Study of the Evolution of Olfactory Disorders in Patients With Persistent Loss of Smell Following COVID-19

The investigator will conduct a clinical examination to rule out other causes of olfactory impairment independent of COVID-19. The investigator will also collect the following information: socio-demographic data (age, sex, blood type, weight, height, etc.), history of olfaction disorder symptoms, past or current treatments received and tobacco/alcohol consumption.

12ml-blood sample

Olfactory evoked potentials will be recorded during olfactory tests.

collection of olfactory slits cells.

"* MOCA, BREF~* CVLT~* WAIS IV, MEM III~* Right-side and left-side empan, Trail Making Test A and B (TMT), verbal fluency tests, PASAT, Attention Assessment Test~* Benton's Line Judgement, VOSP~* Assessment of psychological status, fatigue and screening for psychiatric comorbidities: depression \& anxiety scales (HAD scale, mADRS depression scale, STAI anxiety scale), Fatigue Severity Scale."

Nasal endoscopy

"* scales: VAS and TSS~* Sniffin Stick test"