Oral Hairy Leukoplakia is most commonly caused by which virus?

Oral Hairy Leukoplakia is most commonly caused by which virus?

• A. Epstein-Barr virus (HHV-4)
• B. Herpes simplex virus type 1
• C. Cytomegalovirus
• D. Varicella-zoster virus

Answer: (A)

This question hinges on recognizing that oral hairy leukoplakia is linked to Epstein-Barr virus infection, especially in people with weakened immune systems such as those with HIV. The lesions are white, corrugated, and firmly adherent to the tongue—characteristics that help distinguish them from other oral conditions like candidiasis, which can often be scraped off. Epstein-Barr virus, a herpesvirus (HHV-4), establishes latent infection in B cells and can reactivate in immunocompromised states, leading to these distinctive oral plaques. The other viruses listed don’t typically cause this lesion. Herpes simplex virus type 1 usually produces painful vesicular ulcers rather than the chronic, hairy-appearing white plaques. Cytomegalovirus and varicella-zoster virus cause different mucosal or systemic disease patterns in immunosuppressed individuals.

This question hinges on recognizing that oral hairy leukoplakia is linked to Epstein-Barr virus infection, especially in people with weakened immune systems such as those with HIV. The lesions are white, corrugated, and firmly adherent to the tongue—characteristics that help distinguish them from other oral conditions like candidiasis, which can often be scraped off. Epstein-Barr virus, a herpesvirus (HHV-4), establishes latent infection in B cells and can reactivate in immunocompromised states, leading to these distinctive oral plaques.

The other viruses listed don’t typically cause this lesion. Herpes simplex virus type 1 usually produces painful vesicular ulcers rather than the chronic, hairy-appearing white plaques. Cytomegalovirus and varicella-zoster virus cause different mucosal or systemic disease patterns in immunosuppressed individuals.