Pseudomonas species from cattle dung producing extended spectrum and metallo beta-lactamases

Indiscriminate use of antibiotics in livestock contributes to emergence of antimicrobial resistance in pathogens co-habiting the gastro-intestinal tract of animals. This study was to determine the Extended Spectrum Beta-Lactamase (ESBL) and Metallo-Beta-Lactamase (MBL) production in Pseudomonas species from cattle fecal samples. Cattle dungs were collected from the University of Ibadan Cattle Ranch and the Pseudomonas species isolated using Pseudomonas Base Agar with Pseudomonas CN Selective Supplement were identified using standard tests. Phenotypic detection of ESBL and MBL was by double disk synergy test and Ethylene Di-amine Tetra Acetic Acid Combined Disk Test respectively. Antibiotics susceptibility tests was done using the disc diffusion technique against ten antibiotics. A total of 144 Pseudomonas species were isolated and identified as P. aeruginosa (71.5%), P. fluorescens (19.4%) and P. stutzeri (9.1%) and 19 (37.1%) produced ESBL including P. aeruginosa (15), P. fluorescens (2) and P. stutzeri (2) while, one (6.7%) ESBL P. aeruginosa produced MBL. All the ESBL producers were resistant to cefotaxime and trimethoprim; resistance of P. aeruginosa to ciprofloxacin was 93.3% and to ceftazidime was 80.0%, while it was 13.3% (colistin) and 6.7% (imipenem). The ESBL producing P. fluorescens were resistant to ceftazidime, ciprofloxacin and trimethoprim, likewise, the ESBL producing P. stutzeri showed resistance to gentamicin, ciprofloxacin and trimethoprim. The production of ESBL and MBL observed among the Pseudomonas species in this study with high level of resistance to some antibiotics portend public health risk, hence a need for caution in the use of antibiotics in animal husbandry.