Genotypic characterization of mecA gene and antibiogram profile of coagulase-negative staphylococci in subclinical mastitic cows
Background and Aim: Coagulase-negative staphylococci (CNS) are becoming the major cause of clinical and subclinical bovine mastitis around the world. This study aims to estimate the prevalence, antibiogram, and frequency of the methicillin-resistant (MR) (mecA) gene in CNS collected from cows with s...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Veterinary World
2022-09-01
|
| Series: | Veterinary World |
| Subjects: | |
| Online Access: | http://www.veterinaryworld.org/Vol.15/September-2022/9.pdf |
| _version_ | 1798033928766881792 |
|---|---|
| author | Eman S. Ibrahim Sohad M. Dorgham Asmaa S. Mansour Abeer M. Abdalhamed Doaa D. Khalaf |
| author_facet | Eman S. Ibrahim Sohad M. Dorgham Asmaa S. Mansour Abeer M. Abdalhamed Doaa D. Khalaf |
| author_sort | Eman S. Ibrahim |
| collection | DOAJ |
| description | Background and Aim: Coagulase-negative staphylococci (CNS) are becoming the major cause of clinical and subclinical bovine mastitis around the world. This study aims to estimate the prevalence, antibiogram, and frequency of the methicillin-resistant (MR) (mecA) gene in CNS collected from cows with subclinical mastitis.
Materials and Methods: Thirty-four milk samples were collected from 20 cows. Fifteen subclinical mastitis samples (∼44.12%) were identified as CNS isolates. The Vitek2 compact system method was employed for the identification of the species. Furthermore, antibiotic sensitivity tests were performed against 10 different antibiotics for CNS strains. The mecA gene from isolated CNS was detected by conventional polymerase chain reaction (PCR).
Results: Staphylococcus haemolyticus was the most predominant isolated species with an incidence of 33.3% (5/15 isolates), followed by 26.7% for Staphylococcus sciuri and Staphylococcus vitamins (4/15 isolates), and 13.3% for Staphylococcus vitulinus (2/15 isolates), respectively. The highest resistance rates were determined to be 40% (6/15 isolates) against penicillin and oxacillin (OX), 33.3% (5/15 isolates) against clindamycin, 13% (2/15 isolates) against chloramphenicol, amoxicillin, and erythromycin, and 5% (1/15 isolates) against ciprofloxacin, respectively. The results revealed that the isolates were resistant to one or more antimicrobial agents, with five isolates displaying multiple antimicrobial resistance. Furthermore, the results exhibit that all CNS isolates had the mecA gene at 310 bp with a 100% frequency. Moreover, for detecting MR isolates, there are significant discrepancies between phenotypic and genotypic approaches, and only 6/15 CNS isolates phenotypically demonstrated OX resistance.
Conclusion: The results emphasize the necessity of frequent monitoring of phenotypic and genotypic profiles of CNS isolates to ensure effective control measures and the prevention of multidrug resistance strain evolution. |
| first_indexed | 2024-04-11T20:37:12Z |
| format | Article |
| id | doaj.art-a3e02f1cc8aa49208ad67de7ff1aa1ca |
| institution | Directory Open Access Journal |
| issn | 0972-8988 2231-0916 |
| language | English |
| last_indexed | 2024-04-11T20:37:12Z |
| publishDate | 2022-09-01 |
| publisher | Veterinary World |
| record_format | Article |
| series | Veterinary World |
| spelling | doaj.art-a3e02f1cc8aa49208ad67de7ff1aa1ca2022-12-22T04:04:20ZengVeterinary WorldVeterinary World0972-89882231-09162022-09-011592186219110.14202/vetworld.2022.2186-2191Genotypic characterization of mecA gene and antibiogram profile of coagulase-negative staphylococci in subclinical mastitic cowsEman S. Ibrahim0https://orcid.org/0000-0002-6315-4512Sohad M. Dorgham1https://orcid.org/0000-0002-9533-3048Asmaa S. Mansour2https://orcid.org/0000-0002-2307-0760Abeer M. Abdalhamed3https://orcid.org/0000-0001-6834-721XDoaa D. Khalaf4https://orcid.org/0000-0003-3436-9431Department of Microbiology and Immunology, National Research Centre, Giza, Egypt.Department of Microbiology and Immunology, National Research Centre, Giza, Egypt.Department of Microbiology and Immunology, National Research Centre, Giza, Egypt.Department of Parasitology and Animals Diseases, National Research Centre, Giza, Egypt.Department of Microbiology and