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Influence of age, social patterns and nasopharyngeal carriage on antibodies to three conserved pneumococcal surface proteins (PhtD, PcpA and PrtA) in healthy young children

Ochs, MM
Brookes, R H
Greenberg, D
Givon-Lavi, N
Dagan, R
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Published in European journal of clinical microbiology & infectious diseases. 2013, vol. 32, no. 1, p. 43-9
Collection Open Access - Licence nationale Springer
Abstract The acquisition of specific antibodies is paramount to protect children against pneumococcal diseases, and a better understanding of how age, ethnicity and/or Streptococcus pneumoniae (Spn) nasopharyngeal carriage influence the acquisition of antibodies to pneumococcal surface proteins (PSP) is important for the development of novel serodiagnostic and immunisation strategies. IgG antibody titres against three conserved PSP (PhtD, PcpA and PrtA) in the sera of 451 healthy children aged 1 to 24 months from Israel [Jewish (50.1 %) and Bedouin (49.9 %)] were measured by enzyme-linked immunosorbent assay (ELISA), while nasopharyngeal swabs from these children were assessed for the presence of Spn. Globally, anti-PhtD and anti-PrtA geometric mean concentrations (GMC; EU/ml) were high at <2.5 months of age [PhtD: 35.3, 95 % confidence interval (CI) 30.6-40.6; PrtA: 71.2, 95 % CI 60-84.5], was lower at 5-7 months of age (PhtD: 10, 95 % CI 8-12.4; PrtA: 17.9, 95 % CI 14.4-22.1) and only increased after 11 months of age. In contrast, an increase in anti-PcpA was observed at 5-7 months of age. Anti-PcpA and anti-PrtA, but not anti-PhtD, were significantly higher in Bedouin children (PcpA: 361.6 vs. 226.3, p = 0.02; PrtA: 67.2 vs. 29.5, p < 0.001) in whom Spn nasopharyngeal carriage was identified earlier (60 % vs. 38 % of carriers <6 months of age, p = 0.002). Spn carriage was associated with significantly higher anti-PSP concentrations in carriers than in non-carriers (p < 0.001 for each PSP). Thus, age, ethnicity and, essentially, nasopharyngeal carriage exert distinct cumulative influences on infant responses to PSP. These specific characteristics are worthwhile to include in the evaluation of pneumococcal seroresponses and the development of new PSP-based vaccines.
Keywords Age FactorsAntibodies, Bacterial/bloodAntigens, Bacterial/immunologyBacterial Proteins/immunologyCarrier Proteins/immunologyCarrier State/epidemiologyChild, PreschoolEnzyme-Linked Immunosorbent AssayEthnic GroupsHumansImmunoglobulin G/bloodInfantIsrael/epidemiologyMaleMembrane Proteins/immunologyNasopharynx/microbiologyPneumococcal Infections/epidemiologySocial NetworkingStreptococcus pneumoniae/immunology
PMID: 22903166
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Article (Published version) (189 Kb) - public document Free access
Research groups Centre de Vaccinologie et d'Immunologie néonatale (177)
Recherche en infectiologie pédiatrique et en pédiatrie générale (853)
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HAGERMAN, Andrés et al. Influence of age, social patterns and nasopharyngeal carriage on antibodies to three conserved pneumococcal surface proteins (PhtD, PcpA and PrtA) in healthy young children. In: European journal of clinical microbiology & infectious diseases, 2013, vol. 32, n° 1, p. 43-9. doi: 10.1007/s10096-012-1712-9 https://archive-ouverte.unige.ch/unige:35277

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Deposited on : 2014-04-02

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