Although the symptoms of the virus have until now appeared benign, growing indications of a link to microcephaly and a rare neurological disorder called Guillain – Barre syndrome have stirred growing alarm. However, it couldn’t be confirmed whether the clusters of microcephaly and Guillain - Barre are caused by Zika on which Brazil was the first to sound the alarm in the current crisis, warning in October, that a rash of microcephaly cases had emerged in the northeast.