The frequency of getting the pneumonia (pneumococcal) vaccine depends on age and health status:

• Children under 2 years old: They receive a series of four doses-at 2 months, 4 months, 6 months, and a booster between 12 and 15 months

• Adults 65 years and older: Typically, one to two doses are recommended. If you have never received any pneumococcal conjugate vaccine, you may get PCV15 or PCV20/PCV21. If PCV15 is used, a dose of PPSV23 is given one year later. If PCV20 or PCV21 is used, no additional PPSV23 dose is needed. Usually, these doses provide lifelong protection, so additional doses are not routinely required unless advised by a healthcare provider

• Adults aged 19 to 64 with certain health conditions or risk factors (e.g., immunocompromising conditions, cochlear implants, cerebrospinal fluid leaks, chronic diseases, smoking): They may need one to three doses depending on their specific situation, with minimum intervals between doses (e.g., at least 8 weeks between certain vaccines and 5 years between PPSV23 doses)

• People younger than 65 at higher risk: May require two doses spaced at least 5 years apart

In summary, for most healthy adults over 65, a single dose is sufficient, while those with risk factors may require additional doses spaced over time. Children follow a multi-dose schedule in infancy. Always consult your healthcare provider for personalized recommendations based on your health and vaccination history