Prenatal maternal infections and psychopathology in childhood and adolescence: Findings from the ALSPAC birth cohort
Aims: Studies have suggested that exposure to prenatal infections may be a risk factor in the aetiology of neurodevelopmental disorders such as schizophrenia and autism, but that its effects may differ by timing of exposure. Evidence on other psychiatric outcomes, however, is scarce and mixed. The aims of this study were to examine whether exposure to infections, at any point in gestation and during each trimester, is associated with increased odds of psychiatric disorders (pervasive developmental disorders, attention-deficit hyperactivity disorder, behavioural disorders and emotional disorders) at ages 7 and 14. Methods: Participants were n = 8859 mother and child pairs from the UK Avon Longitudinal Study of Parents and Children (ALSPAC) cohort. Exposure to prenatal infections was assessed for each trimester using maternal self-reports. Children’s psychiatric status was assessed using the parent-reported Development and Well-being Assessment (DAWBA). Logistic regressions were used to examine links between prenatal infections and child outcomes. Results: Half of the mothers reported an infection at some point during pregnancy and 7% of children were reported to have a psychiatric condition. Increased odds of children having any psychiatric disorder at age 14 were found in association with infections at any point during pregnancy, OR = 1.27 (95% CI 1.04, 1.55) and in the third trimester specifically, OR = 1.28 (95% CI 1.02, 1.61), after adjusting for the effects of potential confounds and other covariates. No other links were found in adjusted models. Conclusions: Findings suggest that associations between prenatal infections and children’s psychiatric disorders are weak to non-existent, after adjusting for the effects of other factors.