Homologies and Analogies Between Free-Living and Parasitic Protozoa

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Abstract
A comparison is made between free-living and parasitic protozoa, showing that the same principles govern both types as regards morphology, physiological processes, life cycles and their relations to their physical and biological environments. The free-living Amoeba proteus is compared with the parasitic Endamoeba coli as to morphology, food and food selection, physiological processes, habitats, reproduction, and geographical distribution. Tissue invasion, symptoms, acquired resistance, latency and relapse, host-parasite specificity and habitat restrictions, and control are discussed. It is concluded that there are no fundamental differences between free-living and parasitic protozoa.

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