Placental transfers

A prospective, longitudinal cohort study of twenty-eight WNV-infected mothers and 25 WNV-uninfected mothers found "There were no differences in pregnancy and delivery characteristics except that infected mothers had a higher incidence of febrile illnesses and used more medications. Birth weight, length, head circumference, and rate of congenital malformations were similar in babies born to WNV-infected and WNV-uninfected mothers. Follow-up physical exams were generally normal. The Bayley-III assessments, available for 17 children born to mothers with WNV illness, showed performance at or above age level across domains (Pridjian)."

FAQ WNV Pregnancy (CDC)

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Studies have shown no abnormalities in babies born to WNV infected mothers.


CDC. West Nile Virus Home. Frequently Asked Questions. Pregnancy & Breastfeeding. Retrieved 11/5/2017,

Pridjian G, Sirois PA, McRae S, Hinckley AF, Rasmussen SA, et al, (2016). Prospective Study of Pregnancy and Newborn Outcomes in Mothers with West Nile Illness during Pregnancy. Birth Defects Res A Clin Mol Teratol. 2016 August; 106(8): 716–723.