Molecular characteristics of Staphylococcus aureus strains isolated from subclinical mastitis of water buffaloes in Guangdong Province, China
Intramammary infections (IMI) in animals reared for milk production can result in large economic losses and distress to the animals. Staphylococcus aureus is an important causative agent of IMI in dairy cows, but its prevalence in water buffaloes has not been determined. Therefore, the current study...
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Frontiers Media S.A.
2023-11-01
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| Series: | Frontiers in Veterinary Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fvets.2023.1177302/full |
| _version_ | 1797632967402586112 |
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| author | Dexian Zhang Ximing Lu Xiangyan Feng Xuzeng Shang Qingyou Liu Nan Zhang Hong Yang |
| author_facet | Dexian Zhang Ximing Lu Xiangyan Feng Xuzeng Shang Qingyou Liu Nan Zhang Hong Yang |
| author_sort | Dexian Zhang |
| collection | DOAJ |
| description | Intramammary infections (IMI) in animals reared for milk production can result in large economic losses and distress to the animals. Staphylococcus aureus is an important causative agent of IMI in dairy cows, but its prevalence in water buffaloes has not been determined. Therefore, the current study was conducted to investigate the prevalence of subclinical mastitis in water buffaloes and the antimicrobial susceptibility, virulence genes and biofilm formation abilities of Staphylococcus aureus isolates recovered from water buffaloes in Guangdong, China. Staphylococcus aureus strains were isolated from milk samples of water buffaloes with subclinical mastitis, and twofold microdilution, PCR and crystal violet staining methods were used to determine antimicrobial susceptibility, distributions of virulence and antimicrobial resistance genes and biofilm formation ability, respectively. Our results indicated that 29.44% of water buffaloes were diagnosed with subclinical mastitis, and the most prevalent pathogens were Escherichia coli (96.17%), coagulase-negative staphylococci (CoNS) (67.60%) and S. aureus (28.57%). Most S. aureus isolates showed resistance to bacitracin, doxycycline, penicillin, florfenicol, and tetracycline but were susceptible to ciprofloxacin, ceftizoxime, cefoquinoxime, and ofloxacin. Moreover, 63.72% of S. aureus isolates were positive for tetM, and the prevalence of msrB, blaZ, mecA, fexA, and tetK ranged from 21.24 to 6.19%. All S. aureus isolates harbored clfB and icaA genes, and the virulence genes hla (93.8%), hld (91.15%), clfA (90.27%), fnbA (86.73%), and hlb (83.19%), and tsst, icaD, sec, see, fnbB, and sea showed a varied prevalence ranging from 3.5 to 65.49%. All S. aureus isolates possessed the ability to form biofilms, and 30.09% of isolates showed strong biofilm formation abilities, while 19.47% of isolates were weak biofilm producers. Our results indicated that subclinical mastitis is prevalent in water buffaloes in Guangdong, China, and S. aureus is prevalent in samples from water buffaloes with subclinical mastitis. Most S. aureus isolates were susceptible to cephalosporins and fluoroquinolones; thus, ceftizoxime and cefoquinoxime can be used to treat subclinical mastitis in water buffaloes. |
| first_indexed | 2024-03-11T11:44:14Z |
| format | Article |
| id | doaj.art-0957959eda74488e9a8e5c3181c5a867 |
| institution | Directory Open Access Journal |
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| language | English |
| last_indexed | 2024-03-11T11:44:14Z |
| publishDate | 2023-11-01 |
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| spelling | doaj.art-0957959eda74488e9a8e5c3181c5a8672023-11-09T15:26:04ZengFrontiers Media S.A.Frontiers in Veterinary Science2297-17692023-11-011010.3389/fvets.2023.11773021177302Molecular characteristics of Staphylococcus aureus strains isolated from subclinical mastitis of water buffaloes in Guangdong Province, ChinaDexian Zhang0Ximing Lu1Xiangyan Feng2Xuzeng Shang3Qingyou Liu4Nan Zhang5Hong Yang6School of Life Science and Engineering, Foshan University, Foshan, ChinaSchool of Life Science and Engineering, Foshan University, Foshan, ChinaSchool of Life Science and Engineering, Foshan University, Foshan, ChinaLiaoning Agricultural Development