. Typing of verotoxin by gene analysis using Polymerase Chain Reaction (PCR) showed that 9 of O157:H7 strains including two cases from outbreaks and O128:H2 have VT1 and VT2 genes, other O157:H7 have the VT2 gene and O111:H-has only the VT1 gene. Biochemical characteristic analysis indicated two strains of O157:H7 type from outbreaks were biotype II and the rest of O157:H7 were biotype I. One of the O157:H7 strain from a sporadic case showed positive for urease production. According to sensitivity tests against antibiotics, out of the O157:H7 group, one strain was resistant against ABPC, one against SM and two strains resistant to SM-TC. For plasmid profiles, all strains had 94 Kb plasmids and several smaller sizes of plasmids. But 5 strains of O157:H7 had 94 Kb plasmid only.

Biological Characters of Enterohemorrhagic Escherichia coli Isolates from Diarrhea Patients in Saitama (1990-1992)