Maternal influenza infection during pregnancy does not increase the risk for autism spectrum disorder (ASD) in children, according to Ousseny Zerbo, PhD, and associates.
In a study of 196,929 mother-child pairs (the children were born at Kaiser Permanente Northern California between Jan. 1, 2000, and Dec. 31, 2010), 1.6% of the children were diagnosed with ASD. Influenza was diagnosed in 0.7% of mothers during their pregnancy, and 23% received an influenza vaccination during pregnancy.
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Overall, maternal influenza vaccination did not effect likelihood of ASD diagnosis, with 1.7% of children in this group receiving an ASD diagnosis. A small association between ASD diagnosis and maternal influenza vaccination, however, was seen in the first trimester of pregnancy, with an adjusted hazard ratio of 1.2, translating to a potential extra 4 cases of autism per 1,000 births. But further analysis suggested that this could be caused by bias and chance, and “the association was insignificant after statistical correction for multiple comparisons,” the investigators said.
“While we do not advocate changes in vaccine policy or practice, we believe that additional studies are warranted to further evaluate any potential associations between first-trimester maternal influenza vaccination and autism,” the investigators concluded.
Find the full study in JAMA Pediatrics (doi: 10.1001/jamapediatrics.2016.3609).