Antimicrobial resistance and mcr-1 gene in Escherichia coli isolated from poultry samples submitted to a bacteriology laboratory in South Africa
Background and Aim: Antimicrobial resistance (AMR) and recently mobilized colistin resistance (mcr-1) associated colistin resistance among Escherichia coli isolates have been attributed to the overuse of antimicrobials in livestock production. E. coli remains an important pathogen, often associated...
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| Format: | Article |
| Language: | English |
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Veterinary World
2021-10-01
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| Series: | Veterinary World |
| Subjects: | |
| Online Access: | http://www.veterinaryworld.org/Vol.14/October-2021/12.pdf |
| _version_ | 1818838009531858944 |
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| author | Ibrahim Z. Hassan Buks Wandrag Johan J. Gouws Daniel N. Qekwana Vinny Naidoo |
| author_facet | Ibrahim Z. Hassan Buks Wandrag Johan J. Gouws Daniel N. Qekwana Vinny Naidoo |
| author_sort | Ibrahim Z. Hassan |
| collection | DOAJ |
| description | Background and Aim: Antimicrobial resistance (AMR) and recently mobilized colistin resistance (mcr-1) associated colistin resistance among Escherichia coli isolates have been attributed to the overuse of antimicrobials in livestock production. E. coli remains an important pathogen, often associated with mortality and low carcass weight in poultry medicine; therefore, the need to use antimicrobials is common. The study aimed to determine the AMR profile and presence of mcr-1 and mcr-2 genes in avian pathogenic E. coli from poultry samples tested at a bacteriology laboratory for routine diagnosis. This is a first step in understanding the effectiveness of mitigation strategies.
Materials and Methods: Fifty E. coli strains were assessed for resistance against ten antimicrobial drugs using broth microdilution. All isolates with a colistin minimum inhibitory concentration (MIC) of 2 μg/mL were analyzed for the presence of mcr-1 and mcr-2 genes by employing the polymerase chain reaction. For each isolate, the following farm information was obtained: farm location, type of farm, and on-farm use of colistin.
Results: Sixty-eight percent of the strains were resistant to at least one antimicrobial; 44% were multiple drug-resistant (MDR). Most E. coli isolates were resistant to doxycycline (44%), trimethoprim-sulfamethoxazole (38%), ampicillin (32%), and enrofloxacin (32%). None of the E. coli strains was resistant to colistin sulfate (MIC90 of 2 μg/mL). Only one E. coli isolate held the mcr-1 gene; none carried the mcr-2 gene.
Conclusion: Resistance among E. coli isolates in this study was fairly high. Resistance to commonly used antimicrobials was observed, such as doxycycline, trimethoprim-sulfamethoxazole, and enrofloxacin. Only a single E. coli strain carried the mcr-1 gene, suggesting that mcr-1 and mcr-2 genes are common among isolates in this study. The prevalence of AMR, however, suggests that farmers must implement standard biosecurity measures to reduce E. coli burden, and antimicrobial use to prolong the efficacy life span of some of these drugs. |
| first_indexed | 2024-12-19T03:31:35Z |
| format | Article |
| id | doaj.art-535c51f7cffa4945b47082fd4d000045 |
| institution | Directory Open Access Journal |
| issn | 0972-8988 2231-0916 |
| language | English |
| last_indexed | 2024-12-19T03:31:35Z |
| publishDate | 2021-10-01 |
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| spelling | doaj.art-535c51f7cffa4945b47082fd4d0000452022-12-21T20:37:29ZengVeterinary WorldVeterinary World0972-89882231-09162021-10-0114102662266910.14202/vetworld.2021.2662-2669Antimicrobial resistance and mcr-1 gene in Escherichia coli isolated from poultry samples submitted to a bacteriology laboratory in South AfricaIbrahim Z. Hassan0https://orcid.org/0000-0003-4441-833XBuks Wandrag1https://orcid.org/0000-0001-6657-7791Johan J. Gouws2https://orcid.org/0000-0001-5002-8093Daniel N. Qekwana3https://orcid.org/0000-0002-4609-5151Vinny Naidoo4https://orcid.org/0000-0003-2740-5983Department of Paraclinical Sciences, Veterinary Pharmacology/Toxicology Section, Faculty of Veterinary Science, University of Pretoria, Pretoria, South Africa.Department