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• W3183332032 abstract "Abstract Background In rural Gambia, rates of malnutrition and infection are higher during the annual rainy/‘hungry’ season (June–October) in comparison to the dry/‘harvest’ season (November–May). The effects of this seasonal pattern on an infant’s immune development and their capacity to respond to childhood vaccinations remain unclear. The aim of the current analysis was to determine whether antibody responses to diphtheria-tetanus-pertussis (DTP) vaccinations in infants differ between seasons. Methods Infants received the DTP vaccine at 8, 12 and 16 weeks of age and antibody titres were measured in blood samples collected at 12 ( n = 710) and 24 ( n = 662) weeks of age. Mean DTP antibody titres, adjusted for maternal and infant confounders, were compared by t -tests and the effect sizes of the mean differences were calculated between seasons at mid-gestation (20 weeks gestation) and first vaccination (8 weeks of infant age). Results A smaller number of infants received their first vaccination during the rainy/hungry season months compared to the dry/harvest season ( n = 224 vs. n = 486). At 12 weeks, infants vaccinated during the rainy/hungry season had lower weight-for-length Z-scores ( p = 0.01) and were more likely to be anaemic ( p < 0.001). Their mothers, however, were pregnant mostly during the dry/harvest season, had higher weight gain ( p < 0.001) and were less likely to be anaemic during pregnancy ( p < 0.001). At 12 weeks, infants vaccinated during the rainy/hungry season had significantly higher mean diphtheria, tetanus and pertussis antibody titres; by 62.3, 16.9 and 19.7%, respectively (all, p < 0.001). However, at 24 weeks, they had lower mean anti-diphtheria titres (by 20.6%, p < 0.001) compared with infants vaccinated during the dry/harvest season, and no differences were observed in mean tetanus and pertussis antibody titres by vaccination season. Conclusions Infant antibody response to the primary dose of the DTP vaccine was influenced by both season of pregnancy and infancy, although effects were diminished following three doses. Environmental exposures, including nutrition, to both the mother and infant are hypothesised as likely drivers of these seasonal effects." @default.
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• W3183332032 date "2021-07-22" @default.
• W3183332032 modified "2023-10-18" @default.
• W3183332032 title "Seasonal modulation of antibody response to diphtheria-tetanus-pertussis vaccination in infants: a cohort study in rural Gambia" @default.
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• W3183332032 doi "https://doi.org/10.1186/s12889-021-11383-7" @default.
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