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contentuptodate· Content· item f43_26_44448

©2013 UpToDate ® Print Email Time course of antibody development during syphilis A comparison of the reactivity of the VDRL and FTA-ABS during the course of untreated syphilis. A substantial proportion of persons with primary syphilis may not have developed a diagnostic antibody response at the time the chancre of primary syphilis appears. Courtesy of Charles B Hicks, MD; modified from the VD Program, Centers for Disease Control, US Public Health Service.