title: Spontaneous reversion of FTA-ABS test reactions.
abstract: In a series of 56 clinically healthy persons with no history of syphilis and negative VDRL tests but reactive fluorescent treponemal antibody absorption (FTA-ABS) tests, 20 spontaneously developed nonreactive FTA-ABS tests in a period of eight months or less. All but one of these had been of 2+ or less fluorescence. In such a situation, the serologic tests for syphilis (VDRL and FTA-ABS tests) should be repeated at intervals for up to a year before coming to a decision regarding the diagnosis of syphilis. Laboratories could facilitate that decision by reporting degrees of fluorescence of the FTA-ABS test.
mesh_terms: D000042:Absorption; D000293:Adolescent; D000328:Adult; D005189:False Positive Reactions; D005260:Female; D005428:Flocculation Tests; D005455:Fluorescent Antibody Technique; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D013588:Syphilis Serodiagnosis; D013997:Time Factors; D014210:Treponema pallidum / Q000276:immunology