Publications

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an evolving pattern of human hydatid disease transmission in the united states.echinococcus granulosus infection was being acquired in the contiguous united states by virginia sharecroppers and small-holders by the turn of the century. the last recorded human infection from that general area was diagnosed in 1947. by 1920 human infections were also being acquired in the lower mississippi valley. apparently, infection in both of these areas was maintained chiefly in swine. by 1940 a third transmission area definitely existed in the central valley of california, with its res ...1977329700
epidemiologic investigation of echinococcosis in american indians living in arizona and new mexico.ten cases of echinococcosis diagnosed in american indians in arizona and new mexico between 1972 and 1975 were investigated as part of a regional epidemiologic study. patients were visited at home to discover factors associated with local parasite transmission, to detect possible additional cases among family members, and to perform diagnostic tests on dogs. six patients were navajo, 2 zuni, and 2 santo domingo indians. an additional case in a navajo man was detected by serologic testing of pati ...1977842773
echinococcosis in american indians living in arizona and new mexico: a review of recent studies. 1977920725
identification and characterization of bahia grande, reed ranch and muir springs viruses, related members of the family rhabdoviridae with widespread distribution in the united states.sixteen virus isolates with similar biological characteristics were obtained from salt-marsh mosquitoes collected in south texas in 1974. when compared antigenically, these and 13 other isolates from mosquitoes collected between 1972 and 1979 in west texas, new mexico, louisiana, colorado and north dakota were shown to be related but not identical. three distinct serotypes were determined: bahia grande (prototype strain tb4-1054), reed ranch (tb4-222) and muir springs (76v-23524). when examined ...19862872270
evaluation of environmental factors affecting birth, weaning and yearling traits in navajo sheep. 19705529706
the assessment of human exposure to radionuclides from a uranium mill tailings release and mine dewatering effluent.this study provides an assessment of human exposure to radiation from a river system contaminated by radionuclides of the 238u decay series released through a dam break at a uranium mill tailings pond and by the continuous discharge of dewatering effluent from 2 uranium mines. the in vivo analyses of radionuclides in 6 navajo indians who lived near the river indicate no detectable elevations above background concentrations. dose estimates for inhalation of suspended river sediment indicate a max ...19846469647
preliminary evaluation of ivermectin for control of psoroptes ovis in desert bighorn sheep. 19836687742
survey of chronic sinusitis-induced skull anomalies in desert bighorn sheep.bone anomalies were found in 20% of 630 skulls from desert bighorn sheep (ovis canadensis) representing populations of california bighorn (o canadensis californiana), lower california bighorn (o canadensis cremnobates), mexican bighorn (o canadensis mexicana), and nelson bighorn (o canadensis nelsoni) that are native to arizona, california, nevada, new mexico, and utah. the anomalies were extremely diverse, ranging from osteonecrosis within the matrix of the paranasal sinuses to extensive lysis ...19817327996
psoroptic scabies in bignorn sheep (ovis canadensis mexicana) in new mexico.prior to 1978, no reports were made of scabies lesions or mites recovered from any mexican bighorn sheep (ovis canadensis mexicana) examined in the san andres national wildlife refuge in southern new mexico. in 1978, all of five rams harvested by hunters had live mites of the genus psoroptes and active lesions of scabies in their ears and/or on their bodies. deaths due to scabies were not documented during this outbreak although aerial helicopter surveys conducted in march, june and september, ...19807373729
the distribution of dermacentor hunteri and anaplasma sp. in desert bighorn sheep (ovis canadensis).the ixodid tick dermacentor hunteri has been collected intermittently this century, primarily from desert bighorn sheep (ovis canadensis). anaplasma spp. are intraerythrocytic rickettsial parasites of ungulates and are vectored in the western united states by ticks of the genus dermacentor. we tested the hypotheses that d. hunteri would be found infesting all populations of desert bighorn, and that all infested populations would be seropositive for anaplasma sp. dermacentor hunteri was found on ...19979057693
