Detection and distribution of virulence genes in Aeromonas hydrophila ‎isolates causing infection in cultured carps ‎

Publish Year: 1401
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:

JR_VRFAN-13-1_008

تاریخ نمایه سازی: 25 آبان 1402

Abstract:

Aeromonas hydrophila is a bacterium associated with many diseases and disorders such as fin rot, skin ulcers and lethal hemorrhagic septicemia in fish. It bears several virulence factors including type III secretion system (T۳SS), aerolysin, cytolytic enterotoxin and enzymes (e.g. hemolysins, lipase) that seem to play an important role in its pathogenesis. Detection of virulence markers by polymerase chain reaction (PCR) is a key procedure in defining the pathogenic ability of pathogenic bacteria and preparing a vaccine for its treatment. In this sense, this study was aimed to determine the frequency of virulence genes in isolates obtained from infected cultured carps in Khuzestan province. Out of ۲۰۰ moribund carps with septicemic symptoms, ۱۲۵ isolates were belonged to the motile aeromonads and ۵۹ isolates were identified as A. hydrophila by biochemical methods. Finally, using PCR analysis, ۳۱ isolates were identified as A. hydrophila. Five virulence genes were detected in these isolates including hemolysin, aerolysin, cytolytic enterotoxin and T۳SS (aopB and ascV) by specific primers. Results showed that ۲۳ (۷۴.۱۹%), ۱۸ (۵۸.۰۶%), ۱۶ (۵۱.۶۱%), ۱۳ (۴۱.۶۳%) and ۱۰ (۳۲.۲۵%) isolates possessed cytolytic enterotoxin, hemolysin, aerolysin, and T۳SS genes, respectively. The results of the present study showed that among ۳۱ isolates, only five isolates had all of dominant virulence genes. Thirteen other isolates had genotypes including hlyA+, aerA+, and act+. The remaining isolates had at least one virulence gene. This study showed that determination of the virulence genes by PCR can be a reliable method to identify a potential pathogenic Aeromonad strain.

Authors

Mina Ahangarzadeh

South of Iran Aquaculture Research Institute, Iranian Fisheries Science Research Institute, Agricultural Research Education and Extension ‎Organization (AREEO), Ahvaz, Iran‎

Masoud Ghorbanpour Najafabadi

Department of Pathobiology, Faculty of Veterinary Medicine, Shahrekord University, Shahrekord, Iran

Rahim Peyghan

Department of Aquatic Animal Health, Faculty of Veterinary Medicine, Shahid Chamran University of Ahvaz, Ahvaz, Iran‎

Hossein Houshmand

South of Iran Aquaculture Research Institute, Iranian Fisheries Science Research Institute, Agricultural Research Education and Extension ‎Organization (AREEO), Ahvaz, Iran‎

Mostafa Sharif Rohani

Department of Fish diseases, Iranian Fisheries Research Science Institute (IFSRI), Agriculture Research, Education and Extension Organization (AREEO), Tehran, Iran

Mehdi Soltani

Department of Aquatic Animal Health, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran

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