Inclusion Criteria:  Healthy individuals Age 18-80 Have not been diagnosed with SARS-COV-2 infection (lack of positive PCR test) Have not been vaccinated against SARS-COV-2 infection  Exclusion Criteria:  Pregnancy Serious allergic or anaphylactic reactions to medications Allergies to milk products Ear-nose-throat pathologies (anatomic and diseases) Immunodeficiency conditions (cancers, hematologic diseases, HIV, congenital immunodeficiency) Viral hepatitis A,B and C Upper airway infections Autoimmune diseases (diabetes, COPD, asthma, rhinitis, RA, psoriasis) Concomitant drugs - glucocorticosteroids, biologic drugs, inhalable medications