European Centre for Disease Prevention and Control (ECDC), 24 November 2015
The increase in congenital microcephaly observed in Brazil is of concern. Its emergence a few months after the introduction of Zika virus (ZIKV) infection into the country raises questions about the possible role of the infection in congenital microcephaly. There is currently only ecological evidence of an association between the two events. A possible causative nature of the association cannot be ruled out with the evidence available.