It is truly amazing to reflect on the advances in vaccinology for adults over the past 35 years. As recently as April 1991, we had a robust armamentarium of childhood vaccines, but the Advisory Committee on Immunization Practices (ACIP) adult vaccine schedule only included 4 vaccines (tetanus-diphtheria toxoids [Td], measles-mumps-rubella, influenza, and pneumococcal polysaccharide vaccine (PPSV23; Pneumovax23, Merck)1 (Table 1). The number of
DECEMBER 15, 2023