Abstract
Objective: Escherichia coli is commensal bacterium of human intestine. The gut is a common pool of E. coli isolates causing urinary tract infections (UTIs). Some of fecal E. coli (FeEC) by the possession of certain virulence factors is able to cause diseases in human and other mammalian models. To evaluate the health threats coordinated with a given fecal source of E. coli strains, we determined the frequency of genes expressing virulence determinants in fecal E. coli isolates collected from human feces in Zabol, southeast of Iran. Methods: Escherichia coli isolates (n = 94) were separated from the feces of patients attending teaching hospitals, and screened for various virulence genes: fimH, his, hlyA, ompT, irp2, iucD, iroN, and cnf1 by using the multiplex polymerase chain reaction (PCR) method. Results: The prevalence of virulence genes was as follows: adhesins (fimH, 98% and iha, 26%), alpha-hemolysins (hlyA, 10%), outer membrane protease (ompT, 67%), aerobactin (iucD, 67%), iron-repressible protein (irp2, 91%) and salmochelin (iroN, 33%) and cytotoxic necrotizing factor 1 (cnf1). According to the diversity of different virulence genes, the examined isolates exhibited 29 different patterns. Conclusion: Our results demonstrated that most of the assessed isolates harbored several virulence factors. Our findings propose possibility of human feces serving as a source for pathogenic organisms, supporting the notion that fecal materials of humans play a role in the epidemiological chain of extra-intestinal pathogenic E. coli. This is the first report of the frequency of virulence factors among E. coli isolates collected from human feces in Iran.
Highlights
Escherichia coli represents as the most encountered etiology for urinary tract infections (UTIs) identified in the gastrointestinal tract of mammals
To evaluate the health threats coordinated with a given fecal source of E. coli strains, we determined the frequency of genes expressing virulence determinants in fecal E. coli isolates collected from human feces in Zabol, southeast of Iran
Our findings propose possibility of human feces serving as a source for pathogenic organisms, supporting the notion that fecal materials of humans play a role in the epidemiological chain of extra-intestinal pathogenic E. coli
Summary
Escherichia coli represents as the most encountered etiology for urinary tract infections (UTIs) identified in the gastrointestinal tract of mammals. Commensal strains can lead to a disease in host with compromised immune system.[5] Some pathogenic strain of E. coli persist in gastrointestinal tract of human and are frequently associated with human diseases. According to multiple virulence determinants, E. coli bacteria can be categorized into 3 major subclasses: commensal, intestinal pathogenic and extra intestinal pathogenic E. coli (ExPEC).[6] It has been shown that intestinal and ExPEC strains may be extended from commensal types through obtaining of virulence mediators.[7] ExPEC exhibit significant genetic heterogenicity and represents a wide spectrum of virulence-related factors such as adhesins, toxins, and iron up taking molecules, lipopolysaccharides, polysaccharide capsules, and invasions, which can be expressed on mobile genetic segments including plasmids, bacteriophages, and pathogenici-
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