Schistosoma


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Schistosoma

 [shis″-, skis″to-so´mah]
a genus of trematodes, including several species parasitic in the blood of humans and domestic animals. The organisms are called schistosomes or blood flukes. Larvae (cercariae) enter the body of the host by way of the digestive tract, or through the skin from contact with contaminated water, and migrate in the blood to small blood vessels of organs of the intestinal or urinary tract; they attach themselves to the blood vessel walls and mature and reproduce. The intermediate hosts are snails of various species.
The life cycle of Schistosoma. From Mahon and Manuselis, 2000.
Schistosoma haemato´bium a species endemic in North, Central, and West Africa and the Middle East; the organisms are found in the venules of the urinary bladder wall, and eggs may be isolated from the urine.
Schistosoma japo´nicum a species geographically confined to China, Japan, and nearby countries; found chiefly in the venules of the intestine.
Schistosoma manso´ni a species widely distributed in Africa and parts of South America; the organisms are found in the host's mesenteric veins, and eggs may be found in the feces.

Schistosoma

(skis'tō-sō'mă), Avoid the mispronunciation shis-tō-sō'ma.
A genus of digenetic trematodes, including the important blood flukes of humans and domestic animals, which cause schistosomiasis; characterized by elongate shape, by marked sexual dimorphism, by their unusual location in the smaller blood vessels of their host, and by use of water snails as intermediate hosts. Some of the avian schistosome species cause swimmer's itch or cercarial dermatitis in North America and elsewhere. Humans are incidental hosts, so parasites do not mature; causes skin irritation due to allergic reaction to the parasite.
[schisto- + G. sōma, body]

Schistosoma

Parasitology A genus of elongated sexually dimorphic trematodes, the blood flukes, of phylum Platyhelminthes, Class Trematoda, of which there are 3 major human pathogens: S hematobium, S japonicum, and S mansoni; Schistosoma spp infect ±200 million worldwide, kill 800,000/yr; morbidity is due to exuberant tissue reaction to the eggs–they don't replicate in humans. See Circumoval body, Pipestem fibrosis.

Schis·to·so·ma

(skis'tō-sō'mă)
A genus of trematodes, including the blood flukes that cause schistosomiasis; characterized by elongatation, marked sexual dimorphism, location of adults in the smaller blood vessels of their host, and use of water snails as intermediate hosts.
[G. schiston, split + G. sōma, body]

Schistosoma

(skĭs″tō-sō′mă) [″ + soma, body]
Enlarge picture
SCHISTOSOMA: Female (larger) and male (×5)
A genus of parasitic blood flukes belonging to the family Schistosomatidae, class Trematoda. See: illustration

Schistosoma haematobium

A species common in Africa and southwestern Asia. Adults infest the pelvic veins of the vesical plexus. Eggs work their way through the bladder wall of the host and are discharged in the urine. Urinary schistosomiasis is caused by this organism.

Schistosoma japonicum

A species common in many parts of Asia. Adults live principally in branches of the superior mesenteric vein. Eggs work their way through the intestinal wall of the host into the lumen and are discharged with feces. Oriental schistosomiasis is caused by this species.

Schistosoma mansoni

A species occurring in many parts of Africa and tropical America, including the West Indies. Adults live in branches of the inferior mesenteric veins. Eggs are discharged through either the host's intestine or bladder. This species causes bilharzial dysentery or Manson's intestinal schistosomiasis.

Bilharz,

T.M., German parasitologist, 1825-1862.
Bilharzia - schistosomiasis; tumorlike swelling of the skin due to infection by Schistosoma organism. Synonym(s): Schistosoma

Schis·to·so·ma

(skis'tō-sō'mă)
Genus of digenetic trematodes, which cause schistosomiasis.
[G. schiston, split + G. sōma, body]
References in periodicals archive ?
Schistosoma haematobium in Lake Malawi: susceptibility and molecular diversity of the snail hosts Bulinus globosus and B.
The first, called pilot test, was placed ten adult snails, negative for Schistosoma mansoni in each beaker containing 500 mL of a solution obtained from the dilution of the oil with distilled water and 0.15 mL of Tween 80 (surfactant) in the concentration of 100 mg x [L.sup.-1], obtaining at the end a proportion of 50 mL of solution for each snail and feeding them with hydroponic lettuce ad libittum (Malek 1985).
Long-term hepatocellular effects of hycanthone and two other anti-schistosomal drugs in mice infected with Schistosoma mansoni.
Identification of Schistosoma indicum egg in faeces and its therapeutic management using Fentas Plus (a) in a four month old female bovine calf is discussed.
The influence of transmission season on parasitological cure rates and intensity of infection after praziquantel treatment of Schistosoma haematobium-infected schoolchildren in Mozambique.
Diffuse interstitial pulmonary fibrosis and spontaneous pneumothorax associated with Schistosoma haematobium infestation of the lungs.
Since Treg cells play important roles in suppressing both Th1 and Th2 responses during Schistosoma infection [20, 21], we next examined whether Th1 and Th2 cells were regulated by pioglitazone treatment during S.
Vercruysse et al., "Circulating anodic and cathodic antigen in serum and urine of mixed Schistosoma haematobium and S.
Karyopherin alpha 2 (KPNA2) is associated with the natural resistance to Schistosoma japanicum infection in Microtus fortis.