* Exposed group (GE)  Inclusion Criteria:  presenting a symptomatic dengue fever, confirmed biologically between the presumed date of conception (date determined after the first trimester dating ultrasound) and the date of delivery.  Non inclusion Criteria:  not presenting biologically confirmed dengue fever;  with asymptomatic dengue fever between the presumed date of conception and the date of delivery.  Unexposed group with fever (GNEF)  Inclusion Criteria:  presenting an infectious syndrome not due to the dengue virus between the presumed date of conception (date determined after the ultrasound dating of the first trimester) and the date of delivery.  Non inclusion Criteria:  presenting with an infectious syndrome in the context of rubella (before 18 weeks), chickenpox, malaria, listeriosis, toxoplasmosis, primary HIV infection and CMV infection.  Exclusion Criteria:  Person included in the study with biologically confirmed dengue fever (symptomatic or not) between the date of inclusion and the date of delivery.  Unexposed group without fever or dengue (GNES)  Inclusion Criteria:  Having neither fever (above 38.5 ° C for more than 48 hours) nor dengue confirmed biologically (symptomatic or not) since the beginning of pregnancy.  Non inclusion criteria:  Having presented a febrile syndrome (fever above 38.5 ° C for more than 48 hours) or dengue fever confirmed biologically (symptomatic or not) since the beginning of pregnancy.  Exclusion criteria:  People included in the study,  with biologically confirmed dengue fever (symptomatic or not) between the date of inclusion and the date of delivery; having presented a febrile syndrome (fever above 38.5 ° C for more than 48 hours) between inclusion and childbirth.