Roseola Associated With Higher Subsequent Epilepsy Risk in Korean Cohort

Researchers used South Korea’s National Health Insurance Service database to conduct a retrospective cohort study covering 2002–2021. They matched 797,747 children diagnosed with roseola infantum to 797,747 children without roseola by age and sex. Participants had a mean age of 1.15 years at cohort entry and were followed for a mean of 10.5 years. The primary epilepsy definition required at least two relevant medical encounters and antiseizure medication prescriptions totaling at least 180 days.

Roseola was associated with a higher risk of subsequent epilepsy (adjusted hazard ratio [HR], 2.00; 95% CI, 1.91–2.09). The association persisted in sensitivity analyses using a more inclusive epilepsy definition (adjusted HR, 1.52; 95% CI, 1.48–1.57). Postindex febrile convulsion had the strongest independent association with epilepsy (adjusted HR, 12.31; 95% CI, 11.82–12.83).

The findings show a population-level association, not that roseola causes epilepsy. The retrospective study relied on insurance claims and diagnostic codes; the authors note that prospective research with virologic confirmation and detailed epilepsy phenotyping is needed.