What are important considerations in vaccine development and delivery?

— Biology of the pathogen: Virulence and Infectivity, Number of serotypes, potential for mutation, Presence or absence of animal hosts — Characteristics of the vaccine: Stability, safety, reactogenicity, Lasting protective potential: Type of elicited immune response — Logisitics: Production (cost, scale-up…), transport (cold chain), storage, Target population, Trust/hesitancy, field operation (healthcare, campaigns, accessibility