Features that may be shared with SLE:
(1) elevated ANA
(2) one or more clinical findings (skin rash, arthritis, proteinuria, etc)
Infections:
(1) parvovirus B19
(2) CMV
(3) EBV
(4) HIV
(5) leprosy
(6) Kikuchi-Fujimoto Disease
(7) endocarditis
(8) viral hepatitis
(9) visceral leishmaniasis
(10) Whipple's disease
(11) Lyme disease
Drugs
(1) hydralazine
(2) procainamide
Benign or malignant neoplasms:
(1) angioimmunoblastic T-cell lymphoma
(2) Castleman's disease
(3) Hodgkin's disease
(4) Meig's syndrome
(5) atrial myxoma
(6) thymoma
(7) paraneoplastic reactions to lung, breast or other solid tumors
Other autoimmune disorders:
(1) Evans' syndrome
(2) interferonopathy
(3) prolidase deficiency
(4) dermatomyositis
(5) mixed connective tissue disease
(6) Sjogren's syndrome
(7) autoimmune lymphoproliferative syndrome
Other immune disorders:
(1) multiple sclerosis
(2) graft vs host disease
(3) IgG4 disease
(4) Ackerman's syndrome (erythema elevatum diutinum with polyarthritis)
(5) cryoglobulinemia
(6) complement deficiencies
(7) Still's disease
(8) primary immunodeficiencies