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Early exposure to yellow fever vaccine during pregnancy

Denise P Cavalcanti1, Maria Antonieta Salomão, Jorge Lopez-Camelo

  • 1Programa de Genética Perinatal, Departamento de Genética Médica, FCM, UNICAMP, Campinas, SP, Brazil. denisepc@unicamp.br

Tropical Medicine & International Health : TM & IH
|June 29, 2007
PubMed

Insights

Yellow Fever Vaccination (YFV) during pregnancy did not increase major malformations in newborns. However, a potential link to minor dysmorphisms warrants further investigation.

Area of Science:

  • Medical Research
  • Epidemiology
  • Vaccinology

Background:

  • Yellow Fever Vaccination (YFV) is crucial for disease prevention.
  • Concerns exist regarding the safety of YFV during pregnancy.
  • Understanding potential risks to fetal development is essential.

Purpose of the Study:

  • To assess the association between prenatal Yellow Fever Vaccination (YFV) and structural defects in infants.
  • To determine if YFV exposure during pregnancy increases the risk of major malformations.
  • To investigate potential links to minor dysmorphisms.

Main Methods:

  • An observed/expected frequencies study design was employed.
  • 304 infants exposed to YFV prenatally underwent dysmorphological examinations.
  • Poisson distribution model used to compare malformation rates with a reference population of 10,691 births.

Main Results:

  • The rate of major malformations was 3.3% (CI 1.7-6.3%).
  • No statistically significant increase in major malformations was observed.
  • Minor dysmorphisms, particularly pigmented naevi, were significantly more frequent (P<0.001) in the exposed group.

Conclusions:

  • Prenatal Yellow Fever Vaccination (YFV) does not appear to elevate the risk of major congenital malformations.
  • The observed association with minor dysmorphisms may be due to evaluation bias.
  • A reproductive risk hypothesis for minor dysmorphisms following YFV warrants consideration in future research.
Abstract

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