Symbiosis and parasitism -- Parasite-host interactions -- General characteristics of the protozoa -- Visceral protozoa 1: amoebae and ciliates -- Visceral protozoa 2: flagellates -- Blood and tissue protozoa 1: hemoflagellates -- Blood and tissue protozoa 2: human malaria -- Blood and tissue protozoa 3: other apicomplexans -- General characteristics of the trematoda -- Visceral flukes -- Blood flukes -- General characteristics of the cestoidea -- Intestinal tapeworms -- Extraintestinal tapeworms -- General characteristics of the nematoda -- Intestinal nematodes -- Blood and tissue nematodes -- Arthropods as vectors.