Abstract: Polyclonal Antibodies produced using HIV-1 Trimeric Envelope Glycoprotein Subunits (TEGS) are provided. TEGS are comprised of non-infectious complexes comprising a trimeric envelope glycoprotein subunit comprising gp120 bound to membrane-anchored trimeric native gp41. The gp120 and gp41 present in the TEGS are not chemically fixed or cross-linked. Immunization with the TEGS elicits polyclonal antibodies that neutralize diverse viruses in HIV infection assay using peripheral blood mononuclear cells (PBMCs). The present invention relates to a method for reducing the occurrence and/or severity of HIV infections.