Abstract
Enteroaggregative Escherichia coli (EAEC) is an emerging enteropathogen mainly in developing countries. The virulence mechanisms of EAEC are not completely understood and the role of various factors described still requires further investigation. Enteropathogenicity appears to be an attribute of certain subgroups within the category and resistance to antibiotics has been identified as a relevant characteristic among EAEC strains. Phylogenetic studies have shown that E. coli can be divided into four main groups designated A, B1, B2 and D. The purpose of this study was to determine the phylogenetic group and resistance to antibiotics in EAEC isolates obtained from children with diarrheal disease and control subjects by polymerase chain reaction and standard disk diffusion method. Phylotyping revealed a bacterial population distributed in phylogenetic groups A (65.8%), D (20.7%), B1 (9.7%) and B2 (3.6%). Antimicrobial resistance was observed in 65.9% of the bacterial population. Multidrug resistance phenotype was detected mainly among EAEC isolated from diarrheal children and belonging to phylogenetic groups A and D. The data contribute to the knowledge of genetic epidemiological aspects of these enteropathogens circulating in our community.
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