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Evidence of vancomycin-resistant Staphylococcus aureus, multidrug-resistant S. aureus, and Enterococcus faecium-causing mastitis in Thailand and Cambodia

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Title: Evidence of vancomycin-resistant Staphylococcus aureus, multidrug-resistant S. aureus, and Enterococcus faecium-causing mastitis in Thailand and Cambodia
Authors: Sambo Na, Montira Intanon, Anyaphat Srithanasuwan, Wasana Chaisri, Witaya Suriyasathaporn
Source: Veterinary World, Vol 18, Iss 1, Pp 202-209 (2025)
Publisher Information: Veterinary World, 2025.
Publication Year: 2025
Collection: LCC:Animal culture
LCC:Veterinary medicine
Subject Terms: antimicrobial resistance, dairy farms, mastitis, methicillin-resistant staphylococcus aureus, multidrug resistance, vancomycin-resistant enterococci, vancomycin-resistant staphylococcus aureus, Animal culture, SF1-1100, Veterinary medicine, SF600-1100
More Details: Background and Aim: Bovine mastitis, an inflammatory condition of the mammary gland, is a critical economic issue in the dairy industry. Antimicrobial resistance (AMR) to mastitis-causing pathogens poses a significant threat to dairy operations in Thailand and Cambodia. This study investigates the AMR of mastitis pathogens in Thailand and Cambodia. It focuses on detecting methicillin-resistant Staphylococcus aureus, vancomycin-resistant S. aureus (VRSA), and vancomycin-resistant enterococci by identifying the presence of mecA, vanA, and vanB genes in bacterial isolates. Materials and Methods: A total of 65 bacterial isolates (55 S. aureus from Thailand and 10 Enterococcus faecium from Thailand and Cambodia) were analyzed. Disk diffusion tests were conducted for antibiotic susceptibility, and polymerase chain reaction was employed to detect AMR genes. Results: S. aureus isolates showed resistance to penicillin (21.8%), tetracycline (9.1%), and gentamycin (7.3%). Three isolates were identified as multidrug-resistant (MDR), resistant to tetracycline, gentamycin, and penicillin. E. faecium isolates exhibited high resistance to tetracycline (100%) and penicillin (90%), with 60% classified as MDR. Phenotypic analysis identified VRSA in 11% of S. aureus isolates. However, mecA, vanA, and vanB genes were not detected in any isolate. Conclusion: Mastitis pathogens in this study pose significant AMR challenges, especially with MDR S. aureus and E. faecium, and phenotypically VRSA without the vanA gene. The findings highlight the need for judicious antibiotic use in dairy farms and further studies with broader sampling.
Document Type: article
File Description: electronic resource
Language: English
ISSN: 0972-8988
2231-0916
Relation: https://www.veterinaryworld.org/Vol.18/January-2025/22.pdf; https://doaj.org/toc/0972-8988; https://doaj.org/toc/2231-0916
DOI: 10.14202/vetworld.2025.202-209
Access URL: https://doaj.org/article/a8424f1f75f84381a8a779b011410bc5
Accession Number: edsdoj.8424f1f75f84381a8a779b011410bc5
Database: Directory of Open Access Journals
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  Data: Evidence of vancomycin-resistant Staphylococcus aureus, multidrug-resistant S. aureus, and Enterococcus faecium-causing mastitis in Thailand and Cambodia
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  Data: Veterinary World, Vol 18, Iss 1, Pp 202-209 (2025)
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  Data: Background and Aim: Bovine mastitis, an inflammatory condition of the mammary gland, is a critical economic issue in the dairy industry. Antimicrobial resistance (AMR) to mastitis-causing pathogens poses a significant threat to dairy operations in Thailand and Cambodia. This study investigates the AMR of mastitis pathogens in Thailand and Cambodia. It focuses on detecting methicillin-resistant Staphylococcus aureus, vancomycin-resistant S. aureus (VRSA), and vancomycin-resistant enterococci by identifying the presence of mecA, vanA, and vanB genes in bacterial isolates. Materials and Methods: A total of 65 bacterial isolates (55 S. aureus from Thailand and 10 Enterococcus faecium from Thailand and Cambodia) were analyzed. Disk diffusion tests were conducted for antibiotic susceptibility, and polymerase chain reaction was employed to detect AMR genes. Results: S. aureus isolates showed resistance to penicillin (21.8%), tetracycline (9.1%), and gentamycin (7.3%). Three isolates were identified as multidrug-resistant (MDR), resistant to tetracycline, gentamycin, and penicillin. E. faecium isolates exhibited high resistance to tetracycline (100%) and penicillin (90%), with 60% classified as MDR. Phenotypic analysis identified VRSA in 11% of S. aureus isolates. However, mecA, vanA, and vanB genes were not detected in any isolate. Conclusion: Mastitis pathogens in this study pose significant AMR challenges, especially with MDR S. aureus and E. faecium, and phenotypically VRSA without the vanA gene. The findings highlight the need for judicious antibiotic use in dairy farms and further studies with broader sampling.
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  Data: https://www.veterinaryworld.org/Vol.18/January-2025/22.pdf; https://doaj.org/toc/0972-8988; https://doaj.org/toc/2231-0916
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