The Zika virus can cause brain damage to a fetus, despite normal ultrasound results early in pregnancy, according to a new study, NBC News reported.
There were no telltale signs of birth defects when researchers conducted an ultrasound of a Zika-infected pregnant mother at 13, 16 and 17 weeks. But later ultrasounds revealed other brain abnormalities.
"While this is a single case, it poses troubling questions that could inform future research," said the study's co-senior author, Dr. Adre du Plessis, director of the Fetal Medicine Institute and chief of the Fetal and Transitional Medicine Division at Children's National Health System in Washington, D.C.
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The study also revealed that Zika can cause invisible damage to a fetus that could show up later, and that it made its way into developing muscle, liver, lung and the spleen.