Molecular detection of Treponema pallidum in secondary and tertiary syphilis

Abstract excerpt

Treponema pallidum can be detected by conventional techniques such as dark-field microscopy, immunofluorescence or the rabbit infectivity test, in large numbers in the skin lesions of primary and early secondary syphilis. In the skin lesions of late secondary and tertiary syphilis, conventional techniques fail to detect spirochaetes in general, perhaps due to increasing degeneration and the disappearance of...

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