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 Disjournal_title
BMC infectious diseasesauthors
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 HMdoi
10.1186/1471-2334-14-184subject
Has Abstractpub_date
2014-04-05 00:00:00pages
184issn
1471-2334pii
1471-2334-14-184journal_volume
14pub_type
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