Protection against vibriosis and furunculosis by the use of attenuated strains of Vibrio anguillarum.

• The fish pathogen Vibrio anguillarum causes a lethal infectionin rainbow trout (Salmo gairdneri). Three different avirulentmutants, constructed by transposon insertion mutagenesis (VAN20and VAN70) or as antibiotic-resistant mutants (VAN1000), wereisolated by screening 200 individual isolated mutants for avirulence.When used as live vaccines, all three avirulent mutants wereable to induce protective immunity against the homologous aswell as a heterologous strain of V. anguillarum. When VAN1000was used, protective immunity could be recorded 1 week afterbath vaccination with 10(7) bacteria per ml of water for 30min. A single-dose immunization was effective for at least 12weeks. Western immunoblotting showed that strains of V. anguillarumhave antigenic determinants in common with Aeromonas strains.Therefore, we tested and confirmed that VAN1000 also was ableto induce protective immunity against challenge with Aeromonassalmonicida. 

Ämnesord

NATURVETENSKAP  -- Biologi -- Mikrobiologi (hsv//swe)

NATURAL SCIENCES  -- Biological Sciences -- Microbiology (hsv//eng)

Nyckelord

Microbiology

Mikrobiologi

Mikrobiologi

Microbiology

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