A conserved 37 kDa outer membrane protein of Edwardsiella tarda is an effective vaccine candidate.
An effective vaccine against Edwardsiella tarda has not been reported, one of main reasons is the variation in its serotypes. This study aimed to develop an effective vaccine against different serotypes of E. tarda. A conserved 37-kDa outer membrane protein (OMP) of E. tarda was obtained by SDS-PAGE. Several proteins were detected by two-dimensional (2D) PAGE analysis, and a high similarity to glyceraldehyde-3-phosphate dehydrogenase was determined by N-terminal amino acid sequence analysis. Japanese flounder (Paralichthys olivaceus) vaccinated with the 37-kDa OMP was significantly protected against the infection by different serotypes of E. tarda. A specific antibody was also detected by using ELISA. This study suggests that the 37-kDa OMP is an effective potent vaccine candidate against different serotypes of E. tarda.