Immunisation against pneumococcal disease caused by those pneumococcal types included in the vaccine. Immunocompetent individuals ≥2 yr: Person w/ chronic CV disease, chronic pulmonary disease or DM, alcoholism, chronic liver disease or CSF leaks, functional or anatomical asplenia; person living in special environments or social settings; routine vaccination for person ≥50 yr. Immunocompromised individuals ≥2 yr including those w/ HIV infection, leukemia, lymphoma, Hodgkin's disease, multiple myeloma, generalized malignancy, chronic renal failure or nephrotic syndrome; those receiving immunosuppressive chemotherapy & have received an organ or bone marrow transplant. Revaccination in person ≥2 yr at high risk of serious pneumococcal infection & those likely to have a rapid decline in pneumococcal Ab levels after at least 5 yr of 1st dose of pneumococcal vaccine.