In adults, the 13-valent pneumococcal conjugate vaccine seems to be more immunogenic than the 23-valent polysaccharide pneumococcal vaccine for most of the 12 shared serotypes. However, in mid-2012, routine vaccination of adults has no proven efficacy.
13-valent pneumococcal vaccine: 50 years of age and older. Prescrire international. 2013 Feb;22(135):38
PMID: 23444498
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