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Syphilis Explained: Causes, Stages, and Diagnostic Tests

Overview of Syphilis

Syphilis is a sexually transmitted infection caused by the spiral-shaped bacterium Treponema pallidum. It can be visualized using dark-field microscopy after fluorescent staining. Standard treatment is penicillin, and transmission occurs through direct contact or from mother to fetus via the placenta. Understanding the broader context of TORCH Infections: Comprehensive Guide to Congenital Infections in Pregnancy can help contextualize the risks of mother-to-fetus transmission.

Signs and Symptoms

  • Incubation period: 10–90 days (average 3 weeks)
  • Bacteria spread through the bloodstream to all organs

Stages of Syphilis

Primary Syphilis

  • Development of chancre (single lesion) at entry site, often on genitalia
  • Chancre heals after a few weeks

Secondary Syphilis

  • Occurs 2–8 weeks after chancre appearance
  • Symptoms: headache, sore throat, low-grade fever, nasal drainage, skin/mucous membrane lesions, lymphadenopathy
  • Blood tests show moderate leukocytosis with lymphocytosis
  • Relapses may occur; patients remain infectious

Latent / Tertiary Syphilis

  • Non-infectious; diagnosis via serological methods
  • 2–4 years post-infection: relapses possible
  • After 3–10 years: ~1/3 develop tertiary syphilis with skeletal, cardiovascular, and CNS lesions
  • Congenital syphilis: transmission across placenta

Diagnostic Methods

Non-Treponemal Tests (Reagin Antibody)

  • VDRL (Venereal Disease Research Laboratory)
    • Flocculation test on spinal fluid
  • RPR (Rapid Plasma Reagin)
    • Most widely used screening test; flocculation test on serum

Treponemal Tests (Specific for T. pallidum)

  • FTA-ABS (Fluorescent Treponemal Antibody Test)
    • Confirmation test after positive RPR/VDRL
    • Uses fluorescent-tagged antibodies on a slide
    • "ABS" suffix indicates absorption step to remove non-specific antibodies

For a deeper dive into the bacterial pathogen causing syphilis, see Understanding the Differences Between Gram Positive and Gram Negative Bacteria. Unlike many bacteria, Treponema pallidum is a spirochete and does not stain well with Gram stain, which is why dark-field microscopy is essential.

Historical Figures Linked to Syphilis

  • Christopher Columbus: believed to have spread syphilis and died from it
  • George Washington: alleged (no evidence)
  • Napoleon Bonaparte: suffered from syphilis; possibly died from arsenic treatment
  • Franz Schubert: battled syphilis from 1822; died from mercury treatment side effects

Note: Historical arsenic and mercury treatments were toxic and could be fatal.

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