Vaccine candidates and mAbs are categorized into three different target populations: (1) pediatric, (2) maternal, and (3) older adults and clinical phase of development: Phase I, II, or III. Different immunization approaches are indicated by the legend at the bottom. The route of administration is indicated in the small purple circles at the right: (1) intramuscular (IM), (2) intranasal (IN), (3) intradermal.