Detection and survival of Listeria monocytogenes in milk and dairy products.
Detection of L. monocytogenes in raw and pasteurized milk, Zabady, Karish, Domiati and Romi cheeses were done in this study using direct and cold enrichment methods. Out of 140 samples 3 samples were positive by cold enrichment and they were 2 of raw milk and one of Domiati cheese. Survival of L. monocytogenes was studied during heat treatment of milk by the sealed tube method of inactivation and it was found that L. monocytogenes inactivated completely at 60 degrees C for 15 minutes. There was a statistically inverse correlation between time of storage of dairy products and viable cell count of L. monocytogenes. PH played an important role in survival of that pathogen.
El-Shamy
H A
HA
Dairy Microbiology Dept., Faculty of Agriculture.
El-Molla
A H
AH
Abou Donia
S A
SA
Medhagi
A K
AK
D000818:Animals; D015930:Diet Records; D004534:Egypt; D005516:Food Microbiology; D008089:Listeria monocytogenes / Q000302:isolation & purification*; D008892:Milk