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Cross-protection elicited in channel catfish (Ictalurus punctatus Rafinesque) immunized with a low dose of virulent Edwardsiella ictaluri strains

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Cross-protection of channel catfish (Ictalurus punctatus Rafinesque) immunized with a low dose of virulent Edwardsiella ictaluri and challenged with six E. ictaluri strains was examined in four trials. The relative per cent survival among low-dose immunized and then challenged fish ranged from 27.7% to 100%. Significant protection (P<0.05), with the exception of strain ATCC-33202, was conferred by immunization with a given E. ictaluri strain challenged either with a homologous or a heterologous strain. Antibody titres of pooled serum collected on day 22 from surviving fish examined by enzyme-linked immunosorbent assay (ELISA) ranged from 1:40 to 1:320, but no differences were apparent among different vaccinated groups. The protein profiles of six E. ictaluri strains examined by Sodium dodecyl sulphate-polyacrylamide gel electrophoresis (SDS-PAGE) showed a relatively homogeneous pattern. Immuno-blots probed with pooled serum from immunized and challenged fish showed a pattern similar to LPS-reaction patterns observed with E. ictaluri in other studies. Since the present studies further corroborate that E. ictaluri is a clonal bacterial species with no apparent antigenic differences, it is possible that immunization with a single E. ictaluri field strain should confer protection against any other strain.
Panangala, Victor S. , Shoemaker, Craig A. , Klesius, Phillip H. , Mitra, Amitava , Russo, Riccardo
Ictalurus punctatus , catfish , freshwater fish , immunization , immune response , disease prevention , fish diseases , bacteremia , Edwardsiella ictaluri , animal pathogenic bacteria , fish culture
p. 915-926.
Includes references
Aquaculture research 2009 May, v. 40, no. 8
Oxford, UK : Blackwell Publishing Ltd
Journal Articles, USDA Authors, Peer-Reviewed
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