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Two year old brown trout Salmo trutta L in a freshwater farm with a history of enzootic Aeromonas salmonicida infections were vacclnated with a commercial vaccine against furunculosis by intrapentoneal injection either with or without a booster Antibody levels to 3 cellular antigen preparations from A salmoniclda, i e whole cells of A salmon~cida, Alaye~ protein, and l~popolysacchailde (LPS) lsolated from the bactenum, were measured using an ELISA technique Ant ibod~es to ivhole cell A salmonicida and LPS were demonstrated in both vaccinated and non-vacc~nated fish Antibodies to A-layer protein were only detected in very low quantities in non-vaccinated f ~ s h In vacclnated f ~ s h , the levels of these antibodies were significantly h ~ g h e r in boosted fish than in fish vaccinated only once Western blot analyses of fish serum also revealed antibodies to LPS and A-layer piotein Antlbody activit~es to extracellular products froin A salmonicida wele malnly against a 70 kDa component and LPS Prior to a challenge test in which furunculosis was induced by increasing the water temperature, all f ~ s h wele bled and lndiv~dually marked Only boosted fish showed s~gnificant protection in this challenge, and no mortalities were recorded In this group The groups ot f ~ s h which had recelved only 1 lmmunlzation were not protected against furunculosis In these g1 oups, pre-challenge antibody levels to cell membrane antigens, as measured by ELlSA d ~ d not differ between survivors and non-survivors This ind~cates that high levels ot spec~fic antibodies to cellular antigens do not correlate with survival of the ind~vidual fish

Humoral antibody response of brown trout Salmo trutta vaccinated against furunculosis