CHILDREN  Inclusion Criteria for children:  Any child aged 9 to 17 years presenting to one of the hospital departments participating in the study at the University Hospitals of Martinique or Guadeloupe Need to take a blood sample or place a peripheral venous line for the management of the child Residence in Martinique or Guadeloupe since at least one year Information on the study given to the child and his/her parent or legal guardian Collection of the parent's or legal guardian's non-objection to the child's participation  Exclusion Criteria for children:  Presence of fever or suspected acute infection Presence of an immune deficiency or any other dysimmune condition  PARENTS  Parental inclusion criteria ("vaccine acceptability" survey)  Collection of the parent's or legal guardian's non-objection to participate in the Dengvaxia® vaccine acceptability survey Comprehension of spoken and written French  Non-inclusion criteria for parents (vaccine acceptability survey)  - None of the above