Influenza in Pregnancy and Birth Outcomes in the Brazilian Semi-Arid: The INFLUEN-SA Study

Studies show that seasonal influ enza in Northeastern state of - Ceará occurs 2-3 months earlier than in the South and Southeast, where the national calendar of vaccination is based. The study will test if Brazil’s national policy targeting vaccination only in April and May inadequately protects against the harmful maternal-fetal effects of influenza in the Semi-Arid and northern regions.