Table 1.

Inclusion and exclusion criteria.

Inclusion criteria	Exclusion criteria
Age ≥ 18 years Written informed consent Healthy or respiratory symptoms <24 h	Ongoing therapy with antimicrobial, antiviral, or immune-suppressive substances
	Atopy or bronchial asthma requiring medical therapy
	Bronchopulmonary dysplasia
	Chronic obstructive pulmonary disease
	Cystic fibrosis
	Immunological and degenerative disorders (autoimmune diseases, leukemia, lymphoma, myeloma, AIDS)
	Diabetes mellitus
	Chronic liver disease
	Chronic renal insufficiency
	Serious health conditions with reduced state of health or autoimmune or oncological illness
	Known allergies to plants of the Compositae family or to one of the excipients of the treatment
	Planned or recent surgery 3 months