After studying a bisexual male with a clinical picture suggestive of AIDS a positive ELISA test for antibodies against the Human Immunodeficiency Virus (HIV), but negative results on indirect immunofluorescence testing, as well, as absence of core and envelope HIV antibodies by ELISA, and who later turned out to have Systemic Lupus Erythematosus (SLE) which become asymptomatic on corticosteroid therapy, we decided to test 70 patients with SLE for HIV antibodies. Four of them (5.6%) were positive by ELISA, but on a repeated test only 2 (2.8%) remained positive, and their sera was tested by indirect immunofluorescence. They were negative, as was the ELISA test for core and envelope HIV antibodies. We conclude that the possibility of more such cases, of SLE mimicking AIDS, should be kept in mind, including the occurrence of false positive ELISA tests in such patients.