The remarkable history of pneumococcal vaccination: an ongoing challenge

Pneumonia

Table 3 Recent studies of vaccine efficacy of PPSV23

	Vaccine efficacy in pneumococcal pneumonia (PP)^a
Author, year	All PP	VT PP	Comment
Suzuki 2017 [36]	27%	34%	CC, ≥ 65 years
Djennad 2019 [37]	27%		CC, ≥ 65 years
Kim 2019 [38]		21%	CC, 65–75 years
Lawrence 2020 [39]		24%	CC, persons ≥ 16 years
Vila-Corcoles 2020 [40]	0%		Pop-based cohort ≥ 50 years
Masuda 2021 [41]	61%		CC, ≥ 65 years, CRD

PP Pneumococcal pneumonia, VT Vaccine-type, CC Case control study, Pop Population, CRD Chronic respiratory disease
^a Most of these studies show that protection decreases as age, and time since vaccination, increase

ISSN: 2200-6133