Rapid risk assessment: Zika virus disease epidemic: potential association with microcephaly and Guillain–Barré syndrome, Second update

​This document assesses the risks associated with the Zika virus epidemic currently affecting countries in the Americas. It assesses the association between Zika virus infection and congenital central nervous system malformations, including microcephaly, as well as the association between Zika virus infection and the Guillain–Barré syndrome (GBS).