Escherichia coli O serotyping in different patient groups with urinary tract infections

Abstract

Using 44 anti-O sera 789 Escherichia coli strains isolated from the urine of patients with urinary tract infections were typed. Of the 119 E. coli strains from the urine of children, 49.6% were O-typable; only 3.4% were rough strains. Of 357 strains from pregnant women, 47% were O-typable; 12.1% were rough strains. The largest proportion of O-typable E. coli strains was found among 314 strains isolated from adults with recurrent urinary tract infections (55.4% of the 314 strains); 8% were rough strains. The higher proportion of E. coli rough strains in adults, including pregnant women, indicate that once a pyelonephritis process has been established by virulent smooth strains in childhood, it can be sustained by rough strains at a later stage. Certain O serotypes were found to occur with a variable frequency in the individual patient groups. Enteropathogenic E. coli strains were seldom found in any of the three groups.

Phylogenetic characterization of UPEC and its relation with serotyping, distribution of virulence factors, antimicrobial resistance pattern and biofilm formation ability: An apparent elucidation of the bacterial nature

“…25 , O 75 , and O 15 to be predominantly prevalent while, serotypes O 83 and O 22 had the lowest prevalence which is similar to the studies conducted earlier in Iran and Mexico city[4,[24][25][26]. Various O-serogroups are found with variable frequencies in UTIs patients[27][28][29][30]. The present investigation also observed signi cant (p < 0.05) relation between the O 8…”

Uropathogenic Escherichia coli in Iran: Serogroup distributions, virulence factors and antimicrobial resistance properties

“…Totally, O25 and O15 were the most prevalent serogroups. Since 1980 [52], many investigators reported that several O-serogroups were found with variable frequencies in UTIs patients. Similar results have been reported recently too [12,53].…”