Nanotechnology Applications in Vaccine Delivery Systems Abstract Introduction: Vaccine delivery plays a crucial role in achieving effective immune responses.

Traditional vaccine systems sometimes face challenges such as poor stability, limited targeting ability, and reduced immunogenicity. Nanotechnology has emerged as a promising approach to improve vaccine delivery and enhance immunological outcomes. Background: Nanotechnology-based delivery systems such as nanoparticles, liposomes, and nano emulsions provide improved antigen protection, controlled release, and targeted delivery to immune cells. These nanoscale carriers can enhance antigen presentation and stimulate both humoral and cellular immune responses, making them valuable in modern vaccine development. Methods: This study reviews recent scientific literature on nanotechnology-based vaccine delivery systems. Various nanocarriers including polymeric nanoparticles, lipid nanoparticles, and virus-like nanoparticles were analysed for their formulation methods, delivery mechanisms, and immunological effectiveness. Results: Findings indicate that nanotechnology significantly improves vaccine stability, antigen protection, and targeted delivery to antigen-presenting cells. Nanoparticle-based systems also enhance immune activation, reduce required antigen doses, and allow controlled release of vaccine components. Several nano-based vaccines have demonstrated improved efficacy and safety in preclinical and clinical studies. Conclusion: Nanotechnology offers a powerful platform for improving vaccine delivery systems. By enhancing antigen stability, targeting efficiency, and immune response, nano-based delivery systems have the potential to revolutionize future vaccine development and improve global immunization strategies.