Rifampin-KLH is a hapten–carrier protein conjugate formed by covalently linking Rifampin to keyhole limpet hemocyanin (KLH), where Rifampin functions as a hapten that is incapable of independently eliciting an immune response and therefore requires conjugation to a high-molecular-weight carrier protein to achieve full immunogenicity, Rifampin-KLH it suitable for antibody production, immunoassay development, and immunological research applications.