This study was conducted to select the media for the formalin killed vaccine (FKC) production of Vibrio harveyi and its application for olive flounder, Paralichthys olivaceus. For this, we have investigated the immune effects of Vibrio harveyi FKC vaccines grown in 3 different media i.e. Tryptic Soy Broth (TSB), TSB containing 2-2'-dipyridyl (TSB-D), Brain Heart Infusion Broth (BHIB) on the production of agglutinating antibody and protection against Vibrio harveyi in olive flounder. Additionally, a dual vaccine was prepared by combining Streptococcus parauberis vaccine to V. harveyi vaccine and its efficacy was also analyzed with the determination of optimal administration dosage. Consequently, olive flounder immunized with FKC grown in TSB-D showed the same protection with the vaccine grown in BHIB and the optimal dose of the vaccine was 10mg/kg of body weight. Indeed the dual vaccine showed higher agglutination titer and protection than control fish. The optimal dose for dual vaccine was 10mg/kg body weight for each of two vaccines.
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