Dataset Information

Genomic Characterization of ?-Glucuronidase-Positive Escherichia coli O157:H7 Producing Stx2a.

ABSTRACT: Among Shiga toxin (Stx)-producing Escherichia coli (STEC) O157:H7 strains, those producing Stx2a cause more severe diseases. Atypical STEC O157:H7 strains showing a ?-glucuronidase-positive phenotype (GP STEC O157:H7) have rarely been isolated from humans, mostly from persons with asymptomatic or mild infections; Stx2a-producing strains have not been reported. We isolated, from a patient with bloody diarrhea, a GP STEC O157:H7 strain (PV15-279) that produces Stx2a in addition to Stx1a and Stx2c. Genomic comparison with other STEC O157 strains revealed that PV15-279 recently emerged from the stx1a/stx2c-positive GP STEC O157:H7 clone circulating in Japan. Major virulence genes are shared between typical (?-glucuronidase-negative) and GP STEC O157:H7 strains, and the Stx2-producing ability of PV15-279 is comparable to that of typical STEC O157:H7 strains; therefore, PV15-279 presents a virulence potential similar to that of typical STEC O157:H7. This study reveals the importance of GP O157:H7 as a source of highly pathogenic STEC clones.

SUBMITTER: Ogura Y

PROVIDER: S-EPMC6256406 | biostudies-literature | 2018 Dec

REPOSITORIES: biostudies-literature

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Genomic Characterization of β-Glucuronidase-Positive Escherichia coli O157:H7 Producing Stx2a.

Ogura Yoshitoshi Y Seto Kazuko K Morimoto Yo Y Nakamura Keiji K Sato Mitsuhiko P MP Gotoh Yasuhiro Y Itoh Takehiko T Toyoda Atsushi A Ohnishi Makoto M Hayashi Tetsuya T

Emerging infectious diseases 20181201 12

Among Shiga toxin (Stx)-producing Escherichia coli (STEC) O157:H7 strains, those producing Stx2a cause more severe diseases. Atypical STEC O157:H7 strains showing a β-glucuronidase-positive phenotype (GP STEC O157:H7) have rarely been isolated from humans, mostly from persons with asymptomatic or mild infections; Stx2a-producing strains have not been reported. We isolated, from a patient with bloody diarrhea, a GP STEC O157:H7 strain (PV15-279) that produces Stx2a in addition to Stx1a and Stx2c. ...[more]

PMID: 30457544

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Project description:BackgroundThe worldwide increase in multidrug resistance is a major threat to public health. One particular concern is the presence of Escherichia coli strains that carry Extended-Spectrum β-Lactamase (ESBL) and Carbapenemase enzymes, which can make multiple antibiotics ineffective. This complicates treatment strategies and raises the risk of illness and death. The aim of this study was to isolate E. coli O157:H7, assess its susceptibility against antimicrobial agents, and determine the presence of ESBL and Carbapenemase production in stool samples collected from diarrheic patients in Shashemene, west Arsi, Ethiopia from July to November 2022.MethodsThe samples were cultured McConkey Agar and E. coli were isolated and identified by standard biochemical tests using API 20E. E. coli O157:H7 was further identified using sorbitol McConkey Agar and antisera for O157 antigen test. The antimicrobial susceptibility test was performed using the Kirby-Bauer disc diffusion method using different antibiotics. Each identified isolate was screened and tested for phenotypical ESBL and Carbapenemase production using combined disc method and modified carbapenem inactivation method, respectively. Bivariant and multivariant analyses were employed using a logistic regression model for further analysis and were interpreted based on the odds ratio and level of statistical significance at a p-value <0.05 with 95% confidence interval.ResultsE. coli O157:H7 strain was found from 9% (38/423) study participants. The majority of the participants [61.9% (262/423)] were males; and 19.1% (81/ 423) of the participants were under five children. Living in urban areas, having domestic animals, and ≥5 family size in the household were identified as statistically significant factors associated with E. coli O157:H7. Twenty-seven (71.1%) and 12 (31.6%) of the 38 E. coli O157:H7 isolates were phenotypically confirmed to be ESBL and carbapenemase producers, respectively. All isolates were resistant against Ampicillin, but sensitive to ciprofloxacin. High resistance to Ampicillin and Amoxicillin/Clavulanic acid was observed among the ESBL and carbapenemase producing isolates also. The extent of detection of multidrug resistant E. coli O157:H7 isolates against three or more classes of antimicrobial agents tested was alarmingly very high (84%).ConclusionThe E. coli O157:H7 isolates in this study showed a significant resistance to certain antimicrobials that were tested. The level of ESBL and Carbapenemase production among these isolates was found to be quite high. We observed a high resistance to Ampicillin and Amoxicillin/Clavulanic acid among the ESBL and carbapenemase producing isolates. Ciprofloxacin was found to be the most effective drug against both the ESBL producers and nonproducers.

Dataset Information

Genomic Characterization of ?-Glucuronidase-Positive Escherichia coli O157:H7 Producing Stx2a.

Publications

Genomic Characterization of β-Glucuronidase-Positive Escherichia coli O157:H7 Producing Stx2a.

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