Diseases caused by parasitic protozoa basically involve two parasitism sites: the blood it's the digestive tract. However, the skin, the heart, the organs of the genital system, and the lymphatic system are also places where parasites can settle. These diseases involve hosts in their cycle, that is, living organisms in which parasites thrive.
If the parasitic agent uses two hosts to complete its life cycle, the place in which the parasite reproduces sexually is considered the definitive host. Intermediate host is one in which the parasite reproduces asexually.
Almost always man acts as the ultimate host; In malaria, however, the sexual reproduction of the parasites occurs in the mosquitoes, which are then considered definitive hosts, with man as the intermediate host.
Most common parasites in Brazil caused by protozoa: