Olfactory dysfunction is a defining symptom of COVID-19 infection. Studies have demonstrated improved olfaction in patients with post infectious olfactory dysfunction after an olfactory training (OT). The aim of this study is to assess the clinical outcomes of olfactory training (12 weeks) therapy in the treatment of persistent olfactory dysfunctions after COVID-19. Specially, we aim to compare the effectiveness of two different olfactory training (different odors). A group will train themselves with 4 scents (rose, orange, clove and eucalyptus) and another group with 4 different scents (cheese, coffee, strawberries and lemon). Olfaction sensory evaluation will be performed by using different olfaction tests (Sniffin' Sticks and UPSIT) and complete questionnaires to assess olfactory perception and particularly parosmia and phantosmia.
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Changes from baseline in olfactory score on the University of Pennsylvania Identification Test (UPSIT) [ Time Frame: Measurement will be taken at time zero (pre-intervention) and 12 weeks (post-intervention)
Timeframe: Measurement will be taken at time zero (pre-intervention) and 12 weeks (post-intervention)
Changes from baseline in olfactory score on the Sniffin's Sticks test
Timeframe: Measurement will be taken at time zero (pre-intervention) and 12 weeks (post-intervention)
n-house test for chemosensory dysfunction (TMSC)
Timeframe: Measurement will be taken at time zero (pre-intervention) and 12 weeks (post-intervention)
Parosmia and phantosmia assessment test
Timeframe: Measurement will be taken at time zero (pre-intervention) and 12 weeks (post-intervention)
The abridged version of the Questionnaire of Olfactory Disorders - Negative Statements (sQOD-NS)
Timeframe: Measurement will be taken at time zero (pre-intervention) and 12 weeks (post-intervention)