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epizootiology of bluetongue: the situation in the united states of america.bluetongue was first reported in the united states in 1948 in sheep in texas. the virus has now been isolated from sheep in 19 states. when the disease first occurs in a flock, the morbidity may reach 50 to 75% and mortality 20 to 50%. in subsequent years, the morbidity may be only 1 to 2% with very few deaths. difference in breed susceptibility has not been observed. natural bluetongue infection has not been observed in angora or dairy goats. bluetongue virus was first isolated from cattle, in ...1975169793
serological evidence of california serogroup virus activity in oregon.we wished to demonstrate evidence of the presence of california serogroup viruses in oregon and to test for the presence of certain other arboviruses in large ungulates. blood samples from black-tailed deer (odocoileus hemionus columbianus), mule deer (o. hemionus hemionus), and roosevelt elk (cervus elaphus roosevelti) from nine counties in oregon were tested by serum-dilution plaque reduction neutralization for antibody to california serogroup viruses, including snowshoe hare, california encep ...19873586196
epizootiologic studies of anaplasmosis in oregon mule deer. 19734784318
anticipating forest and range land development in central oregon (usa) for landscape analysis, with an example application involving mule deer.forest policymakers, public lands managers, and scientists in the pacific northwest (usa) seek ways to evaluate the landscape-level effects of policies and management through the multidisciplinary development and application of spatially explicit methods and models. the interagency mapping and analysis project (imap) is an ongoing effort to generate landscape-wide vegetation data and models to evaluate the integrated effects of disturbances and management activities on natural resource condition ...201020300934
effects of an invasive forest pathogen on abundance of ticks and their vertebrate hosts in a california lyme disease focus.invasive species, including pathogens, can have important effects on local ecosystems, including indirect consequences on native species. this study focuses on the effects of an invasive plant pathogen on a vertebrate community and ixodes pacificus, the vector of the lyme disease pathogen (borrelia burgdorferi) in california. phytophthora ramorum, the causative agent of sudden oak death, is a non-native pathogen killing trees in california and oregon. we conducted a multi-year study using a grad ...201020941513
bovicola tibialis (phthiraptera:trichodectidae): occurrence of an exotic chewing louse on cervids in north america.through a recent (2003-2007) survey of ectoparasites on hoofed mammals in western north america, a literature review, and examination of archived museum specimens, we found that the exotic deer-chewing louse, bovicola tibialis (piaget), is a long-term, widespread resident in the region. the earliest known collection was from salt spring island, canada, in 1941. we found these lice on the typical host, that is, introduced european fallow deer (dama dama l.), and on asian chital (axis axis [erxleb ...201121337942
serosurvey for antibody to deerpox virus in five cervid species in oregon, usa.five cervid species in oregon, usa were tested with a serum neutralization assay for antibody to deerpox virus (dpv). none of the 50 elk (cervus elaphus ssp. roosevelti and nelsonii) had detectable antibody. prevalence of antibody to dpv in the remaining species was: 52% (n=55) in black-tailed deer (odocoileus hemionus columbianus), 32% (n= 59) in mule deer (o. hemionus hemionus), and 36% (n=50) in columbian white-tailed deer (o. virginianus leucurus), with an overall antibody prevalence of 40.2 ...201323307387
epizootiology of sarcocystis infections in mule deer fawns in oregon.from 1974 to 1977, 62 wild mule deer (odocoileus hemionus) fawns from steens mountain, ore were euthanatized in autumn (23 deer), winter (21 deer), and spring (18 deer). the number of sarcocysts of sarcocystis spp was counted in histologic sections of various muscular organs. sarcocysts were seen in the muscle specimens of 14 of the 23 deer euthanatized in autumn (september to november) and in specimens from all 39 deer euthanatized in winter (december and january) and spring (march and april). ...19853935614
hybrid swarm between divergent lineages of mule deer (odocoileus hemionus).studies of hybrid zones have revealed an array of evolutionary outcomes, yet the underlying structure is typically characterized as one of three types: a hybrid zone, a hybrid swarm or a hybrid taxon. our primary objective was to determine which of these three structures best characterizes a zone of hybridization between two divergent lineages of mule deer (odocoileus hemionus), mule deer and black-tailed deer. these lineages are morphologically, ecologically and genetically distinct, yet hybrid ...201122066874
hair-loss syndrome in black-tailed deer of the pacific northwest.a widespread hair-loss syndrome (hls) has affected columbian black-tailed deer (odocoileus hemionus columbianus) in western oregon and washington (usa) since 1996. in order to better characterize the condition, 21 hls-affected black-tailed deer (btd) were necropsied, and body condition, parasite burdens, and significant lesions were noted. all deer were in poor body condition, and at least 17 had severe internal parasite burdens. a consistent finding was the presence of large numbers of chewing ...200415650084
ocular plague (yersinia pestis) in mule deer (odocoileus hemionus) from wyoming and oregon.although plague is relatively rare in wild ungulates, this report describes ocular lesions associated with yersinia pestis infection in three free-ranging mule deer (odocoileus hemionus) from wyoming and oregon, usa. all deer were observed antemortem and seemed to be blind. post-mortem examination revealed gross lesions of bilateral keratoconjunctivitis and/or panophthalmitis in the first two deer, but only partial retinal detachment in the third deer. microscopically, all deer had moderate-to-s ...200818957655
parelaphostrongylus odocoilei in columbian black-tailed deer from oregon.documenting the occurrence of parelaphostrongylus odocoilei has historically relied on the morphological examination of adult worms collected from the skeletal muscle of definitive hosts, including deer. recent advances in the knowledge of protostrongylid genetic sequences now permit larvae to be identified. dorsal-spined larvae (dsls) collected in 2003-2004 from the lung and feces of six columbian black-tailed deer (odocoileus hemionus columbianus) from oregon were characterized genetically. th ...200617092883
muscleworms, parelaphostrongylus andersoni (nematoda: protostrongylidae), discovered in columbia white-tailed deer from oregon and washington: implications for biogeography and host associations.parelaphostrongylus andersoni is considered a characteristic nematode infecting white-tailed deer (odocoileus virginianus). host and geographic distribution for this parasite, however, remain poorly defined in the region of western north america. fecal samples collected from columbia white-tailed deer (o. v. leucurus) in a restricted range endemic to oregon and washington, usa, were examined for dorsal-spined larvae characteristic of many protostrongylid nematodes. multilocus dna sequence data ( ...200818263818
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