Incidence of Listeria monocytogenes in frozen beef, poultry and fish in Assuit city [electronic resource].

Includes reference.

The present study was preformed on 90 frozen samples of meat, poultry and fish (30 of each). The samples were collected from different shops in Assiut city. Listeria species were isolated from 33% of frozen meat, 60% of frozen poultry and 53% of frozen fish. Also they were counted in the examined samples, the mean counts were 2.9±1.9xI03, 5.65± 4.7xHr and l2.75± 6.8 xl02 CFU/g of the examined frozen meat, poultry and fish respectively. Listeria monocytogenes was differentially identified from other Listeria species and could be isolated at variable percentages: 16.6% in frozen meat, 33% in frozen poultry and 13.3% in frozen fish. The study revealed that the incidence of L.monocytogenes was higher in frozen poultry as compared to both frozen meat and fish. The drug susceptibility characterization of L.maonocytogenes cleared that all isolates (100%) were resistant to Gentamicin and Ampicillin but were susceptible (100%) to Chloramphenicol and Norfloxacin, while the other used antibiotics showed different degrees of antimicrobial sensitivity reactions for Streptomycin, Tetracycline, Rifampin, Cefadroxil and Cefotaxime.

Summary in Arabic.