Vaccine Development – Lessons Learned and Future Trends brings together updated reviews and research contributions from international experts on modern vaccine development, production, distribution, and use. The volume examines lessons from past and recent infectious disease challenges while highlighting current advances and emerging directions. Chapters cover viral dynamics and vaccine efficacy; country-specific vaccination experiences; vaccine design and technology; biofilm-, plant-, oral-, and mRNA-based vaccine platforms; and post-COVID-19 issues, including autoimmunity, vascular dysfunction, and metabolic alterations. The book also addresses rational vaccine thinking, delivery in fragile settings, field constraints, and product requirements. It is intended for researchers, students, clinicians, biotechnology professionals, public health specialists, and policymakers interested in the future of vaccines.