Brasil, P., Pereira, J., Gabaglia, C., et al. (2016). Zika Virus Infection in Pregnant Women in Rio de Janeiro - Preliminary Report. The New England Journal of Medicine.
Researchers in Rio de Janeiro enrolled 88 pregnant women in a prospective study, where they were tested for Zika virus and then followed throughout their pregnancies. Seventy-two of the 88 women enrolled tested positive for Zika virus infection. The authors concluded that “despite mild clinical symptoms, Zika virus infection during pregnancy appears to be associated with grave outcomes, including fetal death, placental insufficiency, fetal growth restriction, and CNS injury.”