The agar disk diffusion test was performed for all the recovered P. putida isolates (n = 18) according to the method described by Ali et al. [35 ]. Susceptibility for florfenicol (10 µg), ampicillin (10 µg), erythromycin (15 µg), sulfamethoxazole-trimethoprim (25 µg), ciprofloxacin (5 µg), doxycycline (30 µg), and tylosin (15 µg), Oxoid, UK. Muller-Hinton agar plates (Oxoid, Uk) were incubated at 37 °C for 48 h due to the slow growth rate of the tested isolates. The inhibition zone (mm) was measured to the nearest mm and interpreted according to the breakpoints mentioned [36 (link)].
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