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This study aimed to isolate Pseudomonas aeruginosa from cattle (bovine) milk with mastitis to characterize its antimicrobial susceptibility against some antibiotics, and to identify aminoglycoside acetyltransferase (aac-3-Ib) gene. A total of 100 bovine milk samples were collected randomly from different local cow farms at districts of Wasit governorate, Iraq. Six P. aeruginosa isolates were obtained using bacterial culture method and further identified by Analytical Profile Index (API-20E). The antibiotic sensitivity test was performed by the disc diffusion method. Among the 5 antibiotics used, the highest resistance (100%) was found with Nalidixic acid and tetracycline, followed by gentamicin (50%), and the lowest resistance rate (16.6%, and 33.3%) was to the ciprofloxacin and cephalothin, respectively. PCR was performed for all the gentamicin resistant isolates. The frequency of aac(3)-Ib gene that had a product of 530 bp was 3 of P. aeruginosa isolates. From the findings of the present study, we concluded that P.aeruginosa isolated from mastitic bovine have developed resistance against aminoglycosides through presence of the aac(3)-Ib gene, and the ciprofloxacin and cephalothin can be taken as good choice of treatment.

Antibiotic Susceptibility and Molecular Detection of Pseudomonas aeruginosa Isolated from Bovine Mastitis