Chagas Disease. The cysts of E. histolytica have been found in the droppings of cockroaches which also serve as a source of infection. Treatment also depends on whether the protozoa is drug resistant. Malaria is a deadly disease and is transmitted to humans by the female mosquito. These organisms can be classified as parasitic or free-living. Andy Miller, MD, is board-certified in infectious disease and internal medicine. The parasites multiply by endodyogeny but under certain conditions large cysts are also formed. A toxic substance, the haemozoin, released by the parasite causes malaria. Unlike other pathogens, samples with protozoa cannot be simply identified through a culture. Consequently the patient may complain of persistent looseness of bowels. T. b. gambiense has a lower burden of protozoa in the blood so blood microscopy is usually unable to identify it, but microscopic examination of a lymph node biopsy (posterior lymph node) is more likely to identify the infection.. Protozoa make humans sick when they become human parasites. Transmission of parasite is always during sexual intercourse by male members who act as intermediaries. This fungus … Diarrhoea 3. Centers of Disease Control and Prevention. Both the above species of Trypanosoma are confined to those parts of Africa where tsetse flies, their vectors, are found. Parasitic protozoa are found in organisms such as ticks, flies and mosquitoes. Malaria not only causes millions of deaths annually in the tropics but it also prevents the cultivation of the most fertile regions of the earth. The disease is most widespread in the developing world and is one of the leading causes of mortality from parasitic disease worldwide. List of 8 Common Infectious Diseases in Humans. Answer Now and help others. Giardia infection is an intestinal infection marked by abdominal cramps, bloating, nausea and bouts of watery diarrhea. Various drugs which are now used for the treatment of malaria include Quinine, Camoquine, Chloroquine, Plasmoquine, Resochin, Pentaquine, Pamaquine, Paludrine, etc. It causes Chagas’ disease or American trypanosomiasis in South and Central America. Balantidial dysentery is caused by a ciliate parasite, Balantidium coli. Other eukaryotes include: Protozoa are found everywhere. Symptoms of the disease are … Protozoa that live in the intestines usually cause digestive system disorders including abdominal pain and diarrhea. Giardia infection (giardiasis) is one of the most common causes of waterborne disease in the United States. The most important disease is leishmaniasis, which affects a large number of humans and for which nonhuman primates serve as an important animal model. 2014;4(2):95–111. For example, mosquitoes are vectors of plasmodium, the cause of malaria. Infection occurring in early months of pregnancy results either in abortion or still birth of the foetus. Metronidazole has also been reported to be quite effective in its treatment. MEMORY METER. Protozoan diseases. Suramin and Pentamidine are considered to be the drugs of choice for early and acute infection. Amoebiasis, also known as amoebic dysentery, is caused by Entamoeba histolytica. Toxoplasmosis can be identified in a number of different ways depending on where it's causing an infection, including: Giardia can be found through an antigen test of the stool and also by looking at the stool under a microscope. In kala-azar the parasite attacks the endothelial cells, bone marrow, liver, lymph glands and blood vessels of the spleen.