E-ISSN 2536-9520 | ISSN 1110-2047
 

Original Article
Online Published: 11 Jan 2014
 


Molecular Characterization of Listeria Species Isolated from Frozen Fish

Gaber S. Abdellrazeq, Ayman M. Kamar, Samya M. El-Houshy.


Abstract
The objective of this study was to investigate the molecular characterization of Listeria species isolated from frozen raw fish. A total of 219 samples consisting of 104 mackerel, 52 horse mackerel, 51 catfish and 12 herring were collected and analyzed by bacteriological, serological, antimicrobial and molecular methods. Overall, 29(56.9%) and 1(0.96%) of catfish samples and mackerel samples respectively were positive for Listeria spp. No Listeria was detected in herring and horse mackerel. In catfish, L. welshimeri (13.7 %) was the most commonly isolated species followed by L. monocytogenes (11.8 %), L. innocua (9.8 %), L. grayi subsp. murrayi (9.8 %), L. grayi subsp. grayi (7.8 %), and L. ivanovii (3.9 %). In mackerel, only L. monocytogenes was detected in one sample. L. monocytogenes isolates serotyped as type 1 and type 4 (3 isolates each) and one non-typeable. Antimicrobial resistance profiling showed all L. monocytogenes isolates were resistant to ampicillin and tetracycline. Two were resistant to erythromycin. However, they were susceptible to rifampicin, vancomycin, chloramphenicol and streptomycin. Four virulence-associated genes (prfA, hlyA, actA and inlA) in addition to the genus gene (prs) were investigated using multiplex PCR. All the isolates were positive for prs gene but, only L. monocytogenes isolates were positive for all tested virulence genes. Our study indicates that imported raw catfish can represent a significant source of L. monocytogenes and potential health risk for listeriosis.

Key words: Listeria monocytogenes Prevalence Antibiotic resistance Virulence genes Basa catfish


 
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How to Cite this Article
Pubmed Style

Gaber S. Abdellrazeq, Ayman M. Kamar, Samya M. El-Houshy. Molecular Characterization of Listeria Species Isolated from Frozen Fish. AJVS. 2014; 40(1): 1-15. doi:10.5455/ajvs.45443


Web Style

Gaber S. Abdellrazeq, Ayman M. Kamar, Samya M. El-Houshy. Molecular Characterization of Listeria Species Isolated from Frozen Fish. https://www.alexjvs.com/?mno=45443 [Access: December 01, 2024]. doi:10.5455/ajvs.45443


AMA (American Medical Association) Style

Gaber S. Abdellrazeq, Ayman M. Kamar, Samya M. El-Houshy. Molecular Characterization of Listeria Species Isolated from Frozen Fish. AJVS. 2014; 40(1): 1-15. doi:10.5455/ajvs.45443



Vancouver/ICMJE Style

Gaber S. Abdellrazeq, Ayman M. Kamar, Samya M. El-Houshy. Molecular Characterization of Listeria Species Isolated from Frozen Fish. AJVS. (2014), [cited December 01, 2024]; 40(1): 1-15. doi:10.5455/ajvs.45443



Harvard Style

Gaber S. Abdellrazeq, Ayman M. Kamar, Samya M. El-Houshy (2014) Molecular Characterization of Listeria Species Isolated from Frozen Fish. AJVS, 40 (1), 1-15. doi:10.5455/ajvs.45443



Turabian Style

Gaber S. Abdellrazeq, Ayman M. Kamar, Samya M. El-Houshy. 2014. Molecular Characterization of Listeria Species Isolated from Frozen Fish. Alexandria Journal of Veterinary Sciences, 40 (1), 1-15. doi:10.5455/ajvs.45443



Chicago Style

Gaber S. Abdellrazeq, Ayman M. Kamar, Samya M. El-Houshy. "Molecular Characterization of Listeria Species Isolated from Frozen Fish." Alexandria Journal of Veterinary Sciences 40 (2014), 1-15. doi:10.5455/ajvs.45443



MLA (The Modern Language Association) Style

Gaber S. Abdellrazeq, Ayman M. Kamar, Samya M. El-Houshy. "Molecular Characterization of Listeria Species Isolated from Frozen Fish." Alexandria Journal of Veterinary Sciences 40.1 (2014), 1-15. Print. doi:10.5455/ajvs.45443



APA (American Psychological Association) Style

Gaber S. Abdellrazeq, Ayman M. Kamar, Samya M. El-Houshy (2014) Molecular Characterization of Listeria Species Isolated from Frozen Fish. Alexandria Journal of Veterinary Sciences, 40 (1), 1-15. doi:10.5455/ajvs.45443





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