THE ANTIBIOTIC RESISTANCE PHENOMENON IN CITROBACTER STRAINS ISOLATED FROM ANIMALS

Abstract

The therapeutic choice of an antibiotic have to take into account, firstly, the ethiological agent, an also the susceptibility of this pathogen to antibiotics. Microorganisms from Micrococcus genus were isolated from animals and were identified using bacterioscopic and bacteriologic techniques, then were investigated through agar diffusion method about the susceptibility to different groups of antibiotics. The results of this study were interpreted according to the international standards and compared to the work of other researchers. Susceptibility of 100 % was registered for spectinomycin and tetracicline. It was found 66,66 % percentage of the bacterial strains to be sensitive to amoxicillin and 50 % to ampicillin, penicillin and only 33,33 % to potentiated sulfonamide. But the highest percentage of antibacterial resistance (100 %) was observed for flumequine and neomycin, followed by trimethoprim/sulphamethoxazole – 66,66 %, erytromycin – 60 % (in addition, 40 % intremediary strains) and penicillin (in addition, 50 % intermediary strains), ampicillin, kanamycin – 50 % . Although there were no reports of resistance to amoxicillin for the Micrococcus genus in this study, 33,33 % of the strains registered intermediary values for the inhibition areas around the microcomprimates, and 66 % of the bacterial strains presented susceptibility to this antibiotic. In conclusion, we recommend spectinomycin and tetracycline as the first choice for the Micrococcus genus strains, followed by penicillins, according to the results of this study.