الفهرس 
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Abstract
In this work 68 S. aureus isolated from mastitic cows (n=48), camel milk (n=5) and 15 human samples (urine n = 4, abscesses aspiration n = 3, sputum n = 2, nasal swabs n = 2, vaginal swab n = 1 and wound swabs n = 3) were investigated using phenotypic and molecular identification to detect the occurrence of enterotoxins. Eighteen out of 48 S. aureus isolated from mastitic cows and 5 out of 15 S. aureus isolated from human samples were enterotoxin producers. All toxigenic S. aureus isolated from clinical mastitic cows (13) were toxin type D producer while seband sed were detected from subclinical mastitic cows. Among human isolates, 2 isolates produced mixed toxins A and E, 2 isolates produced mixed toxins C and D and one isolate produced type C toxin. No toxin was detected from camel isolates. Five S. aureus crude enterotoxin type D were investigated by protein SDS-PAGE. It was clear that all isolates had from 7 to 9bands. All the isolates had a band at 147-159 kDa, 35-42 kDa, 28-30 kDa, 23-26 kDa, 20-22 kDa and 18-19 kDa. 4 isolates had a band at 48-55 kDa, 3 isolates had a band at 39-42 kDa, 3 isolates had a band at 31-34 kDa and one isolate had a band at 17kDa.