Abstract
Herpesviral haematopoietic necrosis (HVHN) of gibel carp (Carassius gibelio) is a newly emerged infectious disease caused by cyprinid herpesvirus 2 (CyHV-2) and has caused huge economic losses in aquaculture operations. Currently, no effective methods are available for the control of the disease. In this study, β-propiolactone inactivated cyprinid herpesvirus 2 (CyHV-2) vaccine was prepared, and the immune response and protection in cultured gibel carp after vaccination was thoroughly investigated. This included blood cell counting and classification, phagocytic activity, lysozyme and superoxide dismutase activity, neutralizing antibody titration, immune gene expression analysis, and determination of the relative percent survival in vaccinated gibel carp. The results of blood cell counts indicated that the numbers of the red and white blood cells in the peripheral blood of immunized gibel carp increased significantly at day 4 and day 7 after vaccination (p < 0.01). The differential leukocyte count of neutrophils and monocytes were significantly different compared to the control group at day 4 and 7 and the percentage of lymphocytes reached a peak at day 21. The phagocytic percentage and phagocytic index peaked at day 4 post-vac...Continue Reading
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