Factors affecting immunogenicity of BCG in infants, a study in Malawi, The Gambia and the UK.

Abstract:

BACKGROUND:BCG immunogenicity in infants differs between populations and these differences have been attributed to various factors. In this study, the influence of geographical location, season of birth, timing of vaccination, micronutrient status (zinc) and inflammatory status (C-reactive protein, CRP) were assessed. METHODS:Immunogenicity was assessed by cytokine signature in culture supernatants from diluted whole blood samples stimulated with M. tuberculosis PPD, using a multiplex bead assay. Results were correlated with the plasma zinc and CRP concentrations at the time of sampling, and with interview and household data. BCG vaccinated infants were recruited in Malawi, The Gambia and the UK. RESULTS:In Malawi, infants vaccinated within the first week after birth showed lower production of most cytokines measured than those vaccinated later. The number of cytokines showing significant differences between Malawian and Gambian infants decreased after adjusting for season of birth. In Malawi, a proportion of infants had zinc deficiency and elevated plasma CRP (>10 mg/L), but neither zinc deficiency nor high CRP was associated with production of any of the cytokines measured. CONCLUSIONS:The cytokine/chemokine signatures observed in response to M. tuberculosis PPD in infants at 3 months post BCG vaccination were affected by geographical location, season of birth, and timing of vaccination but not associated with the concentration of plasma zinc or inflammatory status. These factors should be considered in future trials of new TB vaccines.

journal_name

BMC Infect Dis

journal_title

BMC infectious diseases

authors

Hur YG,Gorak-Stolinska P,Lalor MK,Mvula H,Floyd S,Raynes J,Ben-Smith A,Fitchett JR,Flanagan KL,Burl S,Ota MO,Crampin AC,Smith SG,Dockrell HM

doi

10.1186/1471-2334-14-184

subject

Has Abstract

pub_date

2014-04-05 00:00:00

pages

184

issn

1471-2334

pii

1471-2334-14-184

journal_volume

14

pub_type

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