ReviewInfectious diseases and therapy2025
Effectiveness of a Single Dose of Pneumococcal Conjugate Vaccine Against Invasive Pneumococcal Disease in Children: A Systematic Literature Review.
Review in Infectious diseases and therapy, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
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Authors and funding
7 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
introductionWhile pneumococcal conjugate vaccines (PCVs) are typically administered to infants using a three- or four-dose regimen, children may receive less immunogenic regimens due to missed doses or alternative schedules. The level of direct protection in children vaccinated with a single dose of PCV remains unclear.
methodsWe performed a systematic review of observational studies published during 2000-2024 on vaccine effectiveness (VE) of a single dose of PCV7, PCV10, or PCV13 against vaccine-type invasive pneumococcal disease (IPD) in children. Results were stratified by vaccine and age at administration, and meta-analysis performed to generate pooled VE estimates.
resultsTwenty-seven studies met the inclusion criteria: nine reported VE for PCV7, four for PCV10, seven for PCV13, and seven reported VE separately for more than one PCV. For PCV7, pooled VE was 64.6% (95% CI 47.3, 76.2) when administered < 12 months or age unspecified and 81.6% (95% CI 72.5, 87.7) when given ≥ 12 months. For PCV10, pooled VE was 73.0% (95% CI - 29.4, 94.4) when age at vaccination was unspecified, and one study reported 68.0% (95% CI 17.6, 87.6) VE when administered ≥ 12 months. For PCV13, pooled VE was 56.8% (95% CI 44.1, 66.6) when administered < 12 months or age unspecified, and 79.2% (95% CI 65.5, 87.5) when given ≥ 12 months.
conclusionsAvailable evidence demonstrates that a single dose of PCV provides protection against vaccine-type IPD, especially when administered after age 12 months. While complete vaccination according to licensed schedules provides optimal protection, our findings support single-dose catch-up programs for toddlers. Potential single-dose strategies for infants in humanitarian emergencies warrant further exploration.
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