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Original Investigation
March 6, 2019

Long-term Risk of Neuropsychiatric Disease After Exposure to Infection In Utero

Author Affiliations
  • 1Department of Pediatrics, Seattle Children’s Hospital and University of Washington, Seattle
  • 2Centre for Perinatal Medicine & Health, Department of Obstetrics & Gynecology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
  • 3Division of Health Data and Digitalisation, Department of Genetics and Bioinformatics, Norwegian Institute of Public Health, Oslo, Norway
  • 4Department of Epidemiology, School of Public Health, University of Washington, Seattle
  • 5Department of School Psychology, College of Education, University of Washington, Seattle
  • 6Department of Psychiatry and Behavioral Sciences, University of Washington, Seattle
  • 7Centre for the Developing Brain, King’s College, London, United Kingdom
  • 8Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
  • 9Center for Global Infectious Disease Research, Seattle Children’s Research Institute, Seattle, Washington
  • 10Department of Global Health, University of Washington, Seattle
  • 11Center for Innate Immunity and Immune Disease, Department of Obstetrics & Gynecology, University of Washington, Seattle
JAMA Psychiatry. 2019;76(6):594-602. doi:10.1001/jamapsychiatry.2019.0029
Key Points

Question  Does exposure to maternal infection during pregnancy increase the long-term risk for major psychiatric disorders in the child?

Findings  In this Swedish population-based cohort study of children born between 1973 and 2014, exposure to infection in pregnancy significantly increased the risk for autism spectrum disorder and depression.

Meaning  Maternal infection during pregnancy may be responsible for some portion of autism and depression in childhood and adulthood among the exposed offspring.

Abstract

Importance  The developmental origins of mental illness are incompletely understood. Although the development of autism and schizophrenia are linked to infections during fetal life, it is unknown whether more common psychiatric conditions such as depression might begin in utero.

Objective  To estimate the risk of psychopathologic conditions imparted from fetal exposure to any maternal infection while hospitalized during pregnancy.

Design, Setting, and Participants  A total of 1 791 520 Swedish children born between January 1, 1973, and December 31, 2014, were observed for up to 41 years using linked population-based registries. Children were excluded if they were born too late to contribute person-time, died before being at risk for the outcome, or were missing particular model data. Infection and psychiatric diagnoses were derived using codes from hospitalizations. Directed acyclic graphs were developed from a systematic literature review to determine Cox proportional hazards regression models for risk of psychopathologic conditions in the children. Results were evaluated using probabilistic and simple bias analyses. Statistical analysis was conducted from February 10 to October 17, 2018.

Exposures  Hospitalization during pregnancy with any maternal infection, severe maternal infection, and urinary tract infection.

Main Outcomes and Measures  Inpatient diagnosis of autism, depression, bipolar disorder, or psychosis among offspring.

Results  A total of 1 791 520 Swedish-born children (48.6% females and 51.4% males) were observed from birth up to age 41 years, with a total of 32 125 813 person-years. Within the directed acyclic graph framework of assumptions, fetal exposure to any maternal infection increased the risk of an inpatient diagnosis in the child of autism (hazard ratio [HR], 1.79; 95% CI, 1.34-2.40) or depression (HR, 1.24; 95% CI, 1.08-1.42). Effect estimates for autism and depression were similar following a severe maternal infection (autism: HR, 1.81; 95% CI, 1.18-2.78; depression: HR, 1.24; 95% CI, 0.88-1.73) or urinary tract infection (autism: HR, 1.89; 95% CI, 1.23-2.90; depression: HR, 1.30; 95% CI, 1.04-1.61) and were robust to moderate unknown confounding. Within the directed acyclic graph framework of assumptions, the relationship between infection and depression was vulnerable to bias from loss to follow-up, but separate data from the Swedish Death Registry demonstrated increased risk of suicide among individuals exposed to pregnancy infection. No evidence was found for increased risk of bipolar disorder or psychosis among children exposed to infection in utero.

Conclusions and Relevance  These findings suggest that fetal exposure to a maternal infection while hospitalized increased the risk for autism and depression, but not bipolar or psychosis, during the child’s life. These results emphasize the importance of avoiding infections during pregnancy, which may impart subtle fetal brain injuries contributing to development of autism and depression.

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