Role of viruses in systemic lupus erythematosus and Sjogren syndrome

Systemic lupus erythematosus and Sjogren syndrome remain elusive in the description of their underlying etiologic causes and pathogenic mechanisms. Although underlying genetic predisposition appears to contribute to both diseases based on twin and other genetic studies, additional factors must play a role. Over the decades additional factors, such as hormonal influence, UV light, environmental exposures (eg, silica, solvents), and infectious agents have been postulated to play a role. Over the past few years additional information has been published concerning roles of various infectious agents in both lupus and Sjogren syndrome. Although the understanding of this field is still incomplete, significant advances are being made.(C) 2001 Lippincott Williams & Wilkins, Inc.