Evaluation of the protective efficacy of inactivated vaccines for preventing streptococcosis in cobia (<i>Rachycentron canadum</i>) cultured in Khanh Hoa

Abstract

    The study was conducted to evaluate the effectiveness of inactivated vaccines against Streptococcus iniae bacteria causing blindness in cobia. The test results showed that inactivated vaccine was completely safe for cobia. (There was no difference in length and weight between experimental and control fish, no abnormalities were observed in intraperitoneal of immunized fish). In challenging trials, the inactivated vaccine effectively protected the cobia from S. iniae with a Relative Survival Rate (RPS) of 85.19% corresponding to the injection dose of 10⁴ CFU / fish. The antibody titre of immunized fish was 19.7 while in control fish it was 0.

DOI: https://doi.org/10.53818/jfst.01.2020.341