An HIV patient complains of visual disturbances. Fundal examination shows bilateral retinal exudates and perivascular haemorrhges. Which of the following viruses are most likely to be responsible for this retinitis –
## **Core Concept**
The question tests knowledge of **opportunistic infections** in HIV patients, specifically those causing **retinitis**. HIV patients are susceptible to various opportunistic infections due to their compromised immune system. Certain viruses can cause severe ocular complications in these patients.
## **Why the Correct Answer is Right**
The clinical presentation of **bilateral retinal exudates and perivascular hemorrhages** in an HIV patient is highly suggestive of **cytomegalovirus (CMV) retinitis**. CMV retinitis is a common opportunistic infection in HIV/AIDS patients, especially those with a CD4 count below 100 cells/μL. It characteristically presents with **retinal exudates (often described as "pizza pie" or "cheese and ketchup" appearance) and perivascular hemorrhages**. CMV retinitis can lead to severe visual impairment if not promptly treated.
## **Why Each Wrong Option is Incorrect**
- **Option A:** While **Varicella-Zoster Virus (VZV)** can cause ocular complications, such as herpes zoster ophthalmicus, it typically presents with a dermatomal rash and does not characteristically cause bilateral retinal exudates and perivascular hemorrhages in HIV patients.
- **Option B:** **Herpes Simplex Virus (HSV)** can cause ocular infections, including keratitis and retinitis, but it is less commonly associated with the specific presentation of bilateral retinal exudates and perivascular hemorrhages compared to CMV.
- **Option D:** **Epstein-Barr Virus (EBV)** is associated with various conditions, including infectious mononucleosis and certain malignancies, but it is not typically linked to the ocular findings described.
## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that **CMV retinitis is a sight-threatening condition** that requires prompt diagnosis and treatment in HIV patients. Early recognition and initiation of **antiviral therapy** (such as ganciclovir) can help preserve vision and prevent progression.
## **Correct Answer:** .