**Question:** A 28-year-old HIV-positive male complains of pain on swallowing. Physical examination is remarkable for white plaque-like material on his tongue and buccal mucosa, which is scraped and sent to the laboratory. Based on these findings, and on the laboratory results, the man is diagnosed with acquired immunodeficiency syndrome (AIDS). With which of the following agents is the man most likely infected?

A. Human Immunodeficiency Virus (HIV)
B. Epstein-Barr Virus (EBV)
C. Herpes Simplex Virus (HSV)
D. Cytomegalovirus (CMV)

**Correct Answer:**

**Core Concept:** Human Immunodeficiency Virus (HIV) is the virus responsible for acquired immunodeficiency syndrome (AIDS). HIV primarily targets CD4+ T cells, which are essential for the immune system's function and regulation.

**Why the Correct Answer is Right:**

In this scenario, the patient is diagnosed with AIDS due to the presence of white plaque-like material on the tongue and buccal mucosa, as well as his HIV-positive status. The laboratory results from scraping the lesions would confirm the presence of HIV in the tissue samples, further supporting the diagnosis.

**Why Each Wrong Option is Incorrect:**

A. EBV (Epstein-Barr Virus): Although EBV can cause oral lesions, it is less commonly associated with AIDS and is more commonly linked to infectious mononucleosis or post-transplant lymphoproliferative disorders.

B. HSV (Herpes Simplex Virus): HSV can cause oral lesions, but it is less likely to cause AIDS. HSV is more commonly associated with genital herpes simplex infections.

C. CMV (Cytomegalovirus): CMV infection can cause oral lesions, but it is less likely to lead to AIDS. CMV is more commonly associated with immunocompromised patients, particularly those with AIDS or undergoing organ transplantation.

**Clinical Pearl:**

In cases of oral lesions and AIDS suspicion, it is crucial to consider HIV infection as the primary etiology, as it is the most common cause of oral lesions and AIDS. While other viruses like EBV, HSV, and CMV can also cause oral lesions, they are typically associated with different clinical presentations and are less likely to be the primary cause of AIDS.