A study yesterday in JAMA Network Open shows a higher risk of childhood seizures—but not epilepsy—in kids born to moms who contracted flu during pregnancy.
Maternal fever in pregnancy has been linked to poor outcomes in children, including increased risk of neuropsychiatric conditions such as autism and depression. The study sought to define the relationship between maternal flu and febrile seizures, which typically occur from 6 months to 5 years of age.
The findings come from 1,316,107 mother-baby pairs identified from January 1, 2004, to December 31, 2013, using records in Taiwan's Maternal and Child Health Database. Children were followed up until December 31, 2020.
Among the 75,835 children whose mothers had flu during pregnancy, 2,456 (3.2%) developed seizures during their follow-up period, the authors said.
Boys more likely to have seizures
The cumulative risk of childhood seizures was significantly higher among children who had been exposed to maternal influenza virus infections.
The adjusted hazard ratios were 1.09 (95% confidence interval [CI], 1.05 to 1.14) for seizures, 1.11 (95% CI, 1.06 to 1.17) for febrile convulsions, and 1.04 (95% CI, 0.97 to 1.13) for epilepsy. Further analysis showed the risk of epilepsy was not statistically significant.
For all children in the study, advanced maternal age, gestational high blood pressure, cesarean delivery, and being a boy were associated with increased risk of seizures.
"Further studies are needed to elucidate the mechanisms underlying childhood neurological development," the authors concluded.