In an HIV patient with vision problems, which pathogen should be considered?

• A. Toxoplasma gondii
• B. CMV
• C. Herpes simplex virus
• D. Syphilis

Answer: (B)

In an HIV patient experiencing vision problems, cytomegalovirus (CMV) should be carefully considered as the likely pathogen. CMV is notorious for causing retinitis in individuals with immunocompromise, particularly in those with advanced HIV or AIDS when the CD4 count is significantly low. The retinitis often presents with symptoms such as floaters, decreased vision, and can lead to permanent vision loss if untreated.

CMV retinitis typically causes characteristic findings on fundoscopic examination, such as retinal hemorrhages and edema, and may appear as fluffy white lesions on the retina. The risk of developing CMV retinitis increases as the immune system weakens, making it a primary concern for eye-related complications in HIV-infected patients.

While other pathogens like Toxoplasma gondii can also cause visual problems through ocular toxoplasmosis, CMV is more commonly associated with direct retinal involvement in the context of severe immunosuppression. Herpes simplex virus may cause keratitis but is less frequently responsible for retinal damage compared to CMV. Syphilis can lead to ocular issues through several mechanisms, but the acute presentation of vision problems in HIV patients is more closely tied to CMV infection. This establishes CMV as the most appropriate choice in this