A Phase I Clinical Trial to Evaluate the Safety and Immunogenicity of 100 mcg of Env 2-3 in MF59

Inclusion Criteria Subjects are: * Normal, healthy adults (by history and physical examination) who fully comprehend the purpose and details of the study. Exclusion Criteria Co-existing Condition: Subjects with the following conditions or symptoms are excluded: * Positive syphilis serology (such as VDRL) unless positive test is due to a documented clinical event that occurred and was treated 5 or more years prior to enrollment. * Circulating hepatitis B antigenemia. Subjects with the following prior conditions are excluded: * History of immunodeficiency, chronic illness, or autoimmune disease. * Evidence of depression or under treatment for psychiatric problems during the past year. Prior Medication: Excluded: * Immunosuppressive medications. Prior Treatment: Excluded: * Blood transfusions or cryoprecipitates within the past 6 months. Identifiable high-risk behavior for HIV infection, including: * history of intravenous drug use; syphilis, gonorrhea, or any other sexually transmitted diseases (including chlamydia or pelvic inflammatory disease) in the last 6 months; more than two sexual partners, or sexual contact with a high-risk partner, in the preceding 6 months.