الفهرس 
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Abstract
Listeria monocytogenes is a psychrotrophic, facultative, Gram positive short rod bacterium that has been emerged in recent years as an important food borne pathogen. The organism is ubiquitous in nature. Foods as milk and cheese have been implicated in human outbreaks of listeriosis which is characterized by septicaemia, meningitis and abortion, with up to 30% mortality rate, particularly for neonates, elderly, immunosuppressed and pregnant.
In the current study, three hundred samples of which 200 milk samples and 25 each of Damietta, processed, Edam and hard (Ras) cheeses were randomly collected from dairy shops and supermarkets in Alexandria province, Egypt. The collected samples were subjected for chemical and bacteriological examinations.
Milk:
The mean pH value of milk samples was 6.68 while the mean acidity percent was 0. 157%. This level of acidity not affect the growth of Listeria species.
Listeria species were found in 6% of milk samples. L. monocytogenes, L. innocua, L. murrayi, L. weishimeri and L. seeligeri could be detected in 2.5, 4.5, 1.5, 1 and 0.5% of examined milk samples, respectively.