[The penetration of Sporozoa into host cells].

The analysis of morphological and functional peculiarities of sporo- and merozoites as disseminative stages of the sporozoan life-cycle is given. Penetration of parasites into the host's cells is a complex multistepped process very similar to the induced but not completed phagocytosis. As a result of that process the formation of the integrated cell system, which consists of the host's cell and the unicellular parasite takes place.