A US study found no association between a higher risk of
autism and influenza or any link between autism and vaccination against the flu
Researchers found no link between influenza in pregnant
women and the risk of her child developing autism after birth, according to a
No vaccination link
Some earlier research has pointed to maternal infections as
a possible cause of the neuro-developmental disorder, though other studies have
not found any such link.
The findings in the Journal of the American Medical
Association (JAMA) Paediatrics involved more than 196,000 children born in
California from 2000 to 2010.
More than 3,100 children in the group had autism, which is
believed to have genetic and environmental triggers but its causes remain
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The study, led by Ousseny Zerbo of Kaiser Permanente
Northern California, found no association between a higher risk of autism and
influenza infection while pregnant.
Nor did it find any link between autism and vaccination
against the flu during the second and third trimesters of pregnancy.
"There was a suggestion of increased risk of autism
spectrum disorder (ASD) with maternal vaccination in the first trimester,"
said the study, which went on to explain that this finding "was not
statistically significant" after researchers adjusted for other risk
The researchers said that at this time no "changes in
vaccine policy or practice", are recommended but "additional studies
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