Ebraheem, Lubna M. <br/><br/>
Comparative study between the effect of gamma irradiation and ozone gas on the incidence of E. Coli O₁₅₇:H₇ in beef burger sold in Assiut governorate  [electronic resource]. 
 دراسة مقارنة بين تأثير اشعة جاما وغاز الاوزون على تواجد ميكروب الايشيريكية القولونية O₁₅₇:H₇ الموجود فى البيف بيرجر المباع فى محافظة أسيوط. 

 - p.123-132. 
<br/><br/>Includes references. 
<br/><br/> This study aimed to determine the prevalence of E. Coli O₁₅₇:H₇ in beef burger, evaluate the effectiveness of gamma irradiation and ozone gas as an antimicrobial intervention on beef burger and evaluate the effect of both on sensory quality of the product. A total of 125 samples of beef burger were collected from different supermarkets in Assiut City, E .coli was isolated from 24 samples (19.2%), further examination using polymemerase chain reaction (PCR) revealed that only one confirmed to be E. coli E. Coli O₁₅₇:H₇ with a percentage of 0.8%. Beef burgers inoculated with E. coli E. Coli O₁₅₇:H₇ at initial level of 106 CFU/g were exposed to different doses of Y:. radiation (2,4 and 6 KGy) at dose rate 2.32 KGy/h at a constant exposure time. The survival of E. coli E. Coli O₁₅₇:H₇ was examined post treatments. Irradiation at doses (4 and 6 KGy) significantly decreased the count proportionally to the applied dose without any sensory changes.   Key words: Incidence, E. coli, E. Coli O₁₅₇:H₇, Beef burger, Gamma, irradiation, ozone gas, sensory. 
<br/><br/><br/>Summary in Arabic. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Escherichia coli O157:H7.<br/>Meat industry and trade--Assiut(Egypt)<br/>Ozone--Therapeutic use.<br/>Ozone--Health aspects.<br/>Food--Effect of radiation on.<br/>Irradiated foods--Assiut(Egypt)<br/>gamma radiation