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1
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Life cycle and biology of Neospora caninum

100%
Dubey J. P.
Wiadomości Parazytologiczne. Suplement
|
2005
|
tom 51
2
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Reservoirs of Neospora caninum in domestic and wild animals

100%
Dubey J. P.
Wiadomości Parazytologiczne. Suplement
|
2005
|
tom 51
3

Severe intestinal coccidiosis in a newborn lion [Panthera leo]

63%
Dubey J. P., Jardine J. E.
Acta Protozoologica
|
2008
|
tom 47
|
nr 1
63-68
4

Morphologic characterization of Sarcocystis sp.sarcocysts from the Buffon's macaw [Ara ambigua]

63%
Dubey J. P., Morales J. A.
Acta Parasitologica
|
2006
|
tom 51
|
nr 4
A species of Sarcocystis is reported from two naturally infected Buffon’s macaws (Ara ambigua) from Costa Rica. Only mature sarcocysts, measuring up to 950 μm in length and up to 75 μm in width, were observed. By light microscopy the sarcocyst wall was thin (< 1 μm thick) and smooth. The villar protrusions on the sarcocyst wall were up to 4.0 μm long and up to 0.6 μm wide; they were folded over the sarcocyst wall giving a thin-walled appearance. The microtubules in villar protrusions were smooth and confined to villar protrusions. Bradyzoites in sections were 4.0–5.9 × 0.8–1.8 μm in size. Structurally, sarcocysts from the macaw appeared different from sarcocysts of other avian species. This is the first report of Sarcocystis infection in this host.
5
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Bovine neosporosis: pathogenesis of abortion and immunity

51%
Buxton D., Wouda W., Dubey J. P.
Wiadomości Parazytologiczne. Suplement
|
2005
|
tom 51
6
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Neospora caninum cyclophilin elicits interferon-gamma production

51%
Tuo W., Fetterer R., Jenkins M., Dubey J. P.
Wiadomości Parazytologiczne. Suplement
|
2005
|
tom 51
7

Molecular phylogeny implicates new world opossums [Didelphidae] as the definitive hosts of Sarcocystis ramphastosi, a parasite of the Keel-billed Toucan [Ramphastos sulfuratus]

51%
Dubey J. P., Morales J. A., Leanrdo D., Rosenthal B. M.
Acta Protozoologica
|
2008
|
tom 47
|
nr 1
55-61
8

Sarcocystis ramphastosi sp.nov. and Sarcocystis sulfuratusi sp.nov. [Apicomplexa, Sarcocystidae] from the keel-billed toucan [Ramphastos sulfuratus]

51%
Dubey J. P., Lane E., Van Wilpe E.
Acta Parasitologica
|
2004
|
tom 49
|
nr 2
Two new species of Sarcocystis, Sarcocystis ramphastosi sp. nov. and Sarcocystis sulfuratusi sp. nov. are described from a naturally infected keel-billed toucan (Ramphastos sulfuratus). Only sarcocysts were found and they were mature. Sarcocysts of S. ramphastosi were up to 3 mm long and up to 1 mm wide. The sarcocyst wall was smooth. The villar protrusions on the sarcocyst wall of S. ramphastosi were up to 6.5 µm long and up to 3 µm wide; they were folded over the sarcocyst wall giving a thin-walled appearance. The microtubules in villar protrusions were smooth and confined to villar protrusions. Bradyzoites in sections were 4-4.5 × 1.3-1.6 µm in size. Sarcocysts of S. sulfuratusi were up to 900 µm long and up to 200 um wide. The sarcocyst wall was smooth and thin-walled. The villar protrusions were up to 4.3 µm long and 1.4 µm wide. The microtubules in villar protrusions extended deeper into the granular layer of the sarcocyst wall and those in the granular layer were more electron-dense than in the villar protrusions. Bradyzoites were 5.0-7.0 × 1.5-2.2 um in size.
9

Morphologic and genetic characterization of Sarcocystis sp.from the African grey parrot, Psittacus erithacus, from Costa Rica

