A 37 year old newly married man presents with multiple blister-like lesions on the glans of his penis, appearing over the past 2 days. On questioning, he recalls similar episodes over the past 2 years. Examination is remarkable for tender, 3-4 mm vesicular lesions on the shaft of his penis with no apparent crusting, drainage, or bleeding. There is also slight bilateral inguinal adenopathy. During the asymptomatic period between outbreaks, where would the causative agent likely have been found?
A 37 year old newly married man presents with multiple blister-like lesions on the glans of his penis, appearing over the past 2 days. On questioning, he recalls similar episodes over the past 2 years. Examination is remarkable for tender, 3-4 mm vesicular lesions on the shaft of his penis with no apparent crusting, drainage, or bleeding. There is also slight bilateral inguinal adenopathy. During the asymptomatic period between outbreaks, where would the causative agent likely have been found?
💡 Explanation
**Core Concept**
The question is testing the knowledge of the dormant phase of a viral infection, specifically the location of the causative agent between outbreaks. The correct answer requires an understanding of the pathophysiology of herpes simplex virus (HSV) infection.
**Why the Correct Answer is Right**
HSV-2, the causative agent of genital herpes, remains dormant in the sacral ganglia during the asymptomatic period between outbreaks. The virus can reactivate from this latent state, resulting in recurrent lesions. The sacral ganglia, specifically the geniculate ganglion, serve as the site of latency for HSV-2.
**Why Each Wrong Option is Incorrect**
**Option A:** The rectum and other mucosal surfaces can be involved in HSV-2 infection, but they are not the primary site of latency.
**Option B:** The skin is the site of primary infection and initial replication of HSV-2, but it is not the site of latency.
**Option C:** The central nervous system (CNS) can be involved in HSV-2 infection, particularly in immunocompromised individuals, but it is not the primary site of latency.
**Clinical Pearl / High-Yield Fact**
HSV-2 can be transmitted through skin-to-skin contact with an infected partner, even when they are asymptomatic.
**Correct Answer: C. The sacral ganglia.**
✓ Correct Answer: D. Neurons of the sacral ganglia
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