Antimikrobna osjetljivost uzročnika mastitisa krava s područja sjeverozapadne Hrvatske u razdoblju od 2014. do 2018. godine

Sukalić, Tomislav; Đuričić, Dražen; Pavljak, Ivica; Končurat, Ana; Cvetnić, Željko; Grbavac, Jozo; Bačanek, Branko; Jurmanović, Jadranka; Samardžija, Marko

doi:10.46419/vs.52.2.10

Cited by 2 publications

(1 citation statement)

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“…A prolonged course of treatment and dosage adjustment is required. Other studies have reported evidence of quinolone resistance in China [46], Croatia [57], and Slovakia [58]. However, it is important to note that quinolone resistance is acquired through the accumulation of various resistance mechanisms within a single bacterial strain and can be transferred to others [59].…”

Section: Discussionmentioning

confidence: 99%

Characterization of Virulence Factors and Antimicrobial Susceptibility of Streptococcus agalactiae Associated with Bovine Mastitis Cases in Thailand

Wataradee,

Boonserm,

Samngamnim

et al. 2024

Animals

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Streptococcus agalactiae is a contagious pathogen that causes bovine mastitis. The ability of S. agalactiae to cause widespread mastitis relies on bacterial virulence factors. In this study, we detected 10 virulence determinants associated with mastitis pathogenicity using conventional PCR. The antimicrobial susceptibility of 100 S. agalactiae isolates from 13 Thai dairy herds was assessed using the Kirby–Bauer disk diffusion susceptibility test. All strains had at least three virulence factors responsible for invasion, adhesion, and infection (fbsB, bibA, and cfb, respectively). The predominant virulent profile of S. agalactiae strains revealed the presence of fbsA, fbsB, bibA, cfb, and cyl (n = 96). Most strains were sensitive to penicillin, ampicillin, amoxicillin-clavulanic acid, cefotaxime, ceftiofur, erythromycin, sulfamethoxazole-trimethoprim, and vancomycin. However, all strains were resistant to aminoglycosides, including kanamycin and gentamicin attributed to the unnecessary antimicrobial use. Furthermore, we identified seven multidrug resistant (MDR) S. agalactiae strains among four dairy herds, of which, two were vancomycin resistant. Our study provides profiles for virulence factors and antimicrobial susceptibility, which are beneficial for the clinical monitoring, prevention, and control of bovine mastitis in dairy cattle in Thailand. Moreover, we emphasize the need for awareness regarding the judicious use of antimicrobials on dairy farms.

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