[A system of simulation models of the epidemic process based on a socioecological concept]

In this paper different methods of modeling the epidemic process for different types of infectious diseases are discussed. We propose a concept of modeling for an essentially nonhomogeneous human population, taking into account biological, ecological and social factors. The method of an "epidemiological tree" has been developed, which makes it possible to divide the population into so-called "epidemiologically active groups". The method is invariant with respect to nosological forms. The paths of the spread of an infectious disease among the population are described in the form of the oriented graphic presentation of the interaction of individual epidemiologically active groups. The dynamic characteristics of the epidemic process are calculated by means of the system of differential equations. For illustration, the proposed approach is applied to HIV infection used as an example.