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

A 25-year-old male presents with painful urination and a thick, yellowish-green urethral discharge. Microscopic examination of the exudate reveals intracellular Gram-negative diplococci. The most likely causative agent is:

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

📝 Explanation

The correct option is Neisseria gonorrhoeae. The clinical presentation of purulent discharge and dysuria, combined with the microscopic finding of intracellular Gram-negative diplococci (coffee-bean shape), is the classic diagnostic hallmark of gonorrhea. Treponema is a spirochete, while HSV and HIV are viruses.

📖 Additional Information

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

The correct option is Neisseria gonorrhoeae. The clinical presentation of purulent discharge and dysuria, combined with the microscopic finding of intracellular Gram-negative diplococci (coffee-bean shape), is the classic diagnostic hallmark of gonorrhea. Treponema is a spirochete, while HSV and HIV are viruses.

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