The first report on the how Zika virus affected U.S. territories showed that 5 percent of women with confirmed infections had babies with birth defects, U.S. health officials said on Thursday.

The report from the U.S. Centers for Disease Control and Prevention is the first to include official numbers from the territory of Puerto Rico, which on Monday declared that its Zika epidemic had ended, based on data showing the number of new cases has fallen.

The CDC on Thursday continued to reiterate its recommendation that pregnant women not travel to Puerto Rico, noting that Zika remains a risk for pregnant women there and anywhere else the mosquito-borne virus is active.