Aedes aegypti mosquitoes are seen at the Laboratory of Entomology and Ecology of the Dengue Branch of the U.S. Centers for Disease Control and Prevention in San Juan, Puerto Rico on March 6, 2016. (Photo by Alvin Baez/Reuters)

Experts warn of hidden Zika birth defects

The explosion of cases of birth defects caused by Zika virus may be the "tip of the iceberg," experts said Sunday. Many cases have probably been missed because babies looked normal when they were born. But hidden birth defects are almost certain to turn up as the babies grow, they told a meeting of pediatricians Sunday in Baltimore.

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