A 26-year-old man comes to the office due to a 3-day-history of dysuria and urethral discharge. The symptoms developed about 2 weeks after he had unprotected sexual intercourse with a new partner. His temperature is 37.1 C (98.8 F). On physical examination, a mucoid discharge is expressed with gentle milking of the penis. Gram stain of the discharge reveals numerous neutrophils with intracellular diplococci. A sample of the discharge is placed on an antibiotic-containing medium, and bacterial colonies are cultured. Which of the following terms best describes the medium?

Question

A 26-year-old man comes to the office due to a 3-day-history of dysuria and urethral discharge.  The symptoms developed about 2 weeks after he had unprotected sexual intercourse with a new partner.  His temperature is 37.1 C (98.8 F).  On physical examination, a mucoid discharge is expressed with gentle milking of the penis.  Gram stain of the discharge reveals numerous neutrophils with intracellular diplococci.  A sample of the discharge is placed on an antibiotic-containing medium, and bacterial colonies are cultured.  Which of the following terms best describes the medium?

Quizplus · Accepted Answer

Eductional Objective: Neisseria can be isolated by culture on selective media such as the Thayer-Martin VCN (vancomycin/colistin/nystatin) medium, which inhibits growth of contaminants such as gram-positive organisms, gram-negative organisms other than Neisseria, and fungi.

A 26-Year-Old Man Comes to the Office Due to a 3-Day-History