Clinical effectiveness of 23-valent pneumococcal polysaccharide vaccine against pneumonia in patients with chronic pulmonary diseases: a matched case-control study.

摘要

The effectiveness of the PPV-23 in preventing pneumonia among patients with chronic pulmonary disease is uncertain. Our results point to PPV-23 having little or null effect against pneumococcal pneumonia in such patients, but definitive conclusions cannot be established based on our data.