- Patients who are human immunodeficiency virus (HIV) positive but have no prior acquired immune deficiency syndrome (AIDS)-defining illness and have cluster of differentiation (CD)4 cells of at least 350/mm^3 are eligible; HIV-positive patients must not have multi-drug resistant HIV infection or other concurrent AIDS-defining conditions; patients must not be seropositive for hepatitis B (hepatitis B surface antigen positive or anti-hepatitis B core antigen positive) or seropositive for hepatitis C (anti-hepatitis C antibody positive); however, patients who are immune to hepatitis B (anti-hepatitis B surface antibody positive) are eligible (e.g. patients immunized against hepatitis B)