title: Prevalence of self-reported infection during pregnancy among control mothers in the National Birth Defects Prevention Study.
abstract: BACKGROUND
  Although specific maternal infections during pregnancy have been associated with birth defects and other adverse pregnancy outcomes, the prevalence of infections during pregnancy has not been well described.
  
  
  METHODS
  We estimated the prevalence of self-reported infection among 4967 women with live-born infants without major birth defects. We assessed the prevalence of reported infections and fever by type of infection, specific illness, and maternal characteristics including race and age.
  
  
  RESULTS
  Overall, 63.6% of women reported at least one infection during pregnancy. Reports of infections were more common during pregnancy than in the 3 months before pregnancy. Nearly half (49.6%) of women reported a respiratory infection, 20.5% reported a fever, 17.1% reported a urinary tract infection, 4.2% reported a yeast infection, and 3.4% reported a sexually transmitted disease. A subanalysis of self-reported infection and preterm delivery was performed among primiparous mothers with singleton pregnancies, but no statistically significant differences in infection prevalence were found. Women younger than 35 years reported nonrespiratory infections more frequently than women aged 35 years or older (prevalence ratio [PR] 1.41; 95% confidence interval [CI]: 1.21-1.64). Prevalence of nonrespiratory infections was also higher among those who smoked than among those who did not (PR 1.33; 95% CI: 1.20-1.47).
  
  
  CONCLUSIONS
  Reported infections during pregnancy are common, implying that a small increase in risk for birth defects or other adverse pregnancy outcomes could have a significant public health effect and underscoring the importance of understanding the effects of prenatal infections.
authors.affiliation: Oak Ridge Institute for Science and Education, Oak Ridge, Tennessee, USA. scollier@cdc.gov
authors.forename: Sarah A
authors.initials: SA
authors.lastname: Collier
authors.forename: Sonja A
authors.initials: SA
authors.lastname: Rasmussen
authors.forename: Marcia L
authors.initials: ML
authors.lastname: Feldkamp
authors.forename: Margaret A
authors.initials: MA
authors.lastname: Honein
mesh_terms: D000328:Adult; D000013:Congenital Abnormalities / Q000453:epidemiology; D003625:Data Collection; D005260:Female; D006801:Humans; D011247:Pregnancy; D011251:Pregnancy Complications, Infectious / Q000453:epidemiology*; D047928:Premature Birth / Q000453:epidemiology; D015995:Prevalence; D012141:Respiratory Tract Infections / Q000453:epidemiology; D012749:Sexually Transmitted Diseases / Q000453:epidemiology; D014552:Urinary Tract Infections / Q000453:epidemiology