Effect of Vaccination Outer Membrane Protein 52 kDa on Changes in Erythrocyte Index of Tilapia (Oreochromis niloticus) Infected by Aeromonas hydrophila

Abstract

The purpose of this study was to determine the effect after being vaccinated by OMP 52 kDa Aeromonas hydrophila for 1 week and then infected with Aeromonas hydrophila 10 CFU/mL for 4 days on changes in erythrocyte index. Tilapia (Oreochromis niloticus) used in this study was 10-12 cm long. There were 20 tilapia (Oreochromis niloticus) which were divided into 4 groups, consisting of 2 control groups and 2 treatment groups which were given various types of vaccine formulations. Group P0 (-) (unvaccinated and infected), Group P0 (+) (unvaccinated and infected), group P1 (vaccinated with the whole cell protein "HydroVac®" and infected), and P2 (vaccinated with Outer Membrane Protein 52 kDa and infected) by intramuscular injection. Post-treatment blood samples were collected on day 5 post-infection, collected through a caudal punctie and then analyzed using a hematology analyzer. Post-treatment outcomes led to statistically significant changes (p < 0.05). Therefore, the vaccine caused a significant change in the erythrocyte index.