Tetracycline/BSA is an antigen-adjuvant conjugate combining Tetracycline with bovine serum albumin (BSA). This conjugation enhances the production of antigen-specific antibodies in vaccine models by attaching the antigen to the protein adjuvant. The conjugate does not disrupt protein folding or alter primary epitopes, and it facilitates improved cross-presentation and generation of antigen-specific T cells.