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Definition
| a relationship between two or more organisms |
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| a relationship between two or more organisms, each organism benefits from the relationship |
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| a relationship between two or more organisms, one organism benefits while another is not harmed from the relationship |
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| a relationship between two or more organisms, one organism benefits while another is harmed from the relationship |
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Definition
| a parasite living on the surface of its host |
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| a parasite living within its host. two types: intracellular (inhabits host cells), intercellular (inhabits extracellular spaces in host) |
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| (parasitic protists) single-celled eukaryotic organisms, usually have an organelle for movement, can be anaerobic or aerobic, energy for life provided by the host (ex. Giardia lamblia, Entamoeba histolytica, Cryptosporidium hominus, Balantidium coli, genus Plasmodium, Toxoplasma gondii, Trypanosoma brucei, Trichomonas vaginalis, Trypanosoma cruzi, ...) |
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Definition
| (parasitic worms) eukaryotic worm-like organisms that live and feed off living hosts, receiving nourishment and protection while disrupting their hosts' nutrient absorption, causing weakness and disease (ex. Nematodes (roundworms), trematodes (non-segmented flatworms and flukes), cestodes (segmented tapeworms) |
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Definition
| invertebrates with segmented bodies and jointed limbs that need hosts to survive, can be disease causing themselves (ex. tick paralysis) or a vector for pathogens |
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| a host harboring the sexual stage of a parasite (ex. genus Trichinella roundworm [causes trichinosis] in humans, genus Plasmodium [causes malaria in humans] in mosquitoes) |
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| a host harboring transition periods of a parasite (ex. Trypanosoma brucei protozoan [causes sleeping sickness] in humans) |
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| a host not needed for parasite life cycle to continue (ex. Alaria americana trematodes in tadpoles) |
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Definition
| a host preventing the life-cycle continuation of a parasite (ex. canine tapeworms [genus Echinococcus] in humans) |
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Definition
| a host harboring a parasite, usually the source of infections |
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| organism (usually an arthropod) transmitting pathogens from reservoir host to a new host (ex. tsetse flies are vectors for Trypanosoma brucei protozoan, Genus Anopheles mosquitoes are vectors for genus Plasmodium protists, sand flies are vectors for genus Leishmania protozoans) |
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Term
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Definition
| flagellated (has 8 flagella) parasitic protist (protozoan) causing giardiasis (beaver fever) in humans; resevoir host - beavers; common outbreaks occur in day cares or unsanitary water conditions (fecal-oral routes); organism attaches to and flattens villi in small intestine causing nutrient deficiency (of fats and b-vitamins), diarrhea followed by constipation, steatorrhea; can be deadly in immunocompromised individuals; each quadranuclear cyst produces two trophozoites (containing two nuclei each); can be treated with metronidazole |
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