Parasitic infections are caused by organisms that live and feed off other organisms, known as parasites. These parasites can be protozoa, helminths, or ectoparasites, and can infect humans, animals, and plants. Parasitic infections can cause a range of symptoms, including fever, fatigue, digestive issues, and skin rashes. These infections are typically transmitted through contaminated food or water, insect bites, or contact with infected individuals or animals. Treatment for parasitic infections often involves medications to kill the parasites and alleviate symptoms. Research in this area focuses on understanding the biology and life cycle of parasites, developing better diagnostic tools and treatments, studying the impact of parasitic infections on public health, and developing strategies for prevention and control of these infections.