ArticleEClinicalMedicine2025
Immunogenicity and reactogenicity of a booster dose of a typhoid conjugate vaccine (TCV) in Malawian pre-school children.
Article in EClinicalMedicine, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers, 1 of them a synthesis that pooled it.
What it found
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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.
The trial behind it
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.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
2 citing papers in PubMed, 1 synthesis or guideline pooled it.
- Efficacy, immunogenicity, and safety of typhoid conjugate vaccines in children and adolescents: a systematic review and meta-analysis.Infection · 2026Pooled it
- Development of an 8-valentFrontiers in immunology · 2026Article
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Authors and funding
16 authors.
Funding
Abstract
Background: We assessed persistence of typhoid immunity conferred by Vi polysaccharide-tetanus toxoid (Vi-TT) conjugate vaccine (TCV) four years post-vaccination and immunogenicity of a booster dose of Vi-TT given at age five. Methods: In 2018, a phase 3 trial of Vi-TT in Malawi randomised children 1:1 to receive Vi-TT or meningococcal capsular group A conjugate vaccine (control). Subsequently, TCV was licensed and recommended in the region. In 2023, children vaccinated at 9-11 months in the original trial received a second (Booster- TCV) or first (1st-TCV) Vi-TT dose, at age five. Serum collected at days 0, 28, and 160-180 days after vaccination was tested for anti-Vi immunoglobulin (Ig)G and IgA, reported as enzyme-linked immunosorbent assay units (EU)/mL. Seroconversion was ≥4-fold rise in antibody titers from day 0 to day 28 post-vaccination. Safety outcomes included adverse events during follow-up. Findings: We enrolled 136 children: 72 Booster-TCV and 64 1st-TCV. At baseline, anti-Vi IgG geometric mean titers (GMT) were higher in Booster-TCV (18.8 EU/mL, 95% CI 15.2-23.2) than 1st-TCV (5.7 EU/mL, 4.6-7.2) arms. GMT increased significantly between days 0 and 28 in both arms, with higher levels in Booster-TCV (6867.9 EU/mL, 5794.1-8140.6) than 1st-TCV (2912.0 EU/mL, 2429.2-3490.7) arms, representing a 375.7 and 492.6 geometric mean fold rise, respectively. On day 28, all Booster-TCV children, and all but one 1st-TCV child, seroconverted. Similar trends were seen for IgA. Vi-TT reactogenicity was similar between vaccine arms. Interpretation: This study demonstrates sustained Vi-TT immunogenicity four years post-vaccination at 9-11 months old, and robust immune response following a booster dose at five years of age, informing policy decisions on TCV use in children. Funding: Bill & Melinda Gates Foundation (INV-030857).
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