Abstract
In a previous communication Kolmer, Bondi, Howard and Rule' reported that rabbits given subcutaneous injections of a heat-killed vaccine of Br. abortus developed agglutinin, bacteriotropin and protective antibody in their serums which passively immunized a large percentage of mice against fatal infections following intra-abdominal inoculation with virulent strains of Br. abortus and Br. melitensis. Also that rabbits im-
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