Isolation and identification of Staphylococcus aureus from antibiotic treated chicks

In this study we made Isolation and identification of S. aureusfrom baby chicks by taking 300specimens from 100 diseased chicksfrom different Egyptian govemorates, including (Dakahleia,Damietta, Kafr el-Sheikh and Gharbia), made isolation andidentification , sensitivity test and Per Jest to the coagulase positiveScaureus .By bacteriological examination of these specimens we foundthat a total of 139 out of 300 with percentage of 46.3% were foundpositive for Staph. species and 161 out of 300 with percentage of53.6% were negative for Staph. species and atotal of 26 specimens ofl39 with percentage 18.7% were found coagulase positive and 113specimens of l39 with percentage of 81.2% were found coagulasenegative.The isolated coagulase positive S.aureus of diseased chicksfrom different was from Liver, yolk sac, and heart with percentagesof 40.3 %,33.9%,25.8 %, respectively.Examination of 26 samples of coagulase positive S.aureusagainst 8 antimicrobial discs revealed different percentage ofsensitivity as it illustrated in Table (7) and. In regard to Oxacillin 21coagulase positive S.aureus was resistant (80.76%) while, 5 strainswere intermediate (19.23%). On the other hand 3 (1l.53%) of thestrains were resistant and 23 (88.46%) sensitive to vancomycin. 7(26.92%) of the strains were resistant while, 19 (73.07%) weresensitive to Gentamycin. But 1 (3.84%) and 25 (96.15%) of thestrains were resistant and sensitive to ciprofloxacin, respectively. Onthe other hands,15 (57.69%) of the strains were resistant, while, 2