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BIO NMDCAT Sexually transmitted diseases
nmdcat.online July 16, 2026

A patient with a history of an untreated sexually transmitted infection presents years later with severe neurological deficits, including a broad-based gait and dementia. The causative agent responsible for this tertiary stage complication is:

A. Herpes simplex virus
B. Neisseria gonorrhoeae
C. Treponema pallidum
✓
D. Human immunodeficiency virus

📝 Explanation

The correct option is Treponema pallidum. Tertiary syphilis can present as neurosyphilis, causing progressive degeneration of the central nervous system (e.g., tabes dorsalis and general paresis/dementia) years or decades after the initial infection.

📖 Additional Information

  • Herpes simplex virus
  • Neisseria gonorrhoeae
  • Treponema pallidum
  • Human immunodeficiency virus

The correct option is Treponema pallidum. Tertiary syphilis can present as neurosyphilis, causing progressive degeneration of the central nervous system (e.g., tabes dorsalis and general paresis/dementia) years or decades after the initial infection.

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