| influence of rainfall on lungworm infections in bighorn sheep. | from 1959 through 1968, lungs from 124 rocky mountain bighorn sheep (ovis c. canadensis) from the sun river herd in western montana were examined for lungworm infections. all lungs were infected with protostrongylus stilesi and 104 (84%) contained concurrent infections of p. stilesi and p. rushi. significant correlations were observed between levels of lungworm infection and total rainfall during april, may, and june of each year. an explanation of this in terms of terrestrial snail (intermediat ... | 1976 | 1255913 |
| new host and geographic records for two protostrongylids in dall's sheep. | biodiversity survey and inventory have resulted in new information on the distribution of protostrongylidae in dall's sheep (ovis dalli dalli) from the northwest territories (nt, canada) and from alaska (ak, usa). in 1998, parelaphostrongylus odocoilei adults were found for the first time in the skeletal muscles of dall's sheep in the mackenzie mountains (nt). adult p. odocoilei were associated with petechial and ecchymotic hemorrhages and localized myositis; eggs and larvae in the lungs were as ... | 2001 | 11763740 |
| effect of temperature and humidity on the survival of first stage protostrongylus stilesi larvae. | | 1963 | 13958783 |
| climate change and the epidemiology of protostrongylid nematodes in northern ecosystems: parelaphostrongylus odocoilei and protostrongylus stilesi in dall's sheep ( ovis d. dalli ). | we describe the epidemiology of the protostrongylid parasites parelaphostrongylus odocoilei and protostrongylus stilesi in dall's sheep (ovis dalli dalli) from the mackenzie mountains, northwest territories, canada (65 degrees n; 128 degrees w). peak numbers of 1st-stage larvae of both parasites were shed by dall's sheep on their winter range from march until may. in larval development experiments in the mackenzie mountains, peak numbers of infective 3rd-stage larvae of p. odocoilei were availab ... | 2006 | 16332289 |
| protostrongylid parasites and pneumonia in captive and wild thinhorn sheep (ovis dalli). | we describe health significance of protostrongylid parasites (parelaphostrongylus odocoilei and protostrongylus stilesi) and other respiratory pathogens in more than 50 naturally infected dall's sheep (ovis dalli dalli) from the mackenzie mountains, northwest territories (1998-2002) as well as in three stone's sheep (o. d. stonei) experimentally infected with p. odocoilei (2000-2002). histological lesions in the brain and distribution of p. odocoilei in the muscles of experimentally and naturall ... | 2007 | 17495303 |
| muellerius capillaris dominates the lungworm community of bighorn sheep at the national bison range, montana. | lungworm infections are common among bighorn sheep (ovis canadensis) in north america, and the predominant species reported are protostrongylus stilesi and p. rushi. the only records of another lungworm species, muellerius capillaris, infecting bighorns come from south dakota, usa. at the national bison range (nbr), montana, usa we found that across six sampling periods, 100% of wild bighorn sheep surveyed were passing first-stage dorsal-spined larvae (dsl) which appeared to be consistent with m ... | 2010 | 20688711 |
| genetic characterization of protostrongylus shiozawai from japanease serows (capricornis crispus). | abstract protostrongylus shiozawai (nematoda: strongylida) infection is known to occur in the lungs of wild japanese serows (capricornis crispus), and to date, has been classified only by its morphological characteristics, as well as host specificity. to characterize p. shiozawai genetically, a partial sequence of the second internal transcribed spacer (its-2) region was determined and compared with those of related nematodes. our subsequent classification of p. shiozawai based on phylogenetic a ... | 2011 | 21787212 |
| pathologic changes and microorganisms found in bighorn sheep during a stress-related die-off. | an all-age die-off of rocky mountain bighorn sheep (ovis c. canadensis shaw) occurred from late october 1980 through march 1981 in waterton canyon, colorado, with a loss of 75 to 85% of the sheep. the cause of death was a subacute to chronic bronchopneumonia and the primary etiologic agents isolated from the respiratory system were a pasteurella sp., p. multocida, corynebacterium pyogenes, and protostrongylus stilesi dikmans, 1931. the underlying predisposing factors that initiated this die-off ... | 1984 | 6530718 |
| experimental transmission of protostrongylus stilesi to bighorn--mouflon sheep hybrids. | | 1972 | 5012523 |
| cell adherence reactions in lungworm (protostrongylus) infections of the rocky mountain bighorn sheep. | the immunological response of captive naturally-infected rocky mountain bighorn sheep to the lungworm, protostrongylus stilesi, was examined throughout the seasonal cycle of parasite activity using a cell adherence assay for circulating antibody. the net effect of all stable serum factors on cell adherence was examined by exposure of normal cells to larvae in the presence of test serum (decomplemented-serum test). homocytotropic antibody was examined by exposure of washed normal cells to larvae ... | 1972 | 4258549 |
| experimental infections of free-ranging rocky mountain bighorn sheep with lungworms (protostrongylus spp.; nematoda: protostrongylidae). | twelve free-ranging rocky mountain bighorn lambs (ovis canadensis canadensis), each exposed experimentally to 125-1,000 infective third-stage larvae of protostrongylus stilesi and p. rushi, shed significantly more first-stage larvae in their feces than did control lambs, but showed no clinical signs of illness and had equivalent summer and overwinter survival as control lambs. two adult ewes, each exposed to 925 infective larvae, showed no increase in numbers of first-stage larvae in their feces ... | 1987 | 3625896 |
| helminth parasites of bighorn sheep in oregon. | the lungs and gastrointestinal tracts from 18 hunter-killed bighorn rams (ovis canadensis californiana) were examined in total or in part for helminth parasites during a two-year study of three separate herds in eastern oregon. prevalence was 100% with the lungworm protostrongylus stilesi. the gastrointestinal fauna from 11 rams comprised cooperia oncophora, marshallagia marshalli, nematodirus oiratianus, oesophagostomum spp., ostertagia occidentalis, o. ostertagi, skrjabinema ovis, trichostrong ... | 1977 | 864844 |
| "emerging" parasitic infections in arctic ungulates. | important drivers for emergence of infectious disease in wildlife include changes in the environment, shrinking habitats or concentration of wildlife, and movement of people, animals, pathogens, or vectors. in this paper we present three case-studies of emerging parasitic infections and diseases in ungulates in the canadian north. first we discuss climate warming as an important driver for the emergence of disease associated with umingmakstrongylus pallikuukensis, a nematode lungworm of muskoxen ... | 2004 | 21680491 |