ABSTRACT: A protective immune response in infectious salmon anaemia (ISA)-infected Atlantic salmon Salmo salar L. was demonstrated. Atlantic salmon that had survived an ISA infection 75 d previously were less susceptible to reinfection. Fish passively immunized with serum from fish that had recovered from ISA were found to be partly protected against ISA. Neutralizing activity of ISA-convalescent antiserum was demonstrated by mixing convalescent antiserum with ISA-infective tissue homogenate and injecting this preparation into Atlantic salmon.

KEY WORDS: Infectious salmon anaemia . Atlantic salmon . Immune response . Neutralizing antibody . Passive immunity

Published in DAO Vol. 21, No. 1 (1995) on February 2
ISSN: 0177-5103. Copyright © Inter-Research, Oldendorf/Luhe, 1995