The site of development, survival of larvae, and reaction to the presence of Physaloptera maxillaris [a nematode parasite of the skunk Mephitis mephitis that has arthropod intermediate hosts] are described in Gryllus pennsylvanicus Burm. (Acheta pennsylvanicus) and Blattella germanica (L.) from obse...

Two hundred and eleven of 4404 (4.8%) crows (Corvus brachyrhynchos) collected in the winters of 1976-77 and 1977-78 in Essex County, southwestern Ontario, were infected with Diplotriaena tricuspis (Fedtschenko, 1874) Henry and Ozoux, 1909. Prevalence of potentially patent infections was only 2.6%, h...

The development of the sarcocyst of Sarcocystis rauschorum in its intermediate host was studied. Lemmings were orally administered sporocysts of S. rauschorum obtained from snowy owls (Nyctea scandiaca). Beginning at 9 days postinoculation (DPI) and at various intervals to 84 DPI, skeletal muscle ti...

Free sporocysts of a Sarcocystis-like organism (11.6 x 9.2 micro m with a diffuse residuum of numerous small refractile granules) from intestinal scrapings of an N. scandiaca from Saskatchewan, Canada, were orally administered to laboratory-reared D. richardsoni. Merants were present in hepatocytes ...

We have determined the nucleotide sequence of the nuclear gene encoding small-subunit ribosomal ribonucleic acid of the ciliate Anophryoides haemophila, a parasite of the American lobster Homarus americanus. The gene is 1763 bp in length, and has a guanosine-plus-cytosine content of 43.9%. Inferred ...

Skeletal and cardiac muscle from wild geese dead of avian cholera was examined and sarcocysts 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 ce...

Three B. virginianus were fed oocysts of C. bubonis and 3 were each fed 2 mice which had been orally infected with sporulated oocysts of C. bubonis 4 weeks previously. Faeces were examined daily by flotation and daily oocyst production was estimated. One B. virginianus was given sporulated oocysts o...

Sequences of nuclear-encoded small-subunit rRNA genes have been determined for representatives of the enigmatic genera Dermocystidium, Ichthyophonus, and Psorospermium, protistan parasites of fish and crustaceans. The small-subunit rRNA genes from these parasites and from the "rosette agent&quo...

Sporulated oocysts (mean dimensions = 13.0 x 10.8 microns) and sporocysts (11.3 x 5.5 microns) of a coccidian resembling Frenkelia sp. or Sarcocystis sp. were present in the lamina propria of the small intestine of a naturally-infected northern spotted owl (Strix occidentalis caurina) collected near...

This review critically examines information on structure and developmental cycles, systematics and diagnosis, techniques, pathogenesis of infection, immunological responses, epidemiology, control and directions for future research on species of Sarcocystis in man, livestock, wildlife and other hosts...

Sporozoites of Sarcocystis capracanis and S. tenella (Apicomplexa) penetrated all four cell types tested (bovine monocytes, BM; bovine pulmonary artery endothelial cells, CPA; Madin-Darby bovine kidney; and ovine monocytes). Sporozoites of S. tenella developed to meronts in BM and CPA; those of S. c...

The intermediate hosts for Sarcocystis rileyi (Stiles 1893) Minchin 1913 are ducks (Anas spp.), and the striped skunk (Mephitis mephitis) is its definitive host. The structure of sarcocysts from an experimentally infected shoveler duck (Anas cylpeata) fed sporocysts from an experimentally-infected M...

Meronts, merozoites, oocysts and unidentified stages of a new species of Eimeriidae were found in the reproductive tract of one of 4 C. canadensis nelsoni bulls shot at the beginning of the rut season in Saskatchewan, Canada. The eimeriids were seen free in the luminal content and, on one occasion o...

The early endogenous development of S. rauschorum in D. richardsoni was studied. After determining the dose-response effects of sporocysts of S. rauschorum on lemmings (doses greater than 500 sporocysts were lethal during hepatic merogony), sporocysts were administered to additional lemmings that we...

Coccidia-free, artificially reared lesser snow geese and ducks (Anas strepera, A. platyrhynchos and A. discors) were inoculated orally with sporulated oocysts of Eimeria sp. from the ureter of heavily infected juvenile lesser snow geese from Manitoba, Canada. In the experimentally infected geese, oo...

I. brachyrhynchi were recovered from faeces of experimentally infected juvenile crows (Corvus brachyrhynchos) and stored for up to 12 months in a 2.5% (w/v) solution of potassium dichromate at 4 degrees C. Sporocysts were released from the oocysts by grinding in a homogenizer. Various bile salts, ta...

Although 1993 landings of lobsters were valued at $300 million in Canada and $210 million in the United States, postharvest losses are 10-15% annually. "Bumper car" disease of lobsters caused by the scuticociliate Anophryoides haemophila, can be significant in coldwater impoundments. Altho...

Developmental stages of Cryptosporidium sp. (Protozoa: Cryptosporiidae) were observed in tracheal epithelium of two groups of turkey poults from a farm in central Saskatchewan. Lesions associated with the parasite included excess mucus, epithelial hyperplasia and metaplasia and necrosis, and macroph...

Between 1980 and 1982 the kidneys of 627 waterfowl from Saskatchewan, Canada, were examined for oocysts by a modified flotation technique. Eimeria spp. were detected in 136 of 289 ducks (11 of 12 species), 130 of 287 geese (2 species) and 2 of 4 whistling swans (Cygnus columbianus). Bucephala clangu...

Besnoitia sp. was diagnosed in two caribou (Rangifer tarandus caribou) which died of pneumonia at the Assiniboine Park Zoo (Winnipeg, Manitoba, Canada) in 1983. During the following 3 yr besnoitiosis spread to an isolated herd of caribou, to mule deer (Odocoileus hemionus hemionus) and to reindeer (...

Muscle containing macroscopic cysts of Sarcocystis sp. from naturally infected wild shoveler (Anas clypeata) ducks was fed to two captive striped skunks (Mephitis mephitis). The skunks passed sporocysts in their feces beginning 19 and 22 days post-infection, and continued to pass small numbers of sp...

Sporulated oocysts (10.1 X 15.3 mu m) and free sporocysts (8.0 X 10.2 mu m, with a large, round sporocyst residuum consisting of a single refractile granule) of Sarcocystis campestris n.sp. were obtained from intestinal scrapings of Taxidea taxus (carcasses frozen 2 years at -20 deg C) from Saskatch...