The frequency of getting the pneumonia vaccine depends on age and health status. For infants under 2 years old, a series of four doses is recommended at 2 months, 4 months, 6 months, and a booster between 12 and 15 months. Adults aged 65 and older typically need one or two doses that provide long- lasting protection for life. For people between 2 and 64 years old, vaccination frequency varies, with one to three doses recommended if they have certain health conditions or risk factors like smoking. Adults generally receive one or two shots, and if both conjugate and polysaccharide types are needed, they are given at separate visits with intervals of 8 weeks to 1 year depending on the schedule. Most people only need the vaccine once, but some with health risks may require more doses or boosters. For example, the CDC recommends a four-dose conjugate vaccine series for children and one or two doses for older adults, potentially spaced by a year. The vaccine protects against pneumococcal bacteria that cause pneumonia and serious infections.