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Hospital-diagnosed maternal infections linked to increased autism risk, study suggests

Date:
December 23, 2013
Source:
Kaiser Permanente
Summary:
Hospital-diagnosed maternal bacterial infections during pregnancy were associated with an increased risk of autism spectrum disorders in children, according to a study published.

Women with bacterial infections diagnosed during a hospitalization had a 58 percent greater risk of having a child with an Autism Spectrum Disorder (ASD). Infections diagnosed during a hospitalization in the second trimester were associated with children having more than a three-fold increased risk of developing ASD.
Credit: photographmd / Fotolia

Hospital-diagnosed maternal bacterial infections during pregnancy were associated with an increased risk of autism spectrum disorders in children, according to a Kaiser Permanente study published Dec. 23 in the Journal of Autism and Developmental Disorders.

The research contributes new evidence to a body of scientific literature on the role of infection in autism risk and points to areas for further examination.

The study included 407 children with autism and 2,075 matched children who did not have autism. The study included infants born between January 1995 and June 1999 who remained members of the Kaiser Permanente health plan for at least two years following birth.

"Though infections in pregnant women are fairly common, in this study most were not associated with an increased risk of autism," said Lisa A. Croen, PhD, research scientist with the Kaiser Permanente Division of Research and senior author of the study. "Only bacterial infections diagnosed in the hospital were associated with an increased risk."

"Infections diagnosed in a hospital setting were more common among mothers of children who developed an ASD compared with mothers of children who did not develop an ASD," Croen further explained.

Women with bacterial infections diagnosed during a hospitalization (including of the genitals, urinary tract and amniotic fluid) had a 58 percent greater risk of having a child with an ASD. While not very common in any of the mothers studied (1.5 percent of mothers of a child with ASD vs. 0.5 percent of mothers of a child without ASD), infections diagnosed during a hospitalization in the second trimester were associated with children having more than a three-fold increased risk of developing ASD.

"Infections diagnosed in an inpatient setting may represent more severe infections, and these were associated with increased risk of ASD," said Ousseny Zerbo, PhD, research fellow with the Kaiser Permanente Division of Research and the study's lead author.

While the mechanism for how maternal infections may influence autism risk has not been firmly established, Zerbo said animal tests have shown that immune-system responses to infections during pregnancy may influence the neurological development of the fetus.

"Our findings indicate that although most infections during pregnancy were not associated with autism in the child, there appears to be some increased risk for autism," Zerbo said. "It would be prudent for pregnant women to contact their doctor if they suspect an infection."


Story Source:

The above story is based on materials provided by Kaiser Permanente. Note: Materials may be edited for content and length.


Journal Reference:

  1. Ousseny Zerbo, Yinge Qian, Cathleen Yoshida, Judith K. Grether, Judy Water, Lisa A. Croen. Maternal Infection During Pregnancy and Autism Spectrum Disorders. Journal of Autism and Developmental Disorders, 2013; DOI: 10.1007/s10803-013-2016-3

Cite This Page:

Kaiser Permanente. "Hospital-diagnosed maternal infections linked to increased autism risk, study suggests." ScienceDaily. ScienceDaily, 23 December 2013. <www.sciencedaily.com/releases/2013/12/131223131143.htm>.
Kaiser Permanente. (2013, December 23). Hospital-diagnosed maternal infections linked to increased autism risk, study suggests. ScienceDaily. Retrieved July 31, 2014 from www.sciencedaily.com/releases/2013/12/131223131143.htm
Kaiser Permanente. "Hospital-diagnosed maternal infections linked to increased autism risk, study suggests." ScienceDaily. www.sciencedaily.com/releases/2013/12/131223131143.htm (accessed July 31, 2014).

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