The purpose of this article is to investigate the growing number of viral diseases, to gather information on what measures should be taken against them and to educate the population. The immunological structure of the population is formed due to increased insensitivity to pathogenic microorganisms, which occurs through the formation of natural immunity (inherited or acquired as a result of an infectious process) and artificial immunity (created through immunoprophylaxis). The level of the immunological structure of the population affects the direction (trend) of the epidemic process. The higher the AID for a particular infectious disease, the lower the incidence, as well as the risk of group illnesses or outbreaks Key words: immunology, prophylaxis, natural immunity, artificial immunity, vaccination, vaccine, acquired immunity, serum, foreign antigen, organism, hereditary, physiological feature, anatomical feature
