Cowdry type A inclusion bodies are characteristic of
**Core Concept**
Cowdry type A inclusion bodies are a type of viral inclusion body seen in the cytoplasm of infected cells, particularly during the early stages of herpes simplex virus (HSV) infection. They are typically small, rounded, and eosinophilic, and are composed of aggregated viral particles.
**Why the Correct Answer is Right**
Cowdry type A inclusion bodies are characteristic of herpes simplex virus (HSV) infection, particularly during the early stages of infection. They are formed when the viral particles aggregate in the cytoplasm of infected cells, leading to the formation of these characteristic inclusion bodies. This aggregation is due to the viral particles' ability to disrupt the normal cellular processes and structure, resulting in the formation of these distinctive inclusions.
**Why Each Wrong Option is Incorrect**
**Option A:** Cowdry type A inclusion bodies are not characteristic of varicella-zoster virus (VZV) infection, which is typically associated with Cowdry type B inclusion bodies.
**Option B:** Cowdry type A inclusion bodies are not seen in cytomegalovirus (CMV) infection, which is characterized by the formation of large, intranuclear inclusion bodies.
**Option C:** Cowdry type A inclusion bodies are not characteristic of enterovirus infection, which is typically associated with the formation of characteristic "owl's eye" inclusion bodies.
**Clinical Pearl / High-Yield Fact**
Cowdry type A inclusion bodies are a classic histopathological finding in herpes simplex virus infection, and are often seen in skin and mucous membrane lesions. They are an important diagnostic feature that can be used to differentiate HSV infection from other viral infections.
**Correct Answer:**
Cowdry type A inclusion bodies.