The Frequency and Antibiotic Resistance Pattern of Aeromonas hydrophila and Yersinia ruckeri Isolated from Diseased Rainbow Trout Cultured in Chaharmahal and Bakhtiari Province

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Panahifar Nima; POURNIA MOHSEN; Salighehzadeh Reza; Mosafer Marjan

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Journal Paper

Paper Information

Journal: JOURNAL OF ANIMAL BIOLOGY Year:2022 | Volume:15 | Issue:4 Page(s): 147-154

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Information Journal Paper

Title

The Frequency and Antibiotic Resistance Pattern of Aeromonas hydrophila and Yersinia ruckeri Isolated from Diseased Rainbow Trout Cultured in Chaharmahal and Bakhtiari Province

Author(s)

Panahifar Nima | POURNIA MOHSEN | Salighehzadeh Reza | Mosafer Marjan | Issue Writer Certificate

Keywords

Oncorhynchus mykissQ4

Antibiotic SusceptibilityQ4

Aeromonas hydrophilaQ4

Yersinia ruckeriQ4

Chaharmahal and Bakhtiari ProvinceQ4

Abstract

Recognition of resistance and susceptibility of problematic bacteria such as Yersinia ruckeri and Aeromonas hydrophila in rainbow trout farms, in proper selection of antibiotics and infection control in breeding ponds. It plays an effective role. In this study, 100 diseased fish were collected from rainbow trout farms in Chaharmahal and Bakhtiari Province and after performing biochemical tests and purification of Aeromonas hydrophila and Yersinia ruckeri species, using PCR test with specific primers were finally approved. Antibiotic Susceptibility of bacteria was investigated by disk diffusion method by culture on Müller-Hinton agar medium. Examination of the results of antibiogram of Aeromonas hydrophila isolates showed that the highest resistance was related to the antibiotics ampicillin (100%), colistin (80%), enrofloxacin (80%), flumquin (80%) and then, Compared to tetracycline (60%) and fluorophenicol (60%) antibiotics. The most sensitive isolates were related to trimethoprim-sulfamethoxazole (60%) and phosphomycin (60%) antibiotics. Examination of the antibiogram results of Yersinia ruckeri isolates showed that the highest resistance among the isolates was related to the antibiotics ampicillin (100%), erythromycin (100), trimethoprim-sulfamethoxazole (100%) and colistin (83. 34%) and then showed about 67% resistance to tetracycline, fluorophenicol and phosphomycin antibiotics. Resistance to the antibiotics flumequin, lincomycin + spectinomycin (lincospectin) and enrofloxacin were also observed to be 50%, which means that none of these antibiotics would be a viable option for the treatment of bacterial infections caused by Yersinia ruckeri. In order to avoid growing bacterial resistance and to take the most effective decision in terms of antibiotic therapy, usage of antibiotics without antibiogram must be avoided.

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