Primary Cyst Wall

2016 ◽  
pp. 2250-2253
Author(s):  
Heinz Mehlhorn
Keyword(s):  
Cyst Wall ◽  
Primary Cyst

Sarcocystis wapiti sp. nov. from the North American wapiti (Cervus elaphus)

1982 ◽  
Vol 60 (5) ◽  
pp. 881-888 ◽  
Author(s):  
Clarence A. Speer ◽  
J. P. Dubey
Keyword(s):  
Small Intestine ◽  
Cervus Elaphus ◽  
Cyst Wall ◽  
Canis Latrans ◽  
Canis Familiaris ◽  
Domestic Cat ◽  
The North ◽  
Muscle Tissues ◽  
Infected Meat ◽  
Primary Cyst

Sarcocystis wapiti sp. nov. (Eimeriina: Sarcocystidae) is described as a heteroxenous coccidian with dogs (Canis familiaris) and coyotes (Canis latrans) as the final hosts and wapiti (Cervus elaphus) as the natural intermediate host. Sarcocysts in various muscle tissues of the wapiti were micro- to macroscopic, had a thin primary cyst wall and septa, and measured 652 × 322 μm. Sarcocysts contained numerous bradyzoites that were 16.1 × 2.4 μm and few metrocytes that were 11.2 × 4.6 μm. Ten days after ingesting Sarcocystis-infected wapiti meat, a dog and a coyote began passing oocysts and sporocysts in their feces; a domestic cat did not pass oocysts or sporocysts after ingesting infected meat from the same animal. Sporulated oocysts measured 20.3 × 15.6 μm; sporocysts were 15.9 × 10.6 μm. Twelve days after ingesting wapiti meat, oocysts of S. wapiti were found in the lamina propria of the distal one-third of the villi of the small intestine of the coyote. Bradyzoites were found in digests of muscle tissue of 58 of 65 wapiti.

Description of a species of Sarcocystis (Apicomplexa: Sarcocystidae), a parasite of the northern saw-whet owl, Aegolius acadicus, and experimental transmission to deer mice Peromyscus maniculatus

1988 ◽  
Vol 66 (10) ◽  
pp. 2118-2121 ◽  
Author(s):  
Rolando H. Espinosa ◽  
Mauritz C. Sterner ◽  
John A. Blixt ◽  
Richard J. Cawthorn
Keyword(s):  
Cyst Wall ◽  
Skeletal Muscles ◽  
Granular Layer ◽  
Peromyscus Maniculatus ◽  
Deer Mice ◽  
Thin Wall ◽  
Experimental Transmission ◽  
Aegolius Acadicus ◽  
Dose Levels ◽  
Primary Cyst

Sporocysts of Sarcocystis were recovered from the intestinal mucosa of a northern saw-whet owl (Aegolius acadicus). Sporocysts measured 12.0 × 9.7 μm (9.6–14.0 × 8.0–12.0 μm; n = 100). Doses of 0, 500, and 2500 sporocysts were administered orally to five deer mice (Peromyscus maniculatus) and five Swiss-Cox white mice (Mus musculus) At necropsy, 28 days postinoculation, deer mice administered 500 and 2500 sporocysts had sarcocysts in skeletal muscles and cardiac muscle. White mice were negative at all dose levels. Sarcocysts had a thin wall (< 1 μm) that consisted of a primary cyst wall and a coarse granular layer composed of 36.6 nm granules (25.6–51.2 nm; n = 11). Thickness of the primary cyst wall was 62.5 nm (38.4–116.1 nm; n = 10). Metrocytes were 2.3 × 1.7 μm (1.5–3.5 × 1.2–2.5 μm; n = 25). Bradyzoites were 5.2 × 1.1 μm (4–7 × 1–2 μm; n = 25).

Development and ultrastructure of the marine, parasitic oomycete, Lagenisma coscinodisci (Lagenidiales): encystment of primary zoospores

1978 ◽  
Vol 56 (11) ◽  
pp. 1309-1314 ◽  
Author(s):  
E. Schnepf ◽  
G. Deichgräber ◽  
G. Drebes
Keyword(s):  
Cyst Wall ◽  
Developmental Stages ◽  
Wall Layer ◽  
Dense Layer ◽  
Cytoskeletal Elements ◽  
Primary Cyst

The primary zoospores of Lagenisma contain many peripheral "encystment vesicles." They disappear when the primary cyst wall is formed. The primary cyst wall consists of a 6-nm-thick, electron-dense layer and is secreted in less than 1 s. Ten seconds later, the flagella are retracted in the "straight-in way" within 3–4 s. The cyst bears spines which initially are filled with cytoplasm. They do not seem to contain cytoskeletal elements and possibly are shaped by a locally restricted extension of the cytoplasm and the cyst wall when the latter is formed. Later on, a secondary, inner, thicker fibrillar cyst wall layer is secreted. In contrast with other developmental stages studied hitherto, the vegetative primary cyst contains microbody-like structures.

