Acute Herpes Simplex Viral Esophagitis Occurring in 5 Immunocompetent Individuals With Eosinophilic Esophagitis.

Herpes simplex esophagitis (HSE) is an acute, severe viral infection of the esophagus, rarely occurring in immunocompetent individuals. Eosinophilic esophagitis (EoE) is a rare immune-mediated esophageal disorder. We recently observed 5 severe HSE cases in diagnosed EoE patients. Four of the 5 patients had active, untreated EoE at the time of infection, so HSE is not likely a side effect of swallowed topical corticosteroids, the first-line medical treatment of EoE. However, this coincidence of these 2 rare conditions raises the question of a causal relationship between these 2 forms of esophagitis, and whether active EoE might predispose to HSE infection.