الفهرس 
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Abstract
This study included examination of 46 isolates of B.cereus to detect prevalence of enterotoxin hbl(A,C, d) and nhe A,B,C, the prevalence of these genes were 58.6, 58.6, 58.6, 84.7, 93.4 and 86.9 % respectively. While the prevalence of cpe gene in 20 isolates of C.perfringens was 4%, all these isolates were previously isolated and stored. Study was done on nhe and α gene in bacillus cereus and C.perfringens to detect their sequence. This study includes examination of plant extract (clove, pomegranate, thyme and watercress) to detect their antimicrobial activity on B.cereus and C.perfringens. the highest antimicrobial activity was clove extract on both B.cereus and C.perfringens while the lowest was to thyme and watercress. The control of these organisms in food requires commitment at different levels within the food chain. Good food hygiene habits should be practiced. Efficient heat treatment of milk and dairy products