Developmental changes in the tegument of four microphallid metacercariae in their second (crustacean) intermediate hosts

1996 ◽  
Vol 70 (3) ◽  
pp. 201-210 ◽  
Author(s):  
K.V. Galaktionov ◽  
I.I. Malkova ◽  
S.W.B. Irwin ◽  
D.H. Saville ◽  
J.G. Maguire
Keyword(s):  
Cyst Wall ◽  
Growth And Development ◽  
Secretory Granules ◽  
Developmental Changes ◽  
Intermediate Hosts ◽  
Cyst Production ◽  
Developed Surface ◽  
Parenchymal Cells ◽  
Progressive Accumulation ◽  
Primary Cyst

AbstractThe morphology of the tegument of four microphallid metacercariae from the stage of invasive cercariae to their maturation as encysted metacercariae inside their crustacean second intermediate hosts is described. The tegument of the metacercariae developed surface lamellae and projections which, along with coated vesicles in the surface syncytium, indicated that the tegument had an absorptive function. The disappearance of secretory granules from the tegument at the same time as the appearance of the first cyst wall suggested that the tegument had a role in primary cyst production. Following this, the metacercariae continued to grow and seemingly retained their absorptive ability. The tegument was also involved in the transport of material into the perimetacercarial lumen prior to its eventual inclusion in the developing inner cyst layers. It appeared that this material originated in tegumental cells located amongst the parenchymal cells beneath the tegumental syncytial layer. On completion of the secondary cyst layers there was a gradual degeneration of structures associated with absorption and a progressive accumulation of dense discoid granules traceable to underlying tegumental cells. All four microphallid species (Maritrema arenaria,M. subdolum,Levinseniella brachysomaandMicrophallus claviformis) demonstrated the same developmental pattern but the period spent in each stage differed depending on the time spent migrating to encystment sites. The pattern of tegumental development described is thought to be applicable to all microphallid metacercariae and possibly to other metacercariae which undergo growth and development in their second intermediate hosts.

Occurrence of Sarcocystis Lankester, 1882, in wild geese in Saskatchewan

1981 ◽  
Vol 59 (8) ◽  
pp. 1621-1624 ◽  
Author(s):  
G. Wobeser ◽  
F. A. Leighton ◽  
R. J. Cawthorn
Keyword(s):  
Skeletal Muscle ◽  
Cyst Wall ◽  
The Other ◽  
Canada Geese ◽  
Snow Goose ◽  
Snow Geese ◽  
Lesser Snow Geese ◽  
Anser Caerulescens Caerulescens ◽  
Lesser Snow Goose ◽  
Primary Cyst

Skeletal and cardiac muscle from wild geese dead of avian cholera was examined for Sarcocystis sp. infection. Microscopic cysts of Sarcocystis sp. were found in skeletal muscle of 42 of 88 Lesser Snow Geese, Anser caerulescens caerulescens, 1 of 7 Ross Geese, Anser rossi, and 1 of 3 Canada Geese, Branta canadensis, collected during April and May in central Saskatchewan. Two types of microcysts were present in skeletal muscle; one type had finger-like protrusions on the primary cyst wall; the other had a relatively smooth primary cyst wall. Both types were found in one Lesser Snow Goose. Microscopic cysts were found in the heart of 8 of 150 Lesser Snow Geese and 3 of 35 Ross Geese. All cysts in the myocardium had a smooth primary cyst wall.

First molecular characterization and morphological aspects of Sarcocystis fusiformis infecting water buffalo Bubalus bubalis in Egypt

2018 ◽  
Vol 63 (2) ◽  
pp. 333-345 ◽  
Author(s):  
Kareem Morsy ◽  
Fathy Abdel-Ghaffar ◽  
Saad Bin Dajem ◽  
Rewaida Abdel-Gaber ◽  
Fatma El Gazar
Keyword(s):  
Cyst Wall ◽  
Water Buffalo ◽  
Sequence Data ◽  
Molecular Study ◽  
Bubalus Bubalis ◽  
18S Rrna Gene ◽  
Ground Substance ◽  
Rrna Gene ◽  
Primary Cyst ◽  
Sarcocystis Fusiformis

AbstractFresh muscle samples from water buffalo (Bubalus bubalis) aged 2–15, from Giza Province, Egypt; were examined forSarcocystisinfection. Macroscopic ovoid sarcocysts embedded in the muscle tissues of the examined buffaloes were detected; they measured 152–230 (210 ± 7) μm in length and 37–119 (95 ± 3) μm in width. The esophagus was the most infected organ followed by the diaphragm, and tongue, while the heart muscles were the least infected. The cyst cavity was compartmentalized by septa derived from the ground substance located under the primary cyst wall. Using transmission electron microscopy, the primary cyst wall bordered sarcocysts were determined to be 0.08–0.22 μm in thickness, raised from the parasitophorous vacuolar membrane, and surrounded by a secondary cyst wall of host origin. The primary cyst wall had irregular wall folds with numerous cauliflower-like projections of variable sizes and shapes accompanied by knob-like electron-dense elevations. 18S rRNA gene expression studies confirmed that the present parasite isolates belonged to the genusSarcocystis. The sequence data showed significant identities (>90%) with archived gene sequences from many Eimeriidae organisms, and a dendogram showing the phylogenetic relationship was constructed. The most closely related species wasSarcocystis fusiformisKR186117, with an identity percentage of 98%. The recovered sequences were deposited in the GenBank under the accession number MG572125. The present study, to our knowledge, is the first collective ultrastructural and molecular study that confirmed the taxonomy of sarcocysts isolated from water buffaloes in Egypt asSarcocystis fusiformis.

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