A new analysis of data from the 2013-2014 Zika epidemic in French Polynesia by scientists from the Institut Pasteur, Paris, and their French Polynesian colleagues has confirmed the incidence of grouped cases of microcephaly and quantified the risk of microcephaly associated with the virus. Using innovative mathematical modeling techniques, their research shows that the risk of microcephaly is around 1% for a fetus or newborn whose mother has been infected by the Zika virus during the first trimester of pregnancy.
