Antibody responses correlate with antigen dose and in vivo protection for oil-adjuvanted, experimental furunculosis (Aeromonas salmonicida subsp. salmonicida) vaccines in Atlantic salmon (Salmo salar L.) and can be used for batch potency testing of vaccin

► Antibody response correlates close with antigen dose for A. salmonicida vaccines. ► There is a correlation between antibody response and protection against challenge. ► The ELISA method identified sub-potent vaccines better than challenge assays.