Publications

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contagious ecthyma in bighorn sheep and mountain goat in western canada.contagious ecthyma (ce) is reported in bighorn sheep (ovis c. canadensis) from several national parks in western canada and in moutain goat (oreamnos americanus) from kootenay national park, british columbia. (this is the first report of ce in mountain goat.) diagnosis was based on clinical signs, histopathology, transmission experiments and the demonstration of a proxvirus with the electron microscope. the infection was transmitted from wild to domestic goat, but not to domestic sheep. most inf ...19751113436
differences in paralyzing ability and sites of attachment to cattle of rocky mountain wood ticks (acari: ixodidae) from three regions of western canada. 19853981550
genome-wide set of snps reveals evidence for two glacial refugia and admixture from postglacial recolonization in an alpine ungulate.past glaciation events have played a major role in shaping the genetic diversity and distribution of wild sheep in north america. the advancement of glaciers can isolate populations in ice-free refugia, where they can survive until the recession of ice sheets. the major beringian refugium is thought to have held thinhorn sheep (ovis dalli) populations during times of glacial advance. while isolation in the major refugium can account for much of the genetic and morphological diversity seen in ext ...201627272944
incursion of epizootic hemorrhagic disease into the okanagan valley, british columbia in 1999.in september 1999, unusually high mortality rates in white-tailed deer and california bighorn sheep occurred in the southern okanagan valley. necropsy and histopathologic findings were compatible with epizootic hemorrhagic disease (ehd); the presence of virus was not demonstrated. subsequent serologic and polymerase chain reaction assays on sentinel cattle suggested an ehd virus incursion.200111265190
contagious ecthyma in mountain goat of coastal british columbia.contagious ecthyma has been reported previously from mountain goat (oreamnos americanus) in one restricted area of eastern british columbia. a second focus of infection is reported for mountain goat from western british columbia. diagnosis was based on appearance of lesions at necropsy, histopathology and demonstration of poxvirus with the electron microscope. the epizootiology of this infection in mountain goat is discussed briefly.1977559107
herbivory more limiting than competition on early and established native plants in an invaded meadow.the dominance of nonnative plants coupled with declines of native plants suggests that competitive displacement drives extinctions, yet empirical examples are rare. herbivores, however, can alter vegetation structure and reduce diversity when abundant. herbivores may act on mature, reproductive life stages whereas some of the strongest competitive effects might occur at early life stages that are difficult to observe. for example, competition by perennial nonnative grasses can interfere with the ...200819137935
excerpts from: on "tick paralysis" in sheep and man following bites of dermacentor venustus. 1913. 200010970153
incursion of bluetongue virus into the okanagan valley, british columbia.bluetongue virus was isolated from a sentinel herd in british columbia. virus isolation was by intravenous inoculation of embryonated chicken eggs and subculture in bhk-21 cells. the cytopathic agent was identified as bluetongue virus by electron microscopy and the immunoperoxidase test. the serotype was identified as serotype 11 by virus neutralization.200010769769
isoenzyme analysis of human and animal isolates of giardia duodenalis from british columbia, canada.isoenzyme patterns of 32 isolates of giardia duodenalis, obtained from 6 beavers and 11 humans from british columbia, plus 15 other isolates were evaluated using thin-layer starch-gel electrophoresis. we attempted to use 12 enzymes; 9 gave reproducible and interpretable results. the isoenzyme patterns of the isolates were classified into 12 groups with 17 (53%) of the 32 isolates confined to 1 group. the other 11 groups each comprised only 1 or 2 isolates. there was no obvious correlation betwee ...19892802023
yersinia enterocolitica isolated from animals in the fraser valley of british columbia. 19725029894
an outbreak of q fever probably due to contact with a parturient cat.thirty-three cases (24 definite, nine probable) of q fever were diagnosed in victoria county, cape breton, nova scotia from may to august, 1985. twenty-six of the cases occurred in residents of baddeck (population 900, attack rate 2.8 percent), and 21 of the cases occurred during the month of june. there was geographic clustering of the cases: 14 of the 33 (42 percent) lived or worked in four buildings located side by side in the center of town. a case control study revealed that 25 of 29 cases ...19883335174
consecutive outbreaks of epizootic haemorrhagic disease of deer and bluetongue. 19882837861
possible introduction of epizootic hemorrhagic disease of deer virus (serotype 2) and bluetongue virus (serotype 11) into british columbia in 1987 and 1988 by infected culicoides carried on the wind.outbreaks of epizootic hemorrhagic disease of deer and of bluetongue began in british columbia in august and october 1987 respectively and recrudescence of infection by both viruses was detected the following year in august. weather records for up to 18 days before the initial outbreaks of disease, isolation of virus or seroconversion were examined to determine if the viruses could have been introduced by infected culicoides carried on the wind. data on temperature, rainfall, wind speed and dire ...19911665099
the perspicacity of seymour hadwen on tick paralysis--a commentary. 200010921363
contact with livestock--a protective effect against allergies and asthma?a 'protective farm factor' possibly related to livestock exposure is hypothesized to reduce the risk for allergic sensitization.200616961711
geographic distribution of the muscle-dwelling nematode parelaphostrongylus odocoilei in north america, using molecular identification of first-stage larvae.molecular identification of dorsal-spined larvae (dsl) from fecal samples indicates that the protostrongylid parasite parelaphostrongylus odocoilei occupies a broader geographic range in western north america than has been previously reported. we analyzed 2,124 fecal samples at 29 locations from thinhorn sheep (ovis dalli dalli and o. d. stonei), bighorn sheep (ovis canadensis canadensis and o. c. californiana), mountain goats (oreamnos americanus), woodland caribou (rangifer tarandus caribou), ...200516108550
petting zoo-associated escherichia coli 0157:h7--secondary transmission, asymptomatic infection, and prolonged shedding in the classroom. 200415536809
serological classification and virulence determination of dichelobacter nodosus isolated from alberta and british columbia sheep.ovine footrot is a contagious disease of sheep that occurs in temperature climates. it is caused by the strict anaerobe, dichelobacter nodosus. benign and virulent organisms are differentiated according to serotype and protease production. this study was conducted to identify the presence of virulent serotypes of d. nodosus in sheep flocks in alberta and british columbia. dichelobacter nodosus was detected in lame sheep from 11 of 15 (73%) flocks in alberta and in 4 of 5 (80%) british columbia f ...19989442937
giant hydatid lung cysts in the canadian northwest: outcome of conservative treatment in three children.hydatid lung disease due to echinococcus granulosus in the canadian northwest and alaska is often asymptomatic and usually benign. we reviewed the course and outcome of three children with giant hydatid lung cyst seen over a 2-year period. all were north american indian children aged 9 to 12 years who presented with cough, fever, and chest pain. one had a rash. there was a history of exposure to domestic dogs who had been fed moose entrails in each case. chest x-rays showed solitary lung cysts w ...19938308679
evidence for bluetongue virus in canada: 1976-1979.since the identification of approximately 1 400 bovine serological reactors to bluetongue virus in the okanagan valley of british columbia in 1976, there has been no evidence of virus establishment in canada. no clinical signs suggestive of bluetongue were observed. it was not possible to demonstrate viral activity at the time the seropositive animals were detected and subsequent serological testing supports the hypothesis that the virus has not become endemic or indeed survived in canadian catt ...19826293686
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