Sarcoidosis and Crohn disease are chronic granulomatous conditions of unknown pathogenesis that affect multiple organ systems. A common mechanism has been proposed but never proved. Recently, it has been suggested that human herpesvirus 8 (HHV-8) might play a role in the pathogenesis of sarcoidosis based on polymerase chain reaction studies showing HHV-8 in a high proportion of affected tissues.1 We used polymerase chain reaction studies to amplify a 233–base pair fragment of HHV-8 DNA in archived specimens of tissues from patients with sarcoidosis and Crohn disease who had never been treated with corticosteroids or immunomodulator agents to determine if HHV-8 might be present in these tissues.
Knoell KA, Hendrix JD, Stoler MH, Patterson JW, Montes CM. Absence of Human Herpesvirus 8 in Sarcoidosis and Crohn Disease Granulomas. Arch Dermatol. 2005;141(7):909-910. doi:10.1001/archderm.141.7.909-b