Research Article: Effect of extracellular proteins (ECP) on protective efficacy of Yersiniosis vaccine in juvenile rainbow trout (Oncorhynchus mykiss)

سال انتشار: 1401
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 197

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شناسه ملی سند علمی:

JR_JIFRO-21-5_005

تاریخ نمایه سازی: 29 آذر 1401

چکیده مقاله:

Yersiniosis is the second important bacterial infections in coldwater fish culture with significant mortalities and economical losses in the Iranian fish farms. In the present study, the effect of extracellular proteins (ECP) on protective immunity of Y. ruckeri vaccine was evaluated in juvenile rainbow trout (۷±۱.۲ g). For this purpose, ۵۴۰ specimens of juvenile rainbow trout were randomly divided into ۶ groups each in triplicates. Group ۱ (G۱) and Group ۲ (G۲) were orally administrated with formalin killed cells (FKC) and FKC+ECP, respectively. Groups ۳ to ۵ received ECP, FKC, ECP+FKC via intraperitoneal route, respectively. Group ۶ received phosphate buffer saline as the control group. The humoral antibody responses to bacterial antigens were monitored by ELISA. LD۵۰ of Y. ruckeri was determined used probit method sixty days after vaccination. Then, fish in each treatment were challenged intraperitoneally (I.P) with LD۵۰ of Y. ruckeri virulent registered strain in Iran (KCW ۲۹۱۱۵۳). The ELISA results indicated that ECP could increase the serum ELISA antibody titer as the humoral immune response, but ECP with the FKC could increase antibody levels significantly in serum and intestine mucus. Also survival rates in G۱ to G۶ were ۲۵, ۳۱.۲۵, ۳۷.۵, ۵۶.۲۵, ۸۷.۵ and ۱۵ percent, respectively. Among I.P immunized fish the survival rate in G۵ was significantly higher than the other groups. Although in orally vaccinated fish with FKC (G۱) survival rate did not show significant difference with the control group, the FKC /ECP group (G۲) showed a significant increase compared to control group (p=۰.۰۳۹).  It was concluded that supplementing FKC with ECP increased protective immunity of Yersiniosis vaccine principally in I.P. route. Given the great benefits of the oral vaccine, whole cell/ECP can be considered as a protective antigen to design potential vaccines against this pathogenic micro-organism.

نویسندگان

Z. Tulaby Dezfuly

Ph.D. student of Aquatic Science, Faculty of Veterinary Medicine, ShahidChamran University of Ahvaz, Ahvaz, Iran

M. Alishahi

Professor of Department of Clinical Sciences

M. Ghorbanpoor

Professor of Department of microbiology

M.R. Tabandeh

Associate professor of Biochemistry and Molecular Department

M. Mesbah

Professor of Department of Clinical Sciences

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