Immunology, National Research Centre, Giza, Egypt.Background and Aim: Coagulase-negative staphylococci (CNS) are becoming the major cause of clinical and subclinical bovine mastitis around the world. This study aims to estimate the prevalence, antibiogram, and frequency of the methicillin-resistant (MR) (mecA) gene in CNS collected from cows with subclinical mastitis. Materials and Methods: Thirty-four milk samples were collected from 20 cows. Fifteen subclinical mastitis samples (∼44.12%) were identified as CNS isolates. The Vitek2 compact system method was employed for the identification of the species. Furthermore, antibiotic sensitivity tests were performed against 10 different antibiotics for CNS strains. The mecA gene from isolated CNS was detected by conventional polymerase chain reaction (PCR). Results: Staphylococcus haemolyticus was the most predominant isolated species with an incidence of 33.3% (5/15 isolates), followed by 26.7% for Staphylococcus sciuri and Staphylococcus vitamins (4/15 isolates), and 13.3% for Staphylococcus vitulinus (2/15 isolates), respectively. The highest resistance rates were determined to be 40% (6/15 isolates) against penicillin and oxacillin (OX), 33.3% (5/15 isolates) against clindamycin, 13% (2/15 isolates) against chloramphenicol, amoxicillin, and erythromycin, and 5% (1/15 isolates) against ciprofloxacin, respectively. The results revealed that the isolates were resistant to one or more antimicrobial agents, with five isolates displaying multiple antimicrobial resistance. Furthermore, the results exhibit that all CNS isolates had the mecA gene at 310 bp with a 100% frequency. Moreover, for detecting MR isolates, there are significant discrepancies between phenotypic and genotypic approaches, and only 6/15 CNS isolates phenotypically demonstrated OX resistance. Conclusion: The results emphasize the necessity of frequent monitoring of phenotypic and genotypic profiles of CNS isolates to ensure effective control measures and the prevention of multidrug resistance strain evolution.http://www.veterinaryworld.org/Vol.15/September-2022/9.pdfcoagulase-negative staphylococcicowsmeca genepolymerase chain reactionsubclinical mastitis |
| spellingShingle | Eman S. Ibrahim Sohad M. Dorgham Asmaa S. Mansour Abeer M. Abdalhamed Doaa D. Khalaf Genotypic characterization of mecA gene and antibiogram profile of coagulase-negative staphylococci in subclinical mastitic cows Veterinary World coagulase-negative staphylococci cows meca gene polymerase chain reaction subclinical mastitis |
| title | Genotypic characterization of mecA gene and antibiogram profile of coagulase-negative staphylococci in subclinical mastitic cows |
| title_full | Genotypic characterization of mecA gene and antibiogram profile of coagulase-negative staphylococci in subclinical mastitic cows |
| title_fullStr | Genotypic characterization of mecA gene and antibiogram profile of coagulase-negative staphylococci in subclinical mastitic cows |
| title_full_unstemmed | Genotypic characterization of mecA gene and antibiogram profile of coagulase-negative staphylococci in subclinical mastitic cows |
| title_short | Genotypic characterization of mecA gene and antibiogram profile of coagulase-negative staphylococci in subclinical mastitic cows |
| title_sort | genotypic characterization of meca gene and antibiogram profile of coagulase negative staphylococci in subclinical mastitic cows |
| topic | coagulase-negative staphylococci cows meca gene polymerase chain reaction subclinical mastitis |
| url | http://www.veterinaryworld.org/Vol.15/September-2022/9.pdf |
| work_keys_str_mv | AT emansibrahim genotypiccharacterizationofmecageneandantibiogramprofileofcoagulasenegativestaphylococciinsubclinicalmastiticcows AT sohadmdorgham genotypiccharacterizationofmecageneandantibiogramprofileofcoagulasenegativestaphylococciinsubclinicalmastiticcows AT asmaasmansour genotypiccharacterizationofmecageneandantibiogramprofileofcoagulasenegativestaphylococciinsubclinicalmastiticcows AT abeermabdalhamed genotypiccharacterizationofmecageneandantibiogramprofileofcoagulasenegativestaphylococciinsubclinicalmastiticcows AT doaadkhalaf genotypiccharacterizationofmecageneandantibiogramprofileofcoagulasenegativestaphylococciinsubclinicalmastiticcows |