Abstract
The protective effect of dialyzable leukocyte extract (DLE) was investigated in the experimental model of Salmonella infection in calves. DLE was obtained from the lymphatic nodes and spleens of fattening bulls immunized with whole-cell Salmonella vaccine (designated DLE s-im), from the same organs of calves immunized and subsequently infected with Salmonella typhimurium (DLE s-inf), and from non-immunized fattening bulls (DLE n). Three doses of DLE s-inf and DLE s-im applied intravenously at 3-day intervals induced protection in all calves against infection. There were statistically significant differences in the immunological, clinical and microbiological parameters. Three doses of DLE s-inf injected intramuscularly at 3-day intervals provided a protective effect; however, one calf died. The intravenous application of DLE n induced low protection against experimental Salmonella infection and two calves died. The results indicate that the preparation of antigen-specific DLE may be possible via immunization of fattening bulls.
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