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The causative organism of syphilis is___________?

  • A.Borrelia burgdorferi
  • B.Chlamydia trachomatis
  • C.Leptospira interrogans
  • D.Treponema pallidum

Answer: D

Correct answer: Treponema pallidum

Syphilis is caused by the spirochaete Treponema pallidum subspecies pallidum, a thin regularly coiled organism too slender to be seen on Gram film and demonstrated instead by dark-ground microscopy of a chancre exudate. Borrelia burgdorferi causes Lyme disease, Chlamydia trachomatis causes trachoma and non-gonococcal urethritis, and Leptospira interrogans causes leptospirosis. All four are spirochaetes or intracellular organisms with quite different clinical pictures.

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