51%
Dubey J. P., Rosenthal B. M., Morales J. A., Alfaro A.
Acta Parasitologica
|
2006
|
tom 51
|
nr 3
A species of Sarcocystis is reported from a naturally infected African grey parrot, Psittacus erithacus, from Costa Rica. Only mature sarcocysts, measuring up to 2 mm in length and up to 750 μm in width, were observed. The sarcocyst wall was smooth. The villar protrusions on the sarcocyst wall were up to 5 μm long and up to 1.1 μm wide; they were folded over the sarcocyst wall giving a thin-walled appearance. The microtubules in villar protrusions were smooth and confined to villar protrusions. Bradyzoites in sections were 5.4–6.6 × 1.3–2.0 μm in size. Sequencing the small subunit and first internal transcribed spacer portions of ribosomal DNA related this parasite to, but distinguished it from, previously characterized species of Sarcocystis that encyst in the musculature of birds and complete their sexual development in New World opossums of the genus Didelphis. This evidence suggests that the parrot may have acquired its infection from an opossum from which it suffered a debilitating attack a year prior to the onset of depression, anorexia, and ultimately death.
10

Ultrastructural characteristics of a Lankesterella-like coccidian causing pneumonia in a Northern Cardinal [Cardinalis cardinalis]

51%
Speer C. A., Baker D. G., Yamaguchi A., Dubey J. P.
Acta Protozoologica
|
1997
|
tom 36
|
nr 1
11

Neonatal Neospora caninum infections in dogs

51%
Dubey J. P., Knickman E., Greene C. E.
Acta Parasitologica
|
2005
|
tom 50
|
nr 2
Neosporosis was diagnosed ante-mortem in a litter of neonatally-infected dogs. Three pups developed weakness of limbs 7-9 weeks after birth. One of the dogs developed megaesophagus. Treatment with clindamycin improved clinical signs but did not eradicate the parasite. All 3 dogs were euthanized and viable N. caninum was isolated from the brains of all 3 dogs. Tissue cysts were found in the brain and muscles of dogs. The dam was bred again. Seven apparently healthy pups were born in the second litter. Six of the 7 pups from the second litter had no demonstrable N. caninum antibodies at 32 day of age. The seventh pup had high (1:1280) titer in the Neospora agglutination test and the titer remained stable at day 227 when the study was discontinued. The results suggest that the rate of congenital transmission of N. caninum decreased in the subsequent pregnancy.
12

Sarcocystis arctosi sp.nov. [Apicomplexa, Sarcocystidae] from the brown bear [Ursus arctos], and its genetic similarity to schizonts of Sarcocystis canis-like parasite associated with fatal hepatitis in polar bears [Ursus maritimus]

45%
Dubey J. P., Rosenthal B. M., Sundar N., Velmurugan G. V., Beckmen K. B.
Acta Parasitologica
|
2007
|
tom 52
|
nr 4
The tissues of herbivores are commonly infected with cysts of parasites belonging to the apicomplexan genus Sarcocystis, but such sarcocysts are rare in bears. Here, we describe a new species, Sarcocystis arctosi, based on the mature sarcocysts identified in two brown bears (Ursus arctos) from Alaska, USA. Microscopic sarcocysts (37–75 × 20–42 μm) had thin walls (<1 μm). The outer layer of the sarcocyst, the parasitophorous vacuolar membrane (pvm), was wavy in outline and had minute undulations that did not invaginate towards the sarcocyst interior; these undulations occurred at irregular intervals and measured up to 100 nm in length and up to 60 nm width. The ground substance layer beneath the pvm was smooth and lacked microtubules. Longitudinally cut bradyzoites measured 5.6–6.8 × 0.7–1.8 μm. A major portion of nuclear small subunit rDNA sequence obtained from these sarcocysts was similar to that previously obtained from the hepatic schizonts of a S. canis-like parasite from polar bears (Ursus maritimus).
13

Epidemiological investigation of Toxoplasma gondii infections in commercial sheep flock in an endemic area for ocular toxoplasmosis in Southern Brazil

39%
Consalter A., Frazao-Teixeira E., Dubey J. P., Zanella E. L., da Silva A. F., de Souza G. N., Ferreira A. M. R.
Acta Parasitologica
|
2019
|
tom 64
|
nr 3
14

Seroprevalence of Toxoplasma gondii among turkeys on family farms in the state of Northeastern Brazil

39%
Sa S. G., Lima D. C. V., Silva L. T. R., Pinheiro Junior J. W., Dubey J. P., Silva J. C. R., Mota R. A.
Acta Parasitologica
|
2016
|
tom 61
|
nr 2
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