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. 1987 Nov;25(11):2094–2097. doi: 10.1128/jcm.25.11.2094-2097.1987

Genetic and antigenic differences of serologically indistinguishable leptospires of serovar hardjo.

R B LeFebvre 1, A B Thiermann 1, J Foley 1
PMCID: PMC269418  PMID: 2447118

Abstract

Pathogenic leptospires of serovar hardjo isolated from North American cattle were compared genetically and antigenically to reference strain hardjoprajitno of the Sejroe serogroup. Guanine-plus-cytosine (G+C) contents were determined for the genomes, and microscopic agglutination, Western blotting (immunoblotting), and immunoprecipitation were used to characterize antigenic relatedness. Major differences were demonstrated between the isolates and the reference strain. The G+C content of the reference strain was calculated to be approximately 34 +/- 1%, and those of the isolates were calculated at 39 +/- 1%. Antigenic differences between the isolates and the reference strain were identified by using rabbit immune serum raised against a hardjo isolate exhaustively adsorbed with hardjoprajitno whole and sonicated cells. Western blot analysis and immunoprecipitation using this adsorbed serum revealed antigens apparently unique for the hardjo isolates. Microscopic agglutination with the adsorbed rabbit serum did not agglutinate hardjoprajitno when diluted 1:2 but agglutinated bovine isolates to a 1:32 dilution. Bovine antiserum raised against the isolates was also used to identify antigens by immunoprecipitation.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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