Stability of Resistance Induced by Escherichia coli in Comparison with That Carried by Clinical Isolates in Vivo


ackground: The increasing incidence of resistance to a wide range of antibiotics bymicroorganisms is a major concern facing modern medicine because these antibioticsare widely used in human and veterinary medicine to treat and prevent diseases and asgrowth promoters in animal intensive industries. The consequences are severe. Infectionscaused by resistant microbes fail to respond to treatment, resulting in prolonged illness andgreater risk of death.Objectives: The aims of this study are: 1-Comparing the changes of induced resistance inE.coli with that present in clinical isolates of the same microorganism. 2-Determine theproperties of cefquinome especially the development of resistance and the stability of itMethods: fourteen strains of E.coli were collected from different disease cases: diarrhea(children= 6, calve= 3, poultry= 1), UTI (urine= 2), mastitis (milk= 2) from Al-Yarmookhospital and farms of veterinary college (Baghdad). The MIC was estimated eight selectedstrains (4 sensitive and 4 resistances) before and after passages these strains in vivo forcarried out the comparison.Results: A significant drop in induced resistance for sensitive strains as compared withclinical isolates which are not significant elevate in resistance. Most E.coli strains showedhighly susceptible to cefquinome but some of them were appeared resistance although thisantibacterial was newly used in this country.Conclusion: loss of induced resistance when passing in vivo because the resistantmicroorganisms actually were unstable group when comparison with stable resistance inclinical isolates was not changed when exposed to the same condition.Keywords: E. coli, MIC, in vivo, antibacterial.