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Background  Plant extracts were evaluated on poultry bacteria known to be threatening public health. This is to develop better bio-therapeutic agents from plant origin.    Methods  Bacteria were isolated from water, feed, crop, gizzard and faeces of layer chicken. Isolates of interest ( Escherichia coli ,  Salmonella enteritidis ,  Pseudomonas aeruginosa  and  Klebsiella oxytoca ) were subjected to antibiotic susceptibility test. Resistant strains were further evaluated against different plant extracts in comparison to Meropenem (control) using agar diffusion method.    Results    E. coli  had the highest occurrence (53 %), followed by  P. aeruginosa  (25 %) and then  S. enteritidis  (13 %) while the least was  K. oxytoca  (9 %). Virtually all the isolates exhibited multi-antibiotic resistance (MAR) with gross resistance to Amoxicillin, Erythromycin and Cefuroxine.  P. aeruginosa  (75 %),  S. enteritidis  (75 %) and  E. coli  (63 %), had the highest MAR. Out of the 11 (100 %) plant extracts evaluated, 7 (64 %) were outstanding and showed varied levels of antibacterial activity. Specifically, methanol extract of  Mangifera indica  Julie cultivar leaf (MJLM) had the highest antibacterial activity, followed by  Euadenia trifoliata  stem bark (TB03) and  Euadenia eminens  leaf (TB05).  P. aeruginosa  was highly susceptible (81.81 %) to the extracts, followed by  S. enteritidis  (63.64 %) and then  E. coli  (27.27 %).    Conclusions  MJLM and other extracts have proven to be promising extracts in which to search for bioactive components that can be developed into therapeutic drugs. This may help in the management of antibiotic resistant bacterial isolates from poultry chicken threatening public health.

Evaluation of therapeutic potentials of plant extracts against poultry bacteria threatening public health