Inclusion Criteria:  Patient with an indication to perform a COVID diagnostic test (symptomatology, contact case, systematic screening etc...) Men and women at least 3 years old  Exclusion Criteria:  Refusal of the patient or his legal representative, Taking treatments that reduce salivary volume (anticholinergic activity) Impossibility to perform the nasopharyngeal test Patient under guardianship or curatorship, persons placed under protective measures