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Fever during pregnancy more than doubles risk of autism & developmental delay risk; fever-lowering meds even the odds

  [ 5 votes ]   [ Discuss This Article ]
www.ProHealth.com • May 24, 2012


A team of researchers at University of California Davis has found that mothers who had a fever at some point during their pregnancy were 2.1 to 2.5 times more likely to have a child with autism or developmental delay than were mothers of typically developing children - but that there was no increased risk in cases where the mother took measures to lower the fever.

"Our study provides strong evidence that controlling fevers while pregnant may be effective in modifying the risk of having a child with autism or developmental delay," says lead author Ousseny Zerbo, PhD. "We recommend that pregnant women who develop fever take anti-pyretic [fever-lowering] medications and seek medical attention if their fever persists."

Published May 5 by the Journal of Autism and Developmental Disorders, their study(1) is believed to be the first to consider how fever from any cause, including the flu, and its treatment during pregnancy could affect the likelihood of having a child with autism or developmental delay.

The results are based on data from a large, case-control investigation known as the Childhood Autism Risk from Genetics and the Environment (CHARGE) Study.

Another recent study based on CHARGE data found that mothers who were obese or diabetic had a higher likelihood of having children with autism.

Co-author Irva Hertz-Picciotto, PhD, MPH, a UC Davis professor and principal investigator of CHARGE, points out that:

• Fever is produced by acute inflammation - the short-term, natural immune system reaction to infection or injury,

• And chronic inflammation, which no longer serves a beneficial purpose and can damage healthy tissue, may be present in mothers with metabolic abnormalities like diabetes and obesity.

"Since an inflammatory state in the body accompanies obesity and diabetes as well as fever," says Dr. Hertz-Picciotto, "the natural question is: Could inflammatory factors play a role in autism?"

"We definitely think more research is necessary to pinpoint the ways that inflammation could alter brain development," she adds, because when people are infected by bacteria or viruses, the body generally reacts by mounting a healing response that involves the release of pro-inflammatory cytokines from white blood cells into the bloodstream.

And importantly, some cytokines are able to cross the placenta, so therefore could reach the fetal central nervous system, potentially altering levels of neurotransmitters and brain development.

CHARGE includes an ethnically diverse population of children aged 2 to 5 years born in California and living in Northern California. The current study included 538 children with autism, 163 children with developmental delay but not autism, and 421 typically developing children whose mothers answered standardized questionnaires about whether they had the flu and/or fever during pregnancy and if they took medications to treat their illnesses.

The results showed that:

• Flu during pregnancy was not associated with greater risks of having a child with autism or developmental delay.

• Fever from any cause during pregnancy, however, was far more likely to be reported by mothers of children with autism (2.12 times higher odds) or developmental delay (2.5 times higher odds), as compared with mothers of children who were developing typically.

• For children of mothers who took anti-fever medication, the risk of autism was not different from the risk in children whose mothers reported no fever.

According to Dr. Hertz-Picciotto, results based on CHARGE data are noteworthy because of the study's large population-based sample and detailed information on participants.

Other CHARGE evaluations have found that taking prenatal vitamins prior to and during the first month of pregnancy may help prevent autism, and that living near a freeway or in areas with high regional air pollution is associated with higher risk of autism in children.

"CHARGE has obtained a wealth of environmental, demographic and medical information on young children and their parents and provides a solid basis for a variety of epidemiologic studies," Dr. Hertz-Picciotto says. "Those studies are helping us find ways to protect childhood neurodevelopment."

____

1. “Is Maternal Influenza or Fever During Pregnancy Associated with Autism or Developmental Delays? Results from the CHARGE (CHildhood Autism Risks from Genetics and Environment) Study,” Journal of Autism and Developmental Disorders, May 5, 2012.

Source: Based on UC Davis Health System news release, May 23, 2012



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