{Reference Type}: Journal Article {Title}: Effectiveness of a 23-valent pneumococcal polysaccharide vaccine for the prevention of pneumococcal pneumonia in the elderly with chronic respiratory diseases: a case-control study of a single center. {Author}: Masuda T;Nakatani E;Shirai T;Akamatsu T;Tamura K;Takahashi S;Tanaka Y;Watanabe H;Endo Y;Suzuki T;Saigusa M;Yamamoto A;Morita S;Sato Y;Asada K; {Journal}: BMC Pulm Med {Volume}: 21 {Issue}: 1 {Year}: Apr 2021 16 {Factor}: 3.32 {DOI}: 10.1186/s12890-021-01491-w {Abstract}: BACKGROUND: The effectiveness of the 23-valent pneumococcal polysaccharide vaccine (PPSV23) in preventing pneumococcal pneumonia has been controversial.
METHODS: To evaluate the effectiveness of the PPSV23 in elderly outpatients with chronic respiratory diseases, we carried out a case-control study, including 4128 outpatients aged ≥ 65 years, in the respiratory department.
RESULTS: There were 320 vaccinated patients, of which 164 were diagnosed with pneumococcal pneumonia. The adjusted odds ratio was 0.39 (95% confidence interval (CI), 0.17 to 0.89). In the subsets consisting of age groups ≥ 70 and ≥ 75 years, the adjusted odds ratio (95% CI) was respectively 0.16 (0.04 to 0.67) and 0.15 (0.02 to 1.12).
CONCLUSIONS: This real-world study suggests that PPSV23 can be useful in preventing pneumococcal pneumonia in the elderly with chronic respiratory diseases.