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Urinary tract infections (UTI) are one of the most frequent infectious diseases. Uropathogenic Escherichia coli (UPEC) are among major pathogens causing UTI. A variety of virulence genes are mainly responsible for the severity of these emerging infection. This study investigate the influences of virulence properties of UPEC isolates with reference to multi-locus sequence typing (MLST). The aim of this study was targeted that investigation of the bacterial pathogenicity associated with UTI in children. A total of 58 UPEC isolates were collected from urine samples from patients with clinical diagnosis of uncomplicated UTI. The MLST of UPEC strains were assessed by methods based on polymerase chain reaction. Motility was evaluated using soft-agar plates. Biofilm formation was analyzed in microtiter dish biofilm formation assay. Cell death assay was analyzed by Annexin V/Phosphatidylserine staining and DNA fragmentation assay. According the result, the predominant sequence type (ST) was ST95 (24.1%) and ST73 (17.2%). There were some difference in virulence gene and antibiotics resistance between ST95 and ST73. The number of 11 (18.9%) isolates were strongly adherent. Based on the detected biofilm formation, these strongly adherent are almost ST73. The ST95 was higher than ST73 in population, but ST95 was lower than ST73 in motility and cell death induction. This study indicated that the UPEC molecular strains are related to some virulence traits. Furthermore, the virulence factors carried by ST73 strains contribute to their abilities to colonize the host and cause disease.

Clonal and Virulence Distribution of UropathogenicEscherichia coliIsolated from Children in Korea