Serum antibody response of Indian major carp, Labeo rohita to three species of pathogenic bacteria; Aeromonas hydrophila, Edwardsiella tarda and Pseudomonas fluorescens

• Published in: Veterinary Immunology and Immunopathology 2007-05, Vol.117 (1), p.137-141
• Main Authors: Swain, P., Behura, A., Dash, S., Nayak, S.K.
• Format: Article
• Language: English
• Subjects: Aeromonas hydrophila; Aeromonas hydrophila - immunology; Agglutination Tests - veterinary; Animals; Antibodies, Bacterial - biosynthesis; Antibodies, Bacterial - blood; Antibody response; Carps - immunology; Edwardsiella tarda; Edwardsiella tarda - immunology; Enzyme-Linked Immunosorbent Assay - veterinary; Fish Diseases - immunology; Fish Diseases - microbiology; Fish Diseases - prevention & control; Gram-Negative Bacterial Infections - immunology; Gram-Negative Bacterial Infections - microbiology; Gram-Negative Bacterial Infections - prevention & control; Gram-Negative Bacterial Infections - veterinary; Immunization - methods; Immunization - veterinary; Indian major carps; Labeo rohita; Mixed bacterial antigens; Pseudomonas fluorescens; Pseudomonas fluorescens - immunology; Rohu; Survival Analysis
• ISSN: 0165-2427; 1873-2534; 1365-2567
• DOI: 10.1016/j.vetimm.2007.02.010

The immune response to mixed whole cell antigens of Aeromonas hydrophila, Edwardsiella tarda and Pseudomonas fluorescens, the common Gram negative bacterial pathogens associated with diseases of Indian major carps were evaluated for their efficacy in triggering antibody responses in rohu, Labeo rohita (Ham.). The rohu yearlings were either immunized with antigens from single bacterial strain, A. hydrophila, E. tarda and P. fluorescens or a combination of all three. An antibody response was detected at 1st week post immunization that rose significantly ( p < 0.05) at 4th week post immunization in all the immunized groups. The antibody level started declining after 8th week but persisted up to 10th week post immunization in all the immunized groups. Similarly, no significant difference ( p > 0.05) in the antibody level was found between groups immunized with single and mixed bacterial antigens. Moreover, the use of mixed bacterial antigens did not jeopardize the specific immune response to the vaccine components. Upon challenge with single pathogen, a high relative percent survival was recorded in the group immunized with mixed bacterial antigens and was comparable to those fish immunized with the single bacteria.