Publication: Efficacy of heat-killed and formalin-killed vaccines against Tilapia tilapinevirus in juvenile Nile tilapia (Oreochromis niloticus)
Issued Date
2021-12-01
Resource Type
ISSN
13652761
01407775
01407775
Other identifier(s)
2-s2.0-85114091675
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Mahidol University
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SCOPUS
Bibliographic Citation
Journal of Fish Diseases. Vol.44, No.12 (2021), 2097-2109
Suggested Citation
Thao Thu Mai, Pattanapon Kayansamruaj, Suwimon Taengphu, Saengchan Senapin, Janina Z. Costa, Jorge del-Pozo, Kim D. Thompson, Channarong Rodkhum, Ha Thanh Dong Efficacy of heat-killed and formalin-killed vaccines against Tilapia tilapinevirus in juvenile Nile tilapia (Oreochromis niloticus). Journal of Fish Diseases. Vol.44, No.12 (2021), 2097-2109. doi:10.1111/jfd.13523 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/75529
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Title
Efficacy of heat-killed and formalin-killed vaccines against Tilapia tilapinevirus in juvenile Nile tilapia (Oreochromis niloticus)
Other Contributor(s)
Suan Sunandha Rajabhat University
Chulalongkorn University
University of Edinburgh, Roslin Institute
Kasetsart University
Moredun Research Institute
Mahidol University
Thailand National Center for Genetic Engineering and Biotechnology
Asian Institute of Technology Thailand
Biotechnology Center of Ho Chi Minh City
Chulalongkorn University
University of Edinburgh, Roslin Institute
Kasetsart University
Moredun Research Institute
Mahidol University
Thailand National Center for Genetic Engineering and Biotechnology
Asian Institute of Technology Thailand
Biotechnology Center of Ho Chi Minh City
Abstract
Tilapia tilapinevirus (also known as tilapia lake virus, TiLV) is considered to be a new threat to the global tilapia industry. The objective of this study was to develop simple cell culture-based heat-killed (HKV) and formalin-killed (FKV) vaccines for the prevention of disease caused by TiLV. The fish were immunized with 100 µl of either HKV or FKV by intraperitoneal injection with each vaccine containing 1.8 × 106 TCID50-inactivated virus. A booster vaccination was carried out at 21-day post-vaccination (dpv) using the same protocol. The fish were then challenged with a lethal dose of TiLV at 28 dpv. The expression of five immune genes (IgM, IgD, IgT, CD4 and CD8) in the head kidney and spleen of experimental fish was assessed at 14 and 21 dpv and again after the booster vaccination at 28 dpv. TiLV-specific IgM responses were measured by ELISA at the same time points. The results showed that both vaccines conferred significant protection, with relative percentage survival of 71.3% and 79.6% for HKV and FKV, respectively. Significant up-regulation of IgM and IgT was observed in the head kidney of fish vaccinated with HKV at 21 dpv, while IgM, IgD and CD4 expression increased in the head kidney of fish receiving FKV at the same time point. After booster vaccination, IgT and CD8 transcripts were significantly increased in the spleen of fish vaccinated with the HKV, but not with FKV. Both vaccines induced a specific IgM response in both serum and mucus. In summary, this study showed that both HKV and FKV are promising injectable vaccines for the prevention of disease caused by TiLV in Nile tilapia.