with the flu during pregnancy no increased risk of autism or developmental delay in children, while fever could have during pregnancy.
And birth by caesarean section is not associated with autism in children, but with diabetes or high blood pressure or seems to be not obese, while pregnant.
Are that the results that affect the risk of autism in children can have several new studies which reveal factors during pregnancy. The research was Wednesday during a press conference has presented the International Conference for Autism Research (IMFAR) in San Diego.
One in 110 U.S. children have an autism spectrum disorder, a's delayed neurological development of condition of characterized by problems with language, communication and social work, as well as repetitive or restrictive behavior. Many children with autism have other conditions including epilepsy, anxiety disorders and stomach problems.
Recent research has found that autism is diagnosed on the rise, of which some greater awareness and increased availability of autism due to services could be, experts said. Still other research suggests the actual frequency of autism and increases.
"Autism is an incredibly complex disease as is now almost 1 percent of the children", IMFAR said President David Amaral.
The cause of autism is unknown, although some research, including the papers on IMFAR, reference to some maternal factors presented, which could contribute to the development of the child's disorder.
In the first study, participation in the childhood-based population research data from the research on 1,000 kids looked at autism risks from genetics and environment (fee) study, which included 462 with an autism spectrum disorder, 136 with other development disorders and 265 development usually children between 2 and 5. The researchers investigated reports of influenza or fever also mother during pregnancy.
Researchers found no link between autism or other developmental delay and the flu during each trimester of pregnancy.
But in a weighted analysis, were the mothers of children who are diagnosed with an autism spectrum disorder co author Irva Hertz-Picciotto, Deputy Director of the University of California were almost twice as often as mothers of children without autism report fever during pregnancy, said, Davis's MIND study Institute (medical investigation of Neurodevelopmental errors).
The risks were particularly increased when mothers with fever reported during the second trimester.
Previous research is suggested an association between viral infections during pregnancy and autism. Researchers still the mother believe inflammatory response to the virus, rather than any particular virus itself, influences of the child's brain development.
"These results a growing body of evidence add, that maternally mediated inflammation could be part of mechanistic pathway to autism," said Hertz-Picciotto.
The researchers stressed, however, that the results were preliminary, and the Club did not reach statistical significance in an analysis where she did not apply the sampling weights.
Along this same vein analyzed another study, that at the meeting of researchers from Denmark of amniotic fluid samples collected by pregnant women in Copenhagen since 1982. Later, some of the women's were diagnosed children with autism.
The study found no differences in the hospital stays for infections during pregnancy, but she found, that the mothers were autistic children more levels certain inflammatory marker-in particular a cytokine called TNFa have increased. For reasons not well understood the inflammatory markers in the mothers of the girls with autism were particularly high.
"Overall our findings not only support the idea that immune dysfunction plays an important role in autism, but also confirm that this actually happens before birth," the authors wrote.
In a third study, from data from the study free of charge, researchers looked at mothers, the diabetes (type 2 and gestational), having hypertension, chronic and curing obesity.
The study found that children of mothers with these conditions have significantly more likely to autism or an other developmental delay were.
"For mothers with at least one of the three conditions, their children had a 60 percent increased risk of autism and developmental delays, it was a risk that 150 percent," Hertz-Picciotto said.
Researchers also found that children of diabetic mother have expressive language skills also poorer tends to be, whether the children autism or had not.
A fourth study, also data on about 500 children with autism and 300 without autism from the study on Cesareans and autism, saw used for free.
The study found no link between birth pains method and autism.
After an emergency c section for a difficult employer-including effort to membrane rupture or infection was the amniotic cave-however a risk increased autism in children.
As researchers for other factors, such as pre-eclampsia, maternal age, diabetes control, risk associated with increased autism are, the mode of delivery was no longer significant.
The good news is, that many of the factors described in the three studies "can be changed" are, which means, that if confirmed risk factors for autism, it is possible, be they change can be, said Hertz-Picciotto.
"We want to prevent able to intervene and potentially autism in the future," she said.
Experts note that research at meetings not to the same type of strict control, the research in medical journals has undergone published and provisional as should.
More information
The National Institute of neurological disorders and stroke has more about autism.
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