The virus is linked to an alarming spike in babies born with abnormally small heads -- a condition called microcephaly -- in Brazil and French Polynesia.
Reports of a serious neurological condition, called Guillain-Barre Syndrome, that can lead to paralysis, have also risen in areas where the virus has been reported. Health officials have specifically seen clusters of this in El Salvador, Brazil and French Polynesia, according to WHO's Dr. Bruce Aylward.
