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  1. Dictionary
    parasite
    /ˈparəsʌɪt/

    noun

    • 1. an organism that lives in or on an organism of another species (its host) and benefits by deriving nutrients at the other's expense: "the parasite attaches itself to the mouths of fishes"
    • 2. a person who habitually relies on or exploits others and gives nothing in return: derogatory "he was a parasite who lived off other people"

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  2. en.wikipedia.org › wiki › ParasitismParasitism - Wikipedia

    1 day ago · Parasitism is a close relationship between species, where one organism, the parasite, lives on or inside another organism, the host, causing it some harm, and is adapted structurally to this way of life. [1] . The entomologist E. O. Wilson characterised parasites as "predators that eat prey in units of less than one". [2] .

  3. www.britannica.com › science › parasitismParasitism | Definition & Examples | Britannica

    Sep 26, 2024 · Parasitism is a relationship between two species of plants or animals in which one benefits at the expense of the other. Learn about different forms of parasitism, such as ectoparasites, endoparasites, brood parasitism, sexual parasitism, and parasitoids.

    • The Editors of Encyclopaedia Britannica

  4. biologynotesonline.com › category › microbiologyParasitology - Biology Notes Online

    4 days ago · Parasitology is the branch of biology that studies parasites, their hosts, and the interactions between them. It encompasses various aspects, including: Types of Parasites: Parasitology examines different kinds of parasites, such as protozoa (single-celled organisms), helminths (worms), and ectoparasites (like fleas and ticks). Host-Parasite Interactions: This field investigates how parasites interact with their hosts, including the effects of parasitism on host health, behavior, and ecology ...

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  6. www.cdc.gov › parasites › aboutAbout Parasites | Parasites | CDC - Centers for Disease ...

    Sep 11, 2024 · 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.

  7. microbe-investigations.com › difference-betweenParasite vs Bacteria: Key Differences Explained

    6 days ago · Parasites are unicellular, such as protozoa, or multicellular, such as helminths. A parasite consumes nutrients from its host, and usually, a host is damaged in the process, whereas Bacteria are prokaryotic, unicellular microorganisms that are sometimes free-living or sometimes infectious to hosts.

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  9. www.who.int › news-room › fact-sheetsVector-borne diseases - World Health Organization (WHO)

    Sep 26, 2024 · Vector-borne diseases are human illnesses caused by parasites, viruses and bacteria that are transmitted by vectors. Every year there are more than 700 000 deaths from diseases such as malaria, dengue, schistosomiasis, human African trypanosomiasis, leishmaniasis, Chagas disease, yellow fever, Japanese encephalitis and onchocerciasis.

  10. www.britannica.com › science › diseaseDisease - Host-Parasite, Pathogens, Immunity | Britannica

    Sep 17, 2024 · The genetic information that directs the synthesis of virus materials and certain enzymes enters the host cell, parasitizes its chemical processes, and directs them toward the synthesis of new virus elements. These various degrees of parasitism suggest that the host-parasite relationship is subject to continuing evolutionary change.