Antimicrobial resistance and virulence genes of Streptococcus agalactiae isolated from mastitis milk samples in China

Streptococcus agalactiae is an important zoonotic pathogen that affects milk production and quality and poses a threat to public health. Treatment of infections with this bacterium exploits antimicrobials, to which the resistance of S. agalactiae is a growing problem. Addressing the possibility of a correlation between this pathogen’s genetic factors for antimicrobial resistance and virulence, this study attempted to identify the relevant genes.

Material and Methods

Antimicrobial resistance of S. agalactiae isolated from 497 Chinese bovine mastitic milk samples was detected by the broth microdilution method. Eight drug resistance genes and eleven virulence genes were detected using PCR.

Results

Streptococcus agalactiae was 100% susceptible to rifampicin and vancomycin, 93.33% susceptible to sulfisoxazole and sulfamethoxazole, but 100% resistant to ≥3 of the 16 antimicrobial agents, thereby being multidrug resistant, with resistance to oxacillin, tetracycline, erythromycin, clindamycin, and gentamicin being common. The ermB, ermA and lnuA genes were carried by 73.33%, 66.67% and 60.00% of the strains, respectively. The carriage rates of the glnA, clyE, hylB, bibA, iagA, and fbsA virulence genes were greater than 40%, lmb and bac were not observed in any strain, and glnA+hylB+bibA+iagA+fbsA+clyE combined virulence gene patterns were the most commonly detected.

Conclusion

Antimicrobial resistance of S. agalactiae is still a great concern for cattle health in China, and multidrug resistance coupled with the high positive rates of this bacterium’s strains for virulence genes indicates the importance of S. agalactiae surveillance and susceptibility tests.

Sprache:: Englisch

Zeitrahmen der Veröffentlichung:: 4 Hefte pro Jahr
Fachgebiete der Zeitschrift:: Biologie, Molekularbiologie, Mikrobiologie und Virologie, Biologie, andere, Medizin, Veterinärmedizin

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Antimicrobial resistance and virulence genes of Streptococcus agalactiae isolated from mastitis milk samples in China

Yankun Zhao

Wei Shao

Fulan Wang

Jiaoxiao Ma

He Chen

Shuai Wang

Yating Wu

Cheng Wang

Nan Zheng

Jiaqi Wang

Huimin Liu

Online veröffentlicht: 16. Dez. 2022

Seitenbereich: 581 - 590

Eingereicht: 07. Mai 2022

Akzeptiert: 05. Dez. 2022

DOI: https://doi.org/10.2478/jvetres-2022-0069

Schlüsselwörtercattle, bovine mastitis, dairy industry, antimicrobial stewardship, virulence gene

© 2022 Y. Zhao et al. published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Introduction

Material and Methods

Results

Conclusion

Schlüsselwörter
cattle, bovine mastitis, dairy industry, antimicrobial stewardship, virulence gene