Service Center, Shenyang, ChinaSchool of Life Science and Engineering, Foshan University, Foshan, ChinaSchool of Life Science and Engineering, Foshan University, Foshan, ChinaSchool of Life Science and Engineering, Foshan University, Foshan, ChinaIntramammary infections (IMI) in animals reared for milk production can result in large economic losses and distress to the animals. Staphylococcus aureus is an important causative agent of IMI in dairy cows, but its prevalence in water buffaloes has not been determined. Therefore, the current study was conducted to investigate the prevalence of subclinical mastitis in water buffaloes and the antimicrobial susceptibility, virulence genes and biofilm formation abilities of Staphylococcus aureus isolates recovered from water buffaloes in Guangdong, China. Staphylococcus aureus strains were isolated from milk samples of water buffaloes with subclinical mastitis, and twofold microdilution, PCR and crystal violet staining methods were used to determine antimicrobial susceptibility, distributions of virulence and antimicrobial resistance genes and biofilm formation ability, respectively. Our results indicated that 29.44% of water buffaloes were diagnosed with subclinical mastitis, and the most prevalent pathogens were Escherichia coli (96.17%), coagulase-negative staphylococci (CoNS) (67.60%) and S. aureus (28.57%). Most S. aureus isolates showed resistance to bacitracin, doxycycline, penicillin, florfenicol, and tetracycline but were susceptible to ciprofloxacin, ceftizoxime, cefoquinoxime, and ofloxacin. Moreover, 63.72% of S. aureus isolates were positive for tetM, and the prevalence of msrB, blaZ, mecA, fexA, and tetK ranged from 21.24 to 6.19%. All S. aureus isolates harbored clfB and icaA genes, and the virulence genes hla (93.8%), hld (91.15%), clfA (90.27%), fnbA (86.73%), and hlb (83.19%), and tsst, icaD, sec, see, fnbB, and sea showed a varied prevalence ranging from 3.5 to 65.49%. All S. aureus isolates possessed the ability to form biofilms, and 30.09% of isolates showed strong biofilm formation abilities, while 19.47% of isolates were weak biofilm producers. Our results indicated that subclinical mastitis is prevalent in water buffaloes in Guangdong, China, and S. aureus is prevalent in samples from water buffaloes with subclinical mastitis. Most S. aureus isolates were susceptible to cephalosporins and fluoroquinolones; thus, ceftizoxime and cefoquinoxime can be used to treat subclinical mastitis in water buffaloes.https://www.frontiersin.org/articles/10.3389/fvets.2023.1177302/fullStaphylococcus aureusantimicrobial resistancevirulence genesbiofilm formationsubclinical mastitis in water buffaloes |
| spellingShingle | Dexian Zhang Ximing Lu Xiangyan Feng Xuzeng Shang Qingyou Liu Nan Zhang Hong Yang Molecular characteristics of Staphylococcus aureus strains isolated from subclinical mastitis of water buffaloes in Guangdong Province, China Frontiers in Veterinary Science Staphylococcus aureus antimicrobial resistance virulence genes biofilm formation subclinical mastitis in water buffaloes |
| title | Molecular characteristics of Staphylococcus aureus strains isolated from subclinical mastitis of water buffaloes in Guangdong Province, China |
| title_full | Molecular characteristics of Staphylococcus aureus strains isolated from subclinical mastitis of water buffaloes in Guangdong Province, China |
| title_fullStr | Molecular characteristics of Staphylococcus aureus strains isolated from subclinical mastitis of water buffaloes in Guangdong Province, China |
| title_full_unstemmed | Molecular characteristics of Staphylococcus aureus strains isolated from subclinical mastitis of water buffaloes in Guangdong Province, China |
| title_short | Molecular characteristics of Staphylococcus aureus strains isolated from subclinical mastitis of water buffaloes in Guangdong Province, China |
| title_sort | molecular characteristics of staphylococcus aureus strains isolated from subclinical mastitis of water buffaloes in guangdong province china |
| topic | Staphylococcus aureus antimicrobial resistance virulence genes biofilm formation subclinical mastitis in water buffaloes |
| url | https://www.frontiersin.org/articles/10.3389/fvets.2023.1177302/full |
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