Inclusion Criteria:  Child born between March 2005 and July 2006 Of which the mother identified in the CHIMERE cohort or the perinatal register of maternities Exposed: child infected with the chikungunya virus at the time of childbirth Not exposed: child not infected with the chikungunya virus at the time of childbirth, verifying the matching criteria specified in chapter 5.2 Affiliated to a social insurance  Exclusion Criteria:  Prematurity <33 weeks Prenatal alcoholization authenticated by fetal alcohol syndrome Intellectual disability or secondary epilepsy of origin other than CHIKV infection (caused by ACSOS or any other cause of brain damage of inflammatory, metabolic or infectious origin)