Three-month-old Ruslan suffers from CHD. He has already had open-heart surgery to correct his birth defects. Two-year-old Nadya has been diagnosed with hydrocephaly, a disorder characterized by a ...

But many Olympians and fans remain understandably worried about Zika, which has been linked to Guillain-Barré syndrome, a paralyzing nervous disorder, and birth defects such as microcephaly ...