Immunity to Yellow Fever in HIV-infected Patients 10 Years After a Primary Anti-yellow Fever Vaccination

Inclusion Criteria: * Subjects included in the ANRS EP 46 NOVAA trial: * 40 HIV positive subjects from consultations for infectious diseases and travel medicine centers at Saint-Louis, Cochin-Pasteur and Bichat hospitals (on HAART for at least one year and not modified in the 3 months preceding the pre-inclusion visit, CD4 \> 350/mm3 and a viral load \<50 copies / mL for at least 6 months). * 20 HIV negative subjects from the consultation of travelers from Saint-Louis, Bichat and Cochin-Pasteur hospitals. * Subjects agreeing to be monitored according to the terms of the protocol. * Subjects affiliated to a Social Security scheme or beneficiaries of such a scheme. * Signature of informed consent. Exclusion Criteria: * Non-volunteers for the 10-year follow-up * Subject under curatorship, guardianship or safeguard of justice.