evaluation of bluetongue virus diagnostic tests in free-ranging bighorn sheep.five bluetongue virus (btv) diagnostic tests were evaluated for use in free-ranging bighorn sheep. we sampled one bighorn sheep population four times between 1989 and 1995. the tests evaluated included virus isolation (vi), polymerase-chain reaction (pcr), serum neutralization (sn), agar-gel immunodiffusion (agid), and competitive enzyme-linked immunosorbent assay (c-elisa). the c-elisa, agid and sn tests had high levels of agreement in determining serogroup exposure in bighorn sheep. we used ma ...19989689659
comparative molecular characterization of corynebacterium pseudotuberculosis of different origin.ribotyping and susceptibility to 17 antimicrobial agents were used to compare 37 isolates of corynebacterium pseudotuberculosis (28 from horses, 1 from cattle, 3 from sheep and 5 from goats) derived from various types of lesions, and different geographic locations. according to the presence of nitrate reductase, all but one isolate from horses reduced nitrate (nitrate-positive), whereas all isolates from sheep and goats were unable to reduce nitrate (nitrate-negative). the ribotype of the nitrat ...19989695286
management factors affecting the risk for vesicular stomatitis in livestock operations in the western united states.to identify management factors affecting the risk of animals developing vesicular stomatitis (vs).199910553436
elaeophorosis in bighorn sheep in new mexico.two bighorn sheep (ovis canadensis) in new mexico (usa) were found to be naturally infected with elaeophora schneideri. an adult ram examined in 1997 in the fra cristobal mountains had 26 nematodes in the carotid and iliac arteries, and microfilariae were present in the skin, nasal mucosa, brain, and lungs. this ram was markedly debilitated prior to euthanasia and extensive crusty, scabby lesions were observed on its head. in 1998, a yearling ewe found dead adjacent to watson mountain near the g ...199910574542
ecology. lion versus lamb. 200211951327
control of oestrus ovis in sheep on an isolated range. 196314079476
infectious disease survey of gemsbok in new mexico.exotic wildlife can introduce new diseases or act as reservoirs of endemic diseases. on white sands missile range, new mexico (usa), significant declines in populations of native ungulates generally correspond to increases in range and population density of the exotic gemsbok (oryx gazella gazella), introduced beginning in 1969. we surveyed gemsbok in 2001 for exposure to a variety of diseases potentially important for native ungulates. high seroprevalence was found for malignant catarrhal fever ...200314733271
the rise and fall of psoroptic scabies in bighorn sheep in the san andres mountains, new mexico.between 1978 and 1997, a combination of psoroptic scabies (psoroptes spp.), mountain lion (puma concolor) predation, and periodic drought reduced a population of native desert bighorn sheep (ovis canadensis) in the san andres mountains (sam), new mexico, from >200 individuals to a single ewe. in 1999, this ewe was captured, ensured to be psoroptes-free, and released back into the sam. eleven radio-collared rams were translocated from the red rock wildlife area (rrwa) in new mexico into the sam r ...200516244062
bighorn sheep, mountain lions, and the ethics of conservation. 200617002750
wildlife translocation: the conservation implications of pathogen exposure and genetic heterozygosity.a key challenge for conservation biologists is to determine the most appropriate demographic and genetic management strategies for wildlife populations threatened by disease. we explored this topic by examining whether genetic background and previous pathogen exposure influenced survival of translocated animals when captive-bred and free-ranging bighorn sheep (ovis canadensis) were used to re-establish a population that had been extirpated in the san andres mountains in new mexico, usa.201121284886
uranium and associated heavy metals in ovis aries in a mining impacted area in northwestern new mexico.the objective of this study was to determine uranium (u) and other heavy metal (hm) concentrations (as, cd, pb, mo, and se) in tissue samples collected from sheep (ovis aries), the primary meat staple on the navajo reservation in northwestern new mexico. the study setting was a prime target of u mining, where more than 1100 unreclaimed abandoned u mines and structures remain. the forage and water sources for the sheep in this study were located within 3.2 km of abandoned u mines and structures. ...201728788090
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