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Antibiotic resistance profiling and phylotyping of human-diarrheagenic Escherichia coli pathotypes detected from diarrheic and non-diarrheic calves in Iran

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Abstract

Background

Escherichia coli (E. coli) serves as a common indicator of gut microbiota and is utilized for monitoring antimicrobial resistance determinants in food-producing animals. This study aimed to investigate antimicrobial resistance patterns in virulence gene-positive E. coli isolates obtained from 340 healthy and diarrheic calves.

Methods and results

A total of 340 fecal swab samples were obtained from diarrheic (n = 170) and healthy (n = 170) calves for 12 months from different farms in Kerman, Iran. The samples were phenotypically analyzed to detect E. coli isolates and antibiotic resistance. Also, antimicrobial resistance genes, diarrheagenic E. coli pathotypes, and phylogenetic background were screened by PCR. Fifteen percent (51/340) of E. coli isolates were positive for at least one of the examined virulence genes (VGs); the prevalence of VGs in E. coli isolates from healthy calves (36/170; 21.17%) was higher than that in diarrheic cases (15/170; 8.82%). Out of the 51 VG-positive isolates, six pathotypes including Shiga toxin-producing E. coli (STEC; 27.45%), enterotoxigenic E. coli (ETEC; 23.52%), enterohemorrhagic E. coli (EHEC; 19.6%), necrotoxigenic E. coli (NTEC; 19.6%), enteropathogenic E. coli (EPEC; 15.68%), enteroinvasive E. coli (EIEC; 1.96%) and three hybrid pathotypes including ETEC/STEC, ETEC/EHEC, and STEC/EIEC were detected among the strains. Antimicrobial resistance (AR) was observed in 98.03% of the VG-positive isolates, which was the same for both healthy and diarrheic calves. The maximum prevalence rate of AR was found against trimethoprim/sulfamethoxazole (49.01%; 3/51), while the minimum prevalence rate was against gentamycin (5.88%; 25/51). Among the VG-positives, phylotype A was found to be the most prevalent followed by B1 and D phylotypes.

Conclusions

The prevalence of VG-positive E. coli isolates was higher in healthy calves compared to diarrheic cases. AR was widespread among VG-positive isolates. These findings suggest that calves may serve as potential reservoirs of antimicrobial-resistant hybrid pathotypes of E. coli.

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Data availability

All data supporting the findings of this study are available within the paper. This study lacks data related to DNA/RNA sequences/sequencing data, genetic polymorphisms, linked genotype/phenotype data, macromolecular structure, microarray data and crystallographic data for small molecules. As such, we have not data for deposition into a database or uploaded into a repository.

Abbreviations

AR:

Antimicrobial resistance

CTX:

Cefotaxime

CTC:

Cefotaxime/clavulanic acid

CAZ:

Ceftazidime

CZA:

Ceftazidime-clavulanic acid

NFX:

Enrofloxacin

EHEC:

Enterohemorrhagic E. coli

EIEC:

Enteroinvasive E. coli

EPEC:

Enteropathogenic E. coli

ETEC:

Enterotoxigenic E. coli

E. coli :

Escherichia coli

FF:

Florfenicol

GM:

Gentamycin

K:

Kanamycin

NTEC:

Necrotoxigenic E. coli

WHO:

World Health Organization

OIE:

Organization for animal health

STEC:

Shiga toxin-producing E. coli

SPT:

Spectinomycin

S:

Streptomycin

SMZ:

Sulfamethoxazole

TE:

Tetracycline

SXT:

Trimethoprim/sulfamethoxazole

VG:

Virulence gene

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Acknowledgements

The authors would like to express their gratitude to the employees of microbiology laboratory, faculty of veterinary medicine, Shahid Bahonar university of Kerman for their kind participation in this research.

Funding

The authors did not receive support from any organization for the submitted work.

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Authors and Affiliations

Authors

Contributions

All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by Zahede Naderi, Maziar Jajarmi, Sanaz Dehdashti, Mahboube Bagheri, Neda Eskandarzade, Parvin Mohseni and Hesam Alizade. The first draft of the manuscript was written by Reza Ghanbarpour and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Reza Ghanbarpour.

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Competing interests

The authors have no relevant financial or non-financial interests to disclose.

Ethical approval

This work presents research on animals that do not require ethical approval for their study; no human studies are presented in the work, no potentially identifiable images or data are presented in this study, and laboratory animals and human samples were not used in this study. All fecal samples were obtained from the calves with the consent of farm managers. All methods were carried out in accordance with relevant guidelines and regulations presented by Iran National Committee for Ethics in Biomedical Research.

Consent to participate

Informed consent was obtained from all individual participants (farm managers) included in the study.

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No human studies are presented in the work. No potentially identifiable images or data are presented in this study. All fecal samples were obtained from the calves with the consent of farm managers.

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Naderi, Z., Ghanbarpour, R., Jajarmi, M. et al. Antibiotic resistance profiling and phylotyping of human-diarrheagenic Escherichia coli pathotypes detected from diarrheic and non-diarrheic calves in Iran. Mol Biol Rep 51, 494 (2024). https://doi.org/10.1007/s11033-024-09494-6

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