Systems-Integrated Thermostable Vaccine Delivery: Converging Cold-Chain-Free Design, AI-Augmented Formulation, and...

Thermostable vaccine delivery represents a transformative step toward equitable and climate-resilient immunization systems. Unlike conventional vaccines requiring strict cold-chain storage at 2-8 °C, thermostable formulations retain efficacy at elevated ambient temperatures (up to 40-45 °C), enabling deployment in low-resource, remote, and climate-vulnerable regions. Recent advances in excipients, nanoencapsulation, stabilization matrices such as polymers, metal-organic frameworks (MOFs), liposomes, and drying techniques like lyophilization and spray drying have significantly enhanced heat tolerance and shelf life stability. Existing reviews primarily emphasize material innovations and biophysical stabilization strategies, often highlighting case studies and high-throughput screening approaches. However, critical gaps remain regarding systems-level integration of thermostable vaccine platforms. Few studies explore the convergence of digital formulation design, AI-driven development pipelines, geospatial modeling, lifecycle engineering, and carbon-neutral delivery strategies. Similarly, the integration of smart logistics, real-time monitoring, blockchain-based vaccine authentication, and the policy-technology interface required for deployment in conflict zones, postdisaster areas, and regions severely affected by climate change remains underrepresented. Addressing these gaps is essential to move beyond cold-chain elimination toward climate-smart and sustainable vaccine systems capable of meeting the health needs of underserved populations and addressing emerging global immunization challenges.