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  • Title: DNA hybridization with hardjobovis-specific recombinant probes as a method for type discrimination of Leptospira interrogans serovar hardjo.
    Author: Van Eys GJ, Zaal J, Schoone GJ, Terpstra WJ.
    Journal: J Gen Microbiol; 1988 Mar; 134(3):567-74. PubMed ID: 3183617.
    Abstract:
    Restriction endonuclease analysis of DNA of Leptospira interrogans, serovar hardjo, showed two distinct types within this serovar. These two types, hardjoprajitno and hardjobovis, cannot be differentiated by monoclonal antibodies. Application of 32P- or biotin-labelled total DNA probes in dot-blot or in situ hybridization assays showed a high sensitivity of the assays but also considerable cross-hybridization. Therefore, a genomic library of hardjobovis was constructed and a number of hardjobovis-specific recombinant clones were isolated. Finally, four clones were selected on the basis of a strong hybridization signal and a high specificity for hardjobovis as compared to hardjoprajitno. In a dot-blot assay as well as in in situ hybridization experiments all four clones gave strong signals, and no cross-hybridization with hardjoprajitno was observed in either type of assay. Our results indicate that specific recombinant DNA probes might provide tools for routine diagnosis and classification in cases of hardjo infections.
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