Abstract: | The structural organization and functioning of parasitic systems are considered in the context of the general theory of systems. By using the parasitic system of an epizootic process of plague as an example, the essence of the concepts of the structural organization and functioning of the systems is determined, and a scheme of a relationship of elements in the trinomial parasitic systems is presented. The mechanism of parasite-host interaction at the molecular, cellular, body's, and populational levels is considered on the basis of the theory of immune-specific wave information in an living organism. |