Abstract
This study investigated the antibiotic resistance profile of the L. garvieae isolated strains from Jordanian dairy products. Disk diffusion method was used. In particular, different antibiotics were tested against L. garvieae; the antibiotic disks were Trimethoprim (5 µg), Clindamycin (2 µg), Nitrofurantoin (300 µg), Erythromycin (15 µg), Ampicillin (15 µg), Trimethoprim/Sulfamethoxazole (1.25/23.75 µg Polymyxin B (300U) and Tetracycline (30 µg). The results indicated high and statistically significant effects of Trimethoprim, Nitrofurantoin and Trimethoprim/Sulfamthoxazole on L. garvieae. Trimethoprim had the greatest antimicrobial effect on L. garvieae strains. All of the strains were sensitive to this antibiotic. Trimethoprim showed 20 mm inhibition zone in some strains. On the other hand, there were no antibiotic effects of Clindamycin and Polymyxin B on L. garvieae. Slight and statistically insignificant effects were found of other tested antibiotics. The study recommended using Trimethoprim antibiotic against L. garvieae because it inhibited its growths in all isolated cultures.
Highlights
The genus Lactococcus is composed of seven species: L. garvieae, L. fujiensis L. piscium, L. chungangensis, L. plantarum, L. raffinolactis and L. lactis, (Cai et al, 2011)
The antibiotic resistance profiles of L. garvieae isolated strains against eight antimicrobial agents are presented in Table 1 and Fig. 2
Our results indicated that Trimethoprim (5 μg), Nitrofurantoin (300 μg) and Trimethoprim/Sulfamethoxazole (1.25/23.75 μg) had a great antibiotic action against all L. garvieae isolates
Summary
The genus Lactococcus is composed of seven species: L. garvieae, L. fujiensis L. piscium, L. chungangensis, L. plantarum, L. raffinolactis and L. lactis, (Cai et al, 2011). L. garvieae is the only kind that is classified as pathogenic (Facklam and Elliott, 1995; Vendrell et al, 2006). It is identified as an emerging zoonotic pathogen and the etiological agent of the lactococcosis (an emergent disease) in fish. L. garvieae has been the main cause of diseases affecting rainbow trout of fish in many countries around the world. This study is important to determine whether the antibiotic resistance profile of the L. garvieae isolated from different Jordanian dairy products agree with the strains from different areas of the world. The rationale for this study is to determine the antibiotic which inhabits the growth of L. garvieae because it is becoming a risky bacterium that threatens the lives of humans and animals
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