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Systemic lupus erythematosus (SLE) is a chronic inflammatory disease of the connective tissue, affecting many organs of the body. The cause of SLE remains unknown, but the results of recent immunologic research have enlighted the characteristics of this disease and have contributed to improve the prognosis over the years. The renal and central nervous system involvement, as well as infection, remain high in the list of mortality causes. The usual treatment includes acetylsalicylic acid (ASA), antimalarials and corticosteroids. Main factors known to induce SLE are: sun exposures, pregnancy, therapeutic abortion, infection and several drugs.