Abstract:
BACKGROUND:Pneumococcal conjugate vaccines (PCV) were first licensed for use with 3 primary doses in infancy and a booster dose. The evidence for the effects of different schedules was examined in this systematic review and meta-analysis. METHODS:We searched 12 databases and trial registers up to March 2010. We selected randomised controlled trials (RCTs), cohort and case-control studies making direct comparisons between PCV schedules with (2p) or (3p) primary doses, with (+1) or without (+0) a booster dose. We extracted data on clinical, nasopharyngeal carriage and immunological outcomes and used meta-analysis to combine results where appropriate. RESULTS:Seropositivity levels (antibody concentration ≥0.35 μg/ml) following 3p and 2p PCV schedules were high for most serotypes (5 RCTs). Differences between schedules were generally small and tended to favour 3p schedules, particularly for serotypes 6B and 23F; between-study heterogeneity was high. Seropositivity levels following 3p+1 and 2p+1 schedules were similar but small differences favouring 3p+1 schedules were seen for serotypes 6B and 23F. We did not identify any RCTs reporting clinical outcomes for these comparisons. In 2 RCTs there was weak evidence of a reduction in carriage of S. pneumoniae serotypes included in the vaccine when 3p+0 schedules were compared to 2p+0 at 6 months of age. CONCLUSIONS:Most data about the relative effects of different PCV schedules relate to immunological outcomes. Both 3p and 2p schedules result in high levels of seropositivity. The clinical relevance of differences in immunological outcomes between schedules is not known. There is an absence of clinical outcome data from RCTs with direct comparisons of any 2p with any 3p PCV schedule.
journal_name
Vaccinejournal_title
Vaccineauthors
Scott P,Rutjes AW,Bermetz L,Robert N,Scott S,Lourenço T,Egger M,Low Ndoi
10.1016/j.vaccine.2011.07.042subject
Has Abstractpub_date
2011-12-06 00:00:00pages
9711-21issue
52eissn
0264-410Xissn
1873-2518pii
S0264-410X(11)01074-7journal_volume
29pub_type
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