Inclusion Criteria:  Adults < 55 years History of symptomatic COVID over 1 year +/- 4 months with a positive PCR diagnosis of SARS-CoV-2 Olfactory complaint Able to understand simple questionnaires in French. Subject covered by French Social Security (except for Aide Médicale d'Etat).  Exclusion Criteria:  Contraindication to nasal swabbing (for morphological reasons, haemostasis disorders, taking aspirin in the 15 days prior to swabbing or anticoagulants, contraindications to the use of a local anaesthetic such as a history of allergy to local anaesthetics or any other reasons judged by the clinical investigator) To have been placed in the intensive care unit following COVID-19. Known previous nasal-sinus pathology. History of psychiatric pathology according to DSM IV criteria, ischaemic, neoplastic, inflammatory, infectious or neurodegenerative (meningitis, encephalopathy, encephalitis, stroke, neurodegenerative disease) known or suspected. History of loss of sense of smell prior to COVID infection. Patient affiliated to the Aide Médicale d'Etat. Person deprived of liberty by judicial or administrative decision, or subject to legal protection.