الفهرس 
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Abstract
In this study we made Isolation and identification of S. aureus
from baby chicks by taking 300specimens from 100 diseased chicks
from different Egyptian govemorates, including (Dakahleia,
Damietta, Kafr el-Sheikh and Gharbia), made isolation and
identification , sensitivity test and Per Jest to the coagulase positive
Scaureus .
By bacteriological examination of these specimens we found
that a total of 139 out of 300 with percentage of 46.3% were found
positive for Staph. species and 161 out of 300 with percentage of
53.6% were negative for Staph. species and atotal of 26 specimens of
l39 with percentage 18.7% were found coagulase positive and 113
specimens of l39 with percentage of 81.2% were found coagulase
negative.
The isolated coagulase positive S.aureus of diseased chicks
from different was from Liver, yolk sac, and heart with percentages
of 40.3 %,33.9%,25.8 %, respectively.
Examination of 26 samples of coagulase positive S.aureus
against 8 antimicrobial discs revealed different percentage of
sensitivity as it illustrated in Table (7) and. In regard to Oxacillin 21
coagulase positive S.aureus was resistant (80.76%) while, 5 strains
were intermediate (19.23%). On the other hand 3 (1l.53%) of the
strains were resistant and 23 (88.46%) sensitive to vancomycin. 7
(26.92%) of the strains were resistant while, 19 (73.07%) were
sensitive to Gentamycin. But 1 (3.84%) and 25 (96.15%) of the
strains were resistant and sensitive to ciprofloxacin, respectively. On
the other hands,15 (57.69%) of the strains were resistant, while, 2