Yellow fever vaccine Pregnancy and Breastfeeding Warnings Yellow
fever vaccine is also known as: YF-Vax Yellow fever vaccine
Pregnancy Warnings In a study of 101 women vaccinated with the
17D-204 strain, most of whom were in the third trimester, the
seroconversion rate was 38.6% compared to 81.5% for nonpregnant
controls. No adverse events were reported in infants in this
study and another study. No birth defects were reported by the
Collaborative Perinatal Project in 3 mother-child pairs who were
exposed to yellow fever vaccine during the first trimester. A
report from the European Network of Teratology Information
Systems concluded that there was not an association between
adverse outcomes and vaccination, although the data sample was
small. The rate of major malformations and abortions occurring
after first trimester exposure was within expected ranges. One
of 41 infants whose mothers were vaccinated during the first
trimester tested positive for IgM antibodies in cord blood. No
adverse sequelae were repor