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The 39-kilodalton protein (P39) has previously been shown to be an immunodominant protein inBrucella infections. P39 gene deletion mutants of vaccine strainsBrucella abortus S19 andBrucella melitensis Rev.1 were constructed by gene replacement. This deletion did not significantly modify the residual virulence of both vaccine strains in CD-1 mice. CD-1 mice vaccinated with the parent or mutant strains were protected against a virulent challenge. Mutant vaccine strains devoid of P39 could provide a means for differentiating vaccinated from infected animals.

Effect of P39 Gene Deletion in Live Brucella Vaccine Strains on Residual Virulence and Protective Activity in Mice