In about 4% of completed pregnancies where the mother had Zika virus infection, the fetus or infant had evidence of possible Zika-related microcephaly with brain abnormalities, and 6% had other possible Zika-related birth defects. The rate of possible Zika-related birth defects was higher, 11%, among women with Zika virus infection during the first trimester.
These findings were reported in “Birth Defects Among Fetuses and Infants of US Women With Evidence of Possible Zika Virus Infection During Pregnancy” by Margaret A. Honein, Ph.D.; April L. Dawson, MPH; Emily E. Petersen, M.D.; et al. The researchers sought . . .