A study conducted in pregnant women and their unborn children during the Zika epidemic in the French territories in the Americas, permitted researchers from Inserm, Institut Pasteur and the University Hospital of Guadeloupe to accurately estimate the risk of severe neurological complications in babies. They have also determined that the first trimester of pregnancy is the period with the highest risk. While the overall risk is 7%, this rises to 12.7% – i.e. more than 1 in 10 children – if infection occurs during the first 3 months of pregnancy. Published in the New England Journal of Medicine.