Abstract
The purpose of this study was to evaluate the safety and efficacy of a diaminopimelic acid mutant of Salmonella typhimurium as a vaccine for calves. Transposon techniques were used to create a stable nonreverting diaminopimelic acid mutant of a virulent S. typhimurium strain. Calves were vaccinated at weekly intervals with the diaminopimelic acid mutant given as an oral dose of 10(10) organisms, followed by two subcutaneous doses of 10(9) organisms. The calves tolerated vaccination well and the vaccine strain was eliminated from the feces within four days. Of five vaccinated calves, three survived challenge with 5 X 10(9) organisms of the parent strain whereas all five unvaccinated calves that were challenged died. The surviving calves eliminated the challenge organism from the feces within three weeks.
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Selected References
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