Subunit vaccine delivery systems have emerged as groundbreaking strategies to enhance immunogenicity and efficacy, overcoming the limitations of traditional vaccine approaches. This review article delves into the vast landscape of subunit vaccine delivery systems, encompassing diverse platforms, such as polymer-based, lipid-based, micelle-based, phage-based, hydrogel-based, inorganic-based, and emulsion-based carriers. This review aimed to comprehensively explore the advancements, challenges, and potential of these delivery systems in revolutionizing vaccine development. Key findings revealed that polymer-based systems offer tunable properties for sustained release, while lipid-based and micelle-based carriers enable efficient encapsulation of hydrophobic antigens. Phage-based platforms leverage host–pathogen interactions, whereas hydrogel-based carriers provide localized delivery and adjuvant effects. Inorganic nanoparticles and emulsions offer targeted delivery and improved immune responses. These findings offer opportunities to enhance the immunogenicity of subunit vaccines, optimize antigen delivery, and tailor responses to specific diseases. This review can guide researchers, clinicians, and policymakers in harnessing the strengths of diverse delivery systems to improve vaccination strategies. By shedding light on their design, applications, and impacts, this review serves as a roadmap for the development of next-generation vaccines with the potential to transform global health-care paradigms.
Key words: adjuvants, immune response, infectious diseases, subunit vaccines, vaccine delivery systems
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