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A parasitic disease, also referred to as parasitosis, is an communicable disease caused or transmitted by a parasite. Many parasites don't cause diseases because it may eventually cause death of both organism and host. Parasites infecting citizenry are called human parasites. Parasitic diseases can affect practically all living organisms, including plants and mammals. The study of parasitic diseases is named parasitology. Symptoms of parasites might not always be obvious. However, such symptoms may mimic anemia or a hormone deficiency. A number of the symptoms caused by several worm infestations can include itching affecting the anus or the vaginal area, abdominal pain, weight loss, increased appetite, bowel obstructions, diarrhea, and vomiting eventually resulting in dehydration, sleeping problems, worms present within the vomit or stools, anemia, aching muscles or joints, general malaise, allergies, fatigue, and nervousness. Symptoms can also be confused with pneumonia or gastrointestinal disorder. The consequences caused by parasitic diseases range from mild discomfort to death. The nematode parasites Necator americanus and Ancylostoma duodenale cause human hookworm infection, which results in anaemia, protein malnutrition and, in severely malnourished people, shortness of breath and weakness. This infection affects approximately 740 million people within the developing countries, including children and adults, of the tropics specifically in poor rural areas located in Sub-Saharan Africa , Latin America , Southeast Asia and China. Chronic hookworm in children results in impaired physical and intellectual development, school performance and attendance are reduced.      

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