Parasites Essay

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The parasitic creatures that live on, and inside, the human body are defined as an organism that lives on or in a host and gets its food from or at the expense of its host. They are put in three main categories of parasites that can cause disease in humans: protozoa, ectoparasites, and helminths. Protozoa are microscopic, one-celled organisms that can be free-living or parasitic in nature. They are able to multiply in humans, which causes serious infections to develop. The parasite inhabits the intestines of humans, cattle and many other animals, and it is typically spread through contaminated food and water or fecal-oral route from person to person. This includes the parasite, known as cryptosporidium, which caused the water-borne outbreaks in Milwaukee, WI. Over 100,000 people became ill and over 200 deaths occurred from complications. It was found that the municipal water system was how it traveled so fast. This was the largest outbreak ever recorded in the United States. Although the parasite is transmitted in water it does not grow in water and proper filtration is needed because it has grown resistant to chlorine. The protozoa that are infectious to humans can cause amebic dysentery, giardiasis, toxoplasmosis, and malaria. Malaria is a protozoon that lives in the blood or tissue of humans can be transmitted to other humans by an arthropod vector (for example, through the bite of a mosquito or sand fly also known as ectoparasites). Ectoparasites can broadly include blood-sucking arthropods such as mosquitoes (because they are dependent on a blood meal from a human host for their survival), this term is generally used more narrowly to refer to organisms such as ticks, fleas, lice, scabies, and mites that attach or burrow into the skin and remain there for relatively long periods of time (e.g., weeks to months). Arthropods are important in causing

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