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| A small, ovoid, nonflagellated form of the order Kinetoplastid flagellata. Notable structures include a mitochondrial kinetoplast and a large nucleus. Also called L.D. (Leishman-Donovan) body or leishmanial form. |
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| A phylum containing protozoa whose life cycle includes feeding stages (trophs), asexual multiplication (schizogony) and sexual multiplication ( gametogony and sporogony). |
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| An organism having a hard segmented exoskeleton and paired, jointed legs. |
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| Slowly multiplying intracellular trophozoites of Toxoplasma gondii; intracellular tissue cysts in immune host contain bradyzoites that continue dividing within the cyst. Bradyzoites are also found in sarcocysts. |
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| The stage of Plasmodium spp. that develops in liver cells from the inoculated sporozoites. Also called the exoerythrocyte stage or the tissue stage. |
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| A flattened, spindle-shaped, flagellated form seen primarily in the gut (e.g. in the reduviid bug) or salivary glands (e.g. in the tsetse fly) of the insect vectors in the life cycle of trypanosomes; it has an undulating membrane that extends from the flagellum (attached along the anterior half of the organism) to the small kinetoplast located just anteriorly to the larger nucleus located at the midpoint of the organism. |
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| Transformation from a cyst to a trophozoite after the cystic form has been swallowed by the host. |
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| The process whereby a sporozoan microgametocyte releases haploid flagellated microgametes that can fertilize a macrogamete and thus form a diploid zygote (ookinete). |
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| A sex cell that can produce gametes. |
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| The phase of the development cycle of the malarial and coccidial parasite in the human in which male and female gametocytes are formed. |
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| A long-surviving modified liver schizont of P. vivax that is the source of relapsing infections of this species. |
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Term
L.D. body
(Leishman-Donovan body) |
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Definition
| Each of the small ovoid amstigote forms found in tissue macrophages of the liver and spleen in patients with Leishmania donovani infection. |
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| Asexual multiplication in coccidian life cycle. Usually occurs in intestinal epithelium. |
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| Each of the many trophozoites released from human red blood cells or liver cells at maturation of the asexual cycle of malaria. |
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| The encysted form of the ookinete that occurs on the stomach wall of Anopheles spp. mosquitoes infected with malaria. |
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| The motile zygote of Plasmodium spp; formed by microgamete (male sex cell) fertilization of a macrogamete (female sex cell). The ookinete encysts. |
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Definition
| The fever-chills syndrome in malaria. Spiking fever corresponds to the release of merozoites and toxic materials from the rupturing parasitized red blood cells, and shaking chills occur during subsequent schizont development. occurs in malaria cyclically every 36 to 72 hours, depending on the species. |
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| A flagellate form of trypanosoma in which the kinetoplast is located at the anterior end of the organism; has no undulating membrane. This form is seen in the midgut and pharynx of vectors in the life cycle of the leishmania parasites and is the form that develops in culture media in vitro. |
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Definition
| A condition that may be seen in any malarial infection; infected red blood cells and accompanying symptoms reappear after a period of apparent "cure". This situation reflects and inadequate immune response by the host or an inadequate response to treatment. |
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Definition
| A condition seen subsequent to apparent elimination of the parasite from red blood cells; caused by a reactivation of sequestered liver merozoites that begin a new cycle in red blood cells. True relapses occur only in Plasmodium vivax and P. ovale infections. |
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Definition
| Infective cyst containing banana-shaped bradyzoites. |
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Definition
| Asexual multiplication of Apicomplexa; multiple intracellular nuclear divisions precede cytoplasmic division. |
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Definition
| The developed stage of asexual division of the Sporozoa (e.g. Plasmodium spp. in a human red blood cell; Isospora belli in the intestinal wall). |
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Definition
The fertilized oocyst in which the sporozoites of Plasmodium have developed.
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Definition
| Sexual reproduction of Apicomplexa. Production of spores and sporozoites. |
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| The form of Plasmodium that develops inside the sporocyst, invades the salivary glands of the mosquito, and is transmitted to humans. |
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| Rapidly growing intracellular trophozoites of Toxoplama gondii. |
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| A flagellate form with kinetoplast located at the posterior end of the organism and the undulating membrane extending along the entire body from the flagellum (anterior end) to the posterior end at the blepharoplast. This form is seen in the blood of humans with trypanosomiasis and is the infectie stage transmitted by the insect vectors. |
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| Infections with Trypanosoma cruzi may be diagnosed by allowing a uninfected Triatoma bug to feed on the patient (the bite is painless); the insect's feces are later examined for parasites (trypomastigote forms) |
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| The fertilized cell resulting from the union of male and female gametes. |
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