The study was designed to isolate predominance contamination of Pseudomonas aeruginosa in marketed raw buffalo milk (n=122) samples, collected from private dairy farms from different places of south Gujarat, India. Pre-enrichment of 1 ml of each sample was done with inoculation in 9 ml tryptone soya broth and incubated at 37ºC for 24 hrs. A loopful of culture was taken from broth and streaked on selective Pseudomonas agar F plates and incubated at 37ºC for 24 hrs, after completion of incubation period, the colonies characteristics were studied and further confirmed by various biochemical tests and found 14 samples contaminated with P. aeruginosa, were further more biochemical testes are used and give positive results with IMViC, Motility test, catalase and sugar fermentation confirm at 37ºC for 24 hrs incubation. All biochemically conformed isolates were further subjected for molecular characterization and were also tested for antimicrobial susceptibility by using various antibiotics discs such as vancomycin, penicillin, tylosin, cefixime, chloramphenicol, kanamycin, ceftriaxone, cefixime, tetracycline, streptomycin, ciprofloxacin, enrofloxacin, oxytetracycline and gentamicin, which has shown multi drug resistant ranging from seven to nine antimicrobials and Multiple Antibiotic Resistance (MAR) index ranges from 0.50 to 0.64.The isolates of P. aeruginosa in the present study are extremely resistant to vancomycin, penicillin, tylosin, cefixime, chloramphenicol and maximum sensitive to ciprofloxacin and enrofloxacin followed by gentamicin. Further statistical analysis of antibiotics wise zone diameter interpretative standard (mm) reveled susceptibility phenotypes under significant of difference at P≤0.05 in one way ANOVA using Duncan’s multiple range test and found ciprofloxacin having maximum sensitivity among antibiotic tested and it could be considered as a drug of choice for controlling P. aeruginosa mediated animal and human infections in the studied regions for insuring food safety as well.

ABSTRACT. Methanol and ethanol extract showed antibacterial activity in range of 0-11 at 10 mg/mL at against all tested bacterial species. Methanol extract with amoxicillin exhibited effective inhibition E. coli. This combination showed antagonistic effect against B. subtilis and S. aureus. Interaction of ethanol extract with amoxicillin also showed effective inhibition against E. coli and decreased activity against B. subtilis and S. aureus. Methanol extract did not show inhibition against P. aeruginosa but it enhanced activity of ciprofloxacin on combination. Ethanol extract also exhibited effective inhibition against P. aeruginosa on combination with ciprofloxacin. But antagonist effect was observed on interaction of both extract with ciprofloxacin against other bacterial species. Interaction of methanol and ceftazidime showed mostly decreased or indifferent effect against all bacterial species. Ethanol extract with ceftazidime resulted in higher inhibition against E. coli. Combination of methanol extract with erythromycin showed higher inhibition against E. coli and also very effective inhibition against S. aureus. This combination resulted in decreased activity against B. subtilis. Ethanol extract with erythromycin also showed synergistic effect against S. aureus and effective inhibition against E. coli. These results indicate that both methanol and ethanol extract has potential to enhance the combination effect with erythromycin against S. aureus and E. coli.

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I.H. (2019). Toxigenic profiling of enterotoxin-producing Bacillus cereus isolated from marketed raw chicken meat and human subjects by triplex and multiplex PCR.