Protozoal and Parasitic Diseases Toxoplasmosis. Toxoplasmosis is a protozoal disease caused by the sporozoan Toxoplasma gondii. This protozoan is transmitted from domestic house cats , usually by contact with their urine or feces. In humans, the protozoa multiply in the bloodstream and undergo a complex reproductive cycle. Patients experience fever, with other constitutional abnormalities, but symptoms are generally mild. However, in a pregnant woman , the protozoa may pass to the unborn fetus and cause tissue destruction. Also, in AIDS patients, toxoplasmosis can result in seizures and then brain inflammation, and it may be a cause of death. Malaria. Malaria is a blood disease due to many species of the genus Plasmodium. Plasmodia are a group of protozoa of the Sporozoa (Apicomplexa) group. The parasites are transmitted by mosquitoes belonging to the genus
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