Egyptian Journal of Medical Human Genetics

Table 3 Biochemical characterization of S. aureus isolates

From: Prevalence of enterotoxin genes (SEA to SEE) and antibacterial resistant pattern of Staphylococcus aureus isolated from clinical specimens in Assiut city of Egypt

Name of test	No. of isolates
Name of test	No	%
Catalase	Positive for all isolates	100
Coagulase by rabbit plasma
Slide	Positive for 25 isolates	54.4
Tube	Positive for 21 isolates	45.6
DNase agar	Positive for all isolates	100
Crystal violet agar
Purple colonies	39 isolates	84.7
White colonies	3 isolates	6.5
Yellow colonies	4 isolates	8.6
Nitrate reduction	Positive for all isolates	100
Baird parker medium	Positive for all isolates	100
Indole production test	Negative for all isolates	100
Methyl red test	Positive for all isolates	100
Voges Prausker test	Positive for all isolates	100
Citrate utilization	Negative for all isolates	100
Gelatin hydrolysis	Positive for all isolates	100
Casein hydrolysis test	Positive for all isolates	100

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