 - Pregnant women will be enrolled in the registry prospectively after exposure to Quadrivalent Influenza Vaccine QIV but before the conduct of any prenatal tests that could provide knowledge of the outcome of pregnancy. If the condition of the fetus has already been assessed through prenatal testing e.g., targeted ultrasound, amniocentesis, etc., such reports will be considered retrospective reports. Retrospective reports are also eligible for the registry but they will be analyzed separately from prospective reports. 