How Does Zika Causes Birth DefectsThis is how the Zika virus causes severe and often horrific birth defects. Warning: Some images may be disturbing.Get more newsLiveonPrintAug. 23, 2016, 9:27 PM UTC / Updated Aug. 23, 2016, 9:27 PM UTCBy Kyle ScottKyle ScottKyle Scott is an Associate Producer with NBC News based in New York City.