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Protection of cattle against natural challenge with Leptospira interrogans serovar hardjo using a hardjo-pomona vaccine

, : Protection of cattle against natural challenge with Leptospira interrogans serovar hardjo using a hardjo-pomona vaccine. New Zealand Veterinary Journal 27(6): 114-116

The Hardjo component of a bivalent hardjo/pomona vaccine prepared from cultures grown in a protein-free medium was tested in calves which experienced a natural challenge about 7 months after vaccination. A significant degree of protection was obtained using either seroconversion or positive urine cultures as indicators of infection. Seroconversion occurred in 10/10 unvaccinated and 2/9 vaccinated calves.


PMID: 292918

DOI: 10.1080/00480169.1979.34620

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