“…Throughout the entire life -from birth to death, the human body is exposed to the effect of negative factors, in particular, pathogenic microorganisms and damaging environmental factors [6,[16][17][18][19]. The first ones to fight the foreign agents are structures of the innate (nonspecific) immunity, socalled anatomical and physiological barriers of the immune system, such as integrity of skin and mucous membranes; mucus and glycocalyx, lysozyme, fatty acids; the acidity of gastric juice and urine; microbiota; mechanical removal of the pathogen (ciliated airway epithelium, cough, sneezing, vomiting, diarrhea, saliva, tears, sweat) [6,14,17].…”