Published online by Cambridge University Press: 12 July 2006
According to previous case reports, some congenital abnormalities (CAs) of the brain, such as microcephaly, are a result of intrauterine herpes simplex virus infection. A population-based case–control study was conducted to determine the risk of neural tube defects (NTDs) after maternal herpes labialis infection during pregnancy. Data were taken from the Hungarian Case–Control Surveillance of Congenital Abnormalities from 1980 to 1996, which included 1202 children with NTDs and 21641 comparison children with CAs other than NTDs. The adjusted relative risks (odds ratio [OR]) for NTDs associated with maternal herpes labialis in the first trimester of pregnancy was OR 1.19 (95% confidence interval [CI] 0.68–2.06), and in the entire pregnancy was OR 0.94 (95% CI 0.61–1.44). Self-reported maternal herpes labialis during pregnancy was not associated with a substantially increased risk of NTDs in infants.