Leptospira interrogans serotype pomona infection and leptospiruria in vaccinated pigs

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Abstract
Extract Abortions, stillbirths, and high neonatal mortality are the clinical features and reasons for the economic importance of Leptospira serotype pomona infection in pigs. In most cases, however, obvious clinical signs are not observed (Huhn, 1972 Huhn, R. G. 1972. Current status of leptospiral immunizing agents for use in swine. Am. J. vet. Res., 160: 634–637. [Google Scholar] ). There is a large volume of evidence that commercial anti-leptospiral vaccines are generally successful in preventing clinical signs of disease. evidence also exists that some vaccines may, in addition, prevent renal infection and leptospiruria (Stalheim, 1968a Stalheim, O. H. V. 1968a. Vaccination against leptospirosis: immunogenicity of viable avirulent Leptospira pomona in hamsters, swine, and cattle. Am. J. vet. Res., 29: 473–478. [Google Scholar] , b Johnson, R. C. and Harris, V. G. 1967. Differentiation of pathogenic and saprophytic leptospires. I. Growth at low temperatures. J. Bact., 94: 27–31. [PubMed], [Web of Science ®] [Google Scholar] ). In New Zealand vaccines are widely used in pigs for preventing losses associated with pomona infection, but there is little published information concerning their efficacy in preventing infection and leptospiruria.

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