The Centers for Disease Control and Prevention said Friday that it is monitoring 279 pregnant women with likely Zika virus infections across U.S. states and territories. The largest number of cases by far are in Puerto Rico, where officials are keeping tabs on 122 pregnant women. But they also are tracking 157 other pregnant women across the country.
"One challenge of this Zika virus outbreak is the lack of understanding of the magnitude of risk and the spectrum of outcomes associated with Zika virus infection during pregnancy," researchers wrote in a report published Friday. The surveillance effort, they noted, is expected to change that, "enha...
Also read: Four new cases of Zika reported Thursday