Organism obtaining nourishment from or living one another organism (the 'host') for survival and usually harming it and causing disease. Some parasites are independent and some depend entirely on their hosts and separate only when either one of them dies. Human parasites include bacteria, fungi, lice, viruses, and worms. See also symbiosis.
1-(Parasite) A parasite is an organism that lives on or in a host organism and gets its food from or at the expense of its host. There are three main classes of parasites that can cause disease in humans: protozoa, helminths, and ectoparasites.
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