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98 Escherichia coli strains of serotype O148:H28 isolated from diarrheal patients from 10 Asian countries and Mexico at Osaka Airport Quarantine were analyzed for enterotoxigenicity and plasmid profile. They were classified into three groups. The first group contained 44 strains that were non-enterotoxigenic and carried 3.9 kb and 50 kb non-enterotoxin plasmids. The second group contained 9 strains that produced LT and ST. They carried a 45 kb enterotoxin plasmid, and 4.6 kb and 9.2 kb non-enterotoxin plasmids. The third group contained 45 strains that produced ST. They carried a 40 kb enterotoxin plasmid, and non-enterotoxin plasmids other than 3.9 kb, 4.6 kb, 9.2 kb and 50 kb. Southern blot hybridization demonstrated that all the non-enterotoxin or enterotoxin plasmids carried by the strains of the same group were identical or similar. These results suggested that the 98 E. coli strains with O148:H28 serotype were derived from three clones, and that the individual strains among each group were derived from a single clonal strain.
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