Analysis of pregnant women helps firm up numbers, timing of virus’s effect on fetuses
For pregnant women infected with Zika virus in the first trimester, the future is foreboding.
Nearly 11 percent of U.S. women likely exposed to Zika in the early weeks of or just before pregnancy had babies or fetuses with birth defects, researchers report online December 13 in JAMA. The new study offers the first results from the U.S. Zika Pregnancy Registry, which the Centers for Disease Control and Prevention and state and local health departments use to track Zika-affected pregnancies.
As of November 30, the registry had reported more than 3,800 pregnant women in the United States and its territories with evidence of Zika infection. Out of 442 pregnancies tracked so far, 26 — or 6 percent — resulted in infants or fetuses with birth defects, including microcephaly and other brain