inclusion criteria: major patient patient with a sudden loss of smell> 5 weeks linked to a viral infection (including sars-cov-2) of the upper respiratory tract treated in the ent department of the chru nancy patient accepting olfactory rehabilitation patient presenting with hyposmia or anosmia (confirmed by the threshold and identification tests of the sniffin 'stick kit) patient affiliated to a social security scheme or beneficiary of such a scheme patient who has received full research information and signed an informed consent.

inclusion criteria: major patient patient with a sudden loss of smell> 5 weeks linked to a viral infection (including sars-cov-2) of the upper respiratory tract treated in the ent department of the chru nancy patient accepting olfactory rehabilitation patient presenting with hyposmia or anosmia (confirmed by the threshold and identification tests of the sniffin 'stick kit) patient affiliated to a social security scheme or beneficiary of such a scheme patient who has received full research information and signed an informed consent.