The document discusses pneumococcal vaccination recommendations for adults. It provides information on two main pneumococcal vaccines, PCV13 and PPSV23, including their costs, effectiveness against invasive pneumococcal disease (IPD) and non-IPD, and common side effects. It then presents a decision tree outlining recommendations for pneumococcal vaccination in adults based on their age, medical conditions, and vaccination history. The tree provides guidance on determining which vaccines individuals should receive and the timing of doses.