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  • Title: Natural antibody in mammalian serum reacting with an antigen in some leptospires.
    Author: Faine S, Carter JN.
    Journal: J Bacteriol; 1968 Feb; 95(2):280-5. PubMed ID: 5640374.
    Abstract:
    Serum from normal mammals agglutinated and immobilized nonpathogenic Leptospira biflexa and agglutinated avirulent lines of pathogenic serotypes L. icterohaemorrhagiae and L. zanoni. Virulent lines of L. icterohaemorrhagiae and L. zanoni were not affected, nor were any of three strains of L. pomona, one of which was avirulent. The active principle in serum was a beta-macroglobulin which was heat-labile and reduced by 2-mercaptoethanol, and acted in conjunction with complement and lysozyme; it was absorbable from serum by Formalin-treated susceptible leptospires. The Formalin-stable receptor antigen, named "Z antigen," is associated with virulence rather than pathogenicity, but may not be a determinant of virulence.
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