The frequency of getting a pneumonia vaccine depends on age and health status:

• For infants, a series of 4 doses is given: at 2 months, 4 months, 6 months, and a booster between 12-15 months.
• Adults 65 years or older usually require one or two doses, which often provide lifelong protection.
• Adults aged 2 to 64 with certain health conditions or smokers may need 1 to 3 doses.
• Pneumococcal conjugate vaccines (PCV15, PCV20) are administered in childhood or in adults with specific indications, while the pneumococcal polysaccharide vaccine (PPSV23) may be given once or twice in adulthood.
• The timing between PPSV23 and PCV vaccines typically is about one year, but shorter intervals may be used in special cases.

Most people receive the vaccine once or as a limited series based on their age and risk factors, not regularly like the annual flu shot.