of Production Animal Studies, Faculty of Veterinary Science, University of Pretoria, Pretoria, South Africa.Department of Veterinary Tropical Diseases, Faculty of Veterinary Science, University of Pretoria, Pretoria, South Africa.Department of Paraclinical Sciences, Veterinary Public Health Section, Faculty of Veterinary Science, University of Pretoria, Pretoria, South Africa.Department of Paraclinical Sciences, Veterinary Pharmacology/Toxicology Section, Faculty of Veterinary Science, University of Pretoria, Pretoria, South Africa.Background and Aim: Antimicrobial resistance (AMR) and recently mobilized colistin resistance (mcr-1) associated colistin resistance among Escherichia coli isolates have been attributed to the overuse of antimicrobials in livestock production. E. coli remains an important pathogen, often associated with mortality and low carcass weight in poultry medicine; therefore, the need to use antimicrobials is common. The study aimed to determine the AMR profile and presence of mcr-1 and mcr-2 genes in avian pathogenic E. coli from poultry samples tested at a bacteriology laboratory for routine diagnosis. This is a first step in understanding the effectiveness of mitigation strategies. Materials and Methods: Fifty E. coli strains were assessed for resistance against ten antimicrobial drugs using broth microdilution. All isolates with a colistin minimum inhibitory concentration (MIC) of 2 μg/mL were analyzed for the presence of mcr-1 and mcr-2 genes by employing the polymerase chain reaction. For each isolate, the following farm information was obtained: farm location, type of farm, and on-farm use of colistin. Results: Sixty-eight percent of the strains were resistant to at least one antimicrobial; 44% were multiple drug-resistant (MDR). Most E. coli isolates were resistant to doxycycline (44%), trimethoprim-sulfamethoxazole (38%), ampicillin (32%), and enrofloxacin (32%). None of the E. coli strains was resistant to colistin sulfate (MIC90 of 2 μg/mL). Only one E. coli isolate held the mcr-1 gene; none carried the mcr-2 gene. Conclusion: Resistance among E. coli isolates in this study was fairly high. Resistance to commonly used antimicrobials was observed, such as doxycycline, trimethoprim-sulfamethoxazole, and enrofloxacin. Only a single E. coli strain carried the mcr-1 gene, suggesting that mcr-1 and mcr-2 genes are common among isolates in this study. The prevalence of AMR, however, suggests that farmers must implement standard biosecurity measures to reduce E. coli burden, and antimicrobial use to prolong the efficacy life span of some of these drugs.http://www.veterinaryworld.org/Vol.14/October-2021/12.pdfantimicrobial resistancecolistinescherichia colimobilized colistin resistance-1poultry |
| spellingShingle | Ibrahim Z. Hassan Buks Wandrag Johan J. Gouws Daniel N. Qekwana Vinny Naidoo Antimicrobial resistance and mcr-1 gene in Escherichia coli isolated from poultry samples submitted to a bacteriology laboratory in South Africa Veterinary World antimicrobial resistance colistin escherichia coli mobilized colistin resistance-1 poultry |
| title | Antimicrobial resistance and mcr-1 gene in Escherichia coli isolated from poultry samples submitted to a bacteriology laboratory in South Africa |
| title_full | Antimicrobial resistance and mcr-1 gene in Escherichia coli isolated from poultry samples submitted to a bacteriology laboratory in South Africa |
| title_fullStr | Antimicrobial resistance and mcr-1 gene in Escherichia coli isolated from poultry samples submitted to a bacteriology laboratory in South Africa |
| title_full_unstemmed | Antimicrobial resistance and mcr-1 gene in Escherichia coli isolated from poultry samples submitted to a bacteriology laboratory in South Africa |
| title_short | Antimicrobial resistance and mcr-1 gene in Escherichia coli isolated from poultry samples submitted to a bacteriology laboratory in South Africa |
| title_sort | antimicrobial resistance and mcr 1 gene in escherichia coli isolated from poultry samples submitted to a bacteriology laboratory in south africa |
| topic | antimicrobial resistance colistin escherichia coli mobilized colistin resistance-1 poultry |
| url | http://www.veterinaryworld.org/Vol.14/October-2021/12.pdf |
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