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Four hundred fifty Escherichia coli strains of 45 O serogroups and subgroups and 112 serotypes were studied to determine their patterns of adherence to HeLa cells. Adherence was exhibited by strains of 17 O serogroups and subgroups, but within these groups more than one adherence pattern was frequently observed. However, within each serotype, the adherence pattern was highly consistent. Localized adherence (LA) was observed much more frequently in serotypes that we considered to be enteropathogenic E. coli serotypes (93%) than in other serotypes (14%), whereas diffuse adherence (DA) occurred predominantly among nonenteropathogenic E. coli strains. Determination of biochemical characteristics showed that within O serogroups, nonmotile strains tended to have the same behavior as motile strains with the LA adherence pattern, suggesting that they were derived from these motile strains. LA and non-LA strains of the same serotype differed biochemically. LA appears to be a property of most E. coli commonly considered to be enteropathogenic and should assist attempts to determine which E. coli are enteropathogenic and to elucidate their pathogenic mechanisms.

Correlation between adherence to HeLa cells and serogroups, serotypes, and bioserotypes of Escherichia coli