A new CDC report highlights the serious threat caused by Zika virus infection during pregnancy and the need for pregnant women to continue taking steps to prevent Zika virus exposure through mosquito bites and sexual transmission. The Vital Signs report found that of the 250 U.S. pregnant women who had confirmed Zika infection last year, 24 had a fetus or baby with Zika-related birth defects. "Zika continues to be a threat to pregnant women across the U.S.," said CDC Acting Director Anne Schuchat, MD. "With warm weather and a new mosquito season approaching, prevention is crucial to protect the health of mothers and babies." The report noted the importance of health care providers screening all pregnant women for possible Zika virus exposure and testing and evaluating all babies born to women with evidence of infection. Among the key findings of the report are that 44 states reported pregnant women with evidence of Zika in 2016, with most acquiring the infection during travel to an area with Zika; nearly 1,300 pregnant women with evidence of possible Zika infection were reported to the U.S. Zika Pregnancy Registry; and among pregnant women with confirmed Zika infection, about 1 in 10 had a fetus or baby with birth defects. Confirmed infections in the first trimester posed the greatest risk, with about 15% having Zika-related birth defects. CDC encourages health care providers to educate families on Zika prevention, provide all needed tests and followup care, and support babies and families.