Ultrastructure of Sarcocystis tenella (Sarcocystis ovicanis)

Vlemmas, I.; Kanakoudis, G.; Tsangaris, T.; Theodorides, I.; Kaldrymidou, E.

doi:10.1016/0304-4017(89)90130-1

Cited by 9 publications

(11 citation statements)

References 8 publications

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“…in different species of animals. In these studies, the characteristic extensions of the primary cyst walls and septums inside the cyst were observed (4,21). In our study, similar features were seen.…”

Section: Discussionsupporting

confidence: 86%

Meningoencephalitis caused by pathogenic Sarcocystis species in a naturally infected sheep in Turkey

Alasonyalilar-Demirer

Kahraman²,

Akkoç³

et al. 2017

Tierarztl Prax Ausg G

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A 3-year-old sheep was examined after an acute onset of hind limb paralysis and ataxia. At necropsy, central nervous system, pulmonary and intestinal hyperaemia and ecchymoses in the aortic arch were observed. Main microscopic lesions were confined to the heart, cerebrum and cerebellum. There were a multifocal mild myocarditis and nonsuppurative meningoencephalitis together with protozoal cysts in the heart and the brain. Protozoal cystic structures were observed within many of the myocardial fibers as well as in the cerebrum and cerebellum. Using light microscopy it could not be morphologically determined whether these organisms were Toxoplasma (T.) gondii or Neospora (N.) caninum. Additional diagnostic methods like immunohistochemistry and polymerase chain reaction provided differentiation of Sarcocystis from T. gondii and N. caninum. Transmission electron microscopy demonstrated characteristic features of Sarcocystis sp. as previously described. This is the first confirmed diagnosis of Sarcocystis sp. in the central nervous system of a sheep from Turkey.

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Section: Discussionsupporting

confidence: 86%

Meningoencephalitis caused by pathogenic Sarcocystis species in a naturally infected sheep in Turkey

Alasonyalilar-Demirer

Kahraman²,

Akkoç³

et al. 2017

Tierarztl Prax Ausg G

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“…It revealed only the usual small invaginations. These were classified as micropinocytic pits by Vlemmas et al (1989). Lack of villar protrusions was also noted by Tadros & Laarman (1982) in sarcocysts of S. sebekiin Apodemus sylvaticus.…”

Section: Discussionsupporting

confidence: 53%

“…They wrote of this TEM micrograph: "due to their flexibility [sic] shape, only rarely did the section cut a single projection entirely from the base to the tip." This is also true for a part of the villar protrusions depicted by Dubey et al (1982) and Vlemmas et al (1989). The TEM micrographs of S. tenella ('thick-wall microcysts') by Bergmann & Kinder (1975) showed sloping protrusions.…”

Section: Discussionmentioning

confidence: 71%

“…The villar protrusions of S. hofmanniin roe deer (Entzeroth, 1982: 'Type 1-3'; Entzeroth, 1985: 'S. gracilis';Sedlaczek & Wesemeier, 1995) and in badger (Odening et al, 1994b), of S. tenella in sheep (Dubey et al, 1982(Dubey et al, ,1989Vlemmas et al, 1989;Odening et al, 1995a), and of S. hominis in Bovinae (Tadros & Laarman, 1978;Odening et al, 1994c were described by means of LM and TEM investigations, and those of S. hirsuta in cattle (Tadros & Laarman, 1982) by LM examination, as finger-like. Arranged perpendicularly to the cyst surface, they appear as a palisade of protrusions.…”

Section: Discussionmentioning

confidence: 99%

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A comparative scanning electron microscopic study of the cyst wall in 11 Sarcocystis species of mammals

1996

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Sarcocysts found in the musculature of necropsied mammals were dried with hexamethyldisilazane and examined by scaning electron microscopy. The object of research in this morphological study was the outer surface configuration of the cyst wall. A smooth cyst wall without villar protrusions (Sarcocystic cf. sebeki European badger, Meles meles) was compared with 10 others each with its distinctly characterized villar protrusinos. In scanning electron microscopy these resembled stumpy nails with angular heads (Sarcocystis sp./serow, Capricornis crispus), tongues (S. sp./sambar, Cervus unicolor), ears (S. sp./ wapiti, Crevus elaphus canadensis), elongated cones or clubs (S. sp./domestic horse, Equus caballus), hairs (S. sp./Mongolian gazelle, Procapra gutturosa), and molar teeth (another S. sp./Mongolian gazelle). This study revealed that what appeared in light microscopy to be finger‐like protrusions of Sarcocystis hofamanni in roe deer (Capreolus capreolus), of Sarcocystis hominis in bison (Bison bison), of Sarcocystis hirsuta in cattle (Bos taurus), and of Sarcocystis tenella in sheep (Ovis aries) were more similar to columns (S. hofmanni), straps (S. hominis), stalked polyhedrons (S. hirsuta), or cylinders (S. tenella).

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“…The villar protrusions lack microtubules and thus are folded over the sarcocyst wall (Heydorn and Mehlhorn 1987). There are reports describing the fine structure of cyst structures and their wall in S. gigantea (Munday and Obendorf 1984), S. medusiformis (Obendorf and Munday 1987) and S. tenella (Mehlhorn et al 1975;Vlemmas et al 1989).…”

Section: Introductionmentioning

confidence: 97%

Electron microscopical studies on cysts of Sarcocystis arieticanis within cardiac muscle of naturally infected sheep

Haziroğlu

Güvenç

Tunca

2002

Parasitology Research

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Transmission electron microscopy was used to the cysts and their walls of Sarcocystis arieticanis within cardiac muscle of naturally infected sheep. The general ultrastructural features of the cysts, previously described by other authors, were confirmed. The cyst walls of S. arieticanis and the size and shape of the protrusions at different locations on the cyst wall were explained in detail. The cysts were 35-62.5 micro m x 52.5-162.5 micro m in size and the cyst wall had different-shaped protrusions. Aged cysts that were localized in the heart and differences in the morphology of their protrusions were noticed.

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Ultrastructure of Sarcocystis tenella (Sarcocystis ovicanis)

Cited by 9 publications

References 8 publications

Meningoencephalitis caused by pathogenic Sarcocystis species in a naturally infected sheep in Turkey

Meningoencephalitis caused by pathogenic Sarcocystis species in a naturally infected sheep in Turkey

A comparative scanning electron microscopic study of the cyst wall in 11 Sarcocystis species of mammals

Electron microscopical studies on cysts of Sarcocystis arieticanis within cardiac muscle of naturally infected sheep

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