Penicillin G/BSA is an antigen-adjuvant conjugate consisting of Penicillin G linked with bovine serum albumin (BSA). This conjugation enhances the generation of antigen-specific antibodies in vaccine models by linking the antigen with the protein adjuvant. The conjugate does not alter protein folding or disrupt major epitopes, while it enhances cross-presentation and the production of antigen-specific T cells.