trypanosome

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Related to Trypanosomes: trypanosomiasis, malaria, Trypanosoma brucei

trypanosome

(trĭp`ənəsōm'), microscopic, one-celled protozoan of the genus Trypanosoma, typically living as an active parasite in the bloodstream of a vertebrate; hundreds of species are known. A trypanosome is long and pointed and possesses a flagellum. The flagellum arises at the front, or anterior, end of the parasite and curves back to form the edge of a long, undulating membrane used in locomotion. Trypanosomes have a complex life cycle; most species undergo part of their development in the digestive tract of insects, which spread the parasite by biting.

Many trypanosomes do not appear to harm their hosts, but a number of species cause serious diseases in humans or domestic animals (see trypanosomiasistrypanosomiasis
, infectious disease caused by a protozoan organism, the trypanosome, which exists as a parasite in the blood of a number of vertebrate hosts. The three variations of the disease that predominate in humans are transmitted by an insect vector.
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). T. brucei gambiense and T. brucei rhodesiense cause African sleeping sickness and are transmitted by tsetse fliestsetse fly
, name for any of several bloodsucking African flies of the genus Glossina, and in the same family as the housefly. The larva of the tsetse fly develops inside the body of the mother until it is ready to pupate in the soil.
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. T. cruzi is the cause of Chagas' diseaseChagas' disease,
disease of South and Central America caused by the parasite Trypanosoma cruzi. It usually affects children and young adults and is transmitted by the feces of infected insects, typically the assassin bug.
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, prevalent in South and Central America, which affects the nervous system and heart; it is transmitted by the bite of assassin bugsassassin bug,
common name for members of the family Reduviidae, one of the largest and most varied groups belonging to the order Hemiptera (suborder Heteroptera). Assassin bugs are generally brownish to black, medium-sized to large insects, with heads that are elongate and
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. Other species, restricted in distribution to Africa and Asia, cause diseases of horses and cattle. Control measures include elimination or reduction of the insect carrier populations and measures to reduce the likelihood of bites.

Trypanosomes are classified in the phylum Mastigophora of the kingdom ProtistaProtista
or Protoctista
, in the five-kingdom system of classification, a kingdom comprising a variety of unicellular and some simple multinuclear and multicellular eukaryotic organisms.
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.

trypanosome

[trə′pan·ə‚sōm]
(invertebrate zoology)
A flagellated protozoan of the genus Trypanosoma.
References in periodicals archive ?
Phenotypic characteristics and trypanosome prevalence of Mursi cattle breed in the Bodi and Mursi districts of South Omo Zone, southwest Ethiopia.
To tell which was which, individual trypanosomes were tagged with different colours, with the result that the hybrid cells had both colours.
Dithiol proteins as guardians of the intracellular redox milieu in parasites: Old and new drug targets in trypanosomes and malaria-causing plasmodia.
However the wet mount smear demonstrated 8-10 trypanosomes per high powered field (hpf), the thick prep showed between 010 organisms per hpf (see figure 1), and 0-1 per low powered field (lpf).
The ecotopes and evolution of triatomine bugs (triatominae) and their associated trypanosomes.
25) Ross was a confirmed devotee of the trusteeship doctrine, acknowledging the excesses of African partition (when the continent, in his terms, became the "territorial grab-bag of Europe"), yet concluding that the Scramble was merely an episodic side effect of the more noble project of conveying rapid social and economic development to Africa: "First-generation descendants of witch doctors and medicine men," he intoned, "[now] sit with trained and knowing eyes at the latest high-powered microscopes in scores of hospitals and laboratories, picking trypanosomes out of blood smears and determining which of a score of long-named intestinal parasites is troubling the patient.
The triatomines of Northern Peru, with emphasis on the ecology and infection by trypanosomes of Rhodnius ecuadoriensis (Triatominae).
Diminazene aceturate is an effective drug used in the treatment of trypanosomosis a disease caused by protozoan parasites known as trypanosomes.
The champions of disguise are trypanosomes, the single-celled parasites that cause diseases like sleeping sickness.
L'identification d'un secteur de prophylaxie donnait lieu a de nouvelles dispositions relatives a la pratique medicale, la circulation des personnes et au travail : surveillance du transit, examen des indigenes employes, interdiction de travail aux trypanosomes et aux << suspects, >> exemptions de corvees de prestation et d'impot pour certaines categories de malades.