TO THE EDITOR—Zika virus (ZIKV) has recently emerged as an important human pathogen because of its association with congenital defects including microcephaly and adult-onset Guillain-Barré syndrome [1]. In Brazil in 2015, an association was reported between ZIKV infection and an increased number of infants born with microcephaly in Zika-affected areas [1]. The virus has continued to spread in the Americas and by April 2017, 48 countries and territories in the region have reported transmission of ZIKV and 26 countries have reported congenital syndrome.