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
contagious caprine pleuropneumonia in arizona. 19724638537
isolations of aerobic bacteria from wild desert bighorn sheep (ovis canadensis nelsoni and o. c. mexicana) in arizona.nasal, pharyngeal, cervical and vaginal swab specimens were obtained from 74 desert bighorn sheep for the purpose of investigating the normal aerobic bacterial flora of wild sheep. a total of 281 isolates was obtained and identified by standard microbiologic tests. one hundred seven of these isolates were gram positive and included bacillus sp. (36%), staphylococcus epidermidis (8%), s. aureus (4%), corynebacterium sp. (diphtheroids, 4%), and streptococcus sp. (48%). gram negative isolates total ...19836887449
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
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
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
sheep-associated malignant catarrhal fever in a petting zoo.in a privately owned petting zoo in arizona, 17 deer from five different species, white-tailed deer (odocoileus virginianus), reeve's muntjac (muntiacus reevesi), mule deer (odocoileus hemionus), reindeer (rangifer tarandus), and axis deer (axis axis), died of suspected malignant catarrhal fever (mcf) over a period from late 1992 to early 1995. a pcr assay specific for ovine herpesvirus 2, the putative causative agent of sheep-associated mcf, and a competitive-inhibition enzyme-linked immunosorb ...199910572865
an epidemiologic study of trends in prevalence of rheumatoid factor seropositivity in pima indians: evidence of a decline due to both secular and birth-cohort influences.previous population studies have suggested that both rheumatoid factor (rf) production and rheumatoid arthritis (ra) may be declining in occurrence, and both secular and birth-cohort influences have been implicated. since pima indians have a very high incidence of ra and also have shown recent evidence of a decline in ra, this study evaluated the relative contributions of age, secular, and birth-cohort influences on rf seropositivity in the pima indian population.200212124855
rabies surveillance in the united states during 2001.during 2001, 49 states and puerto rico reported 7,437 cases of rabies in nonhuman animals and 1 case in a human being to the centers for disease control and prevention, an increase of < 1% from 7,364 cases in nonhuman animals and 5 human cases reported in 2000. more than 93% (6,939 cases) were in wild animals, whereas 6.7% (497 cases) were in domestic species (compared with 93.0% in wild animals and 6.9% in domestic species in 2000). the number of cases reported in 2001 increased among bats, cat ...200212494966
culicoides mohave (diptera: ceratopogonidae): new occurrence records and potential role in transmission of hemorrhagic disease.biting midges of the genus culicoides are important in the transmission of viral diseases affecting wild and domestic ungulates, including bluetongue (blu) and epizootic hemorrhagic disease (ehd). the primary known vector for these viruses is c. sonorensis wirth & jones, however, it has been speculated that other species of culicoides may also be involved. one potential candidate is c. mohave, a poorly studied species found in inland desert areas of the southwestern united states. in 2000 and 20 ...200314680129
androgen control of immunocompetence in the male house finch, carpodacus mexicanus müller.the immunocompetence handicap (ich) hypothesis predicts that elevated levels of the gonadal androgen testosterone (t) entail obligatory costs, such as immunosuppression, but evidence supporting this immunosuppressive influence is equivocal. to investigate this question, adult males house finches, carpodacus mexicanus, were exposed to short days and chronically treated with t-filled (t males; n=10) or empty (c males; n=10) silastic capsules. testosterone administration increased plasma t levels a ...200515781889
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
coliform bacteria in sierra nevada wilderness lakes and streams: what is the impact of backpackers, pack animals, and cattle?the presence of coliform bacteria indicates a watershed risk for harboring microbes capable of causing human disease. we hypothesized that water from watersheds that have different human- or animal-use patterns would have differing risks for the presence of coliform bacteria. methods; water was collected in wilderness areas of the sierra nevada range in california. a total of 60 sites from lakes or streams were selected to statistically differentiate the risk categories: 1) high use by backpacke ...200616538940
infectious keratoconjunctivitis in bighorn sheep, silver bell mountains, arizona, usa.an infectious keratoconjunctivitis (ikc) epizootic in bighorn sheep (ovis canadensis) occurred in the silver bell mountains, arizona, usa, from 1 december 2003 to 31 march 2004. we used standard culture methods and polymerase chain reaction (pcr) amplification of the 16s rrna gene to test for the causative agents of ikc and other diseases reported to be associated with bighorn sheep populations. all bighorn sheep and domestic goat test results were negative except for mycoplasma spp. and branham ...200616870866
evaluation of salmonella occurrence in domestic animals and humans in north dakota (2000-2005).to evaluate the occurrence, serotypes, and antimicrobial susceptibility of salmonellae from domestic animals and humans in north dakota.200718041964
potential effects of the united states-mexico border fence on wildlife.security infrastructure along international boundaries threatens to degrade connectivity for wildlife. to explore potential effects of a fence under construction along the u.s.-mexico border on wildlife, we assessed movement behavior of two species with different life histories whose regional persistence may depend on transboundary movements. we used radiotelemetry to assess how vegetation and landscape structure affect flight and natal dispersal behaviors of ferruginous pygmy-owls (glaucidium b ...201019558522
rapid decrease in horn size of bighorn sheep: environmental decline, inbreeding depression, or evolutionary response to trophy hunting?there are numerous examples demonstrating that selection has greatly influenced phenotypes in wild-harvested species. here, a significant reduction in horn size in trophy desert bighorn sheep rams over 30 years in a reintroduced population in aravaipa canyon, arizona is documented. after examining the potential effects of a detrimental change in the environment, inbreeding depression, and hunter-caused evolutionary change, it appears that environmental deterioration, apparently from the effects ...201121900210
hemorrhagic disease in bighorn sheep in arizona.two bighorn sheep from arizona (usa) were submitted for necropsy. one was a rocky mountain bighorn (ovis canadensis canadensis) and the other was a desert bighorn (ovis canadensis mexicana). both had lesions consistent with those of hemorrhagic disease (hd). epizootic hemorrhagic disease virus (ehdv) type-2 and bluetongue virus (btv) type-17, respectively, were isolated from the sheep tissues. to our knowledge, hd caused by either ehdv or btv infection has not been documented previously in arizo ...200211838210
the incidence of rheumatoid arthritis is predicted by rheumatoid factor titer in a longitudinal population study.rheumatoid factor (rf) is often detected in subjects who do not have rheumatoid arthritis (ra). to determine if the presence of rf is predictive of the development of ra, 2,712 pima indians of arizona, 20 years of age or older, initially without ra, have been observed for up to 19 years with biennial examinations. these included a medical history, physical examination of the joints, radiographs, and rf determination by sheep cell agglutination test. during the study period, 70 new cases of ra de ...19883178905
psoroptic scabies in desert bighorn sheep (ovis canadensis nelsoni) from northwestern arizona.scabies due to infestation by psoroptes ovis was monitored from 1979 through 1981 in nelson's desert bighorn sheep in northwestern arizona. visual examinations for ear lesions and evaluations of ear scrapings were used to assess the prevalence of mites in sheep that were live-captured or killed during the hunting season. the prevalence of psoroptic scabies in live-captured sheep for the years 1979, 1980, and 1981, was 25%, 25%, and 0%, respectively, and was higher in rams (1979, 65%; 1980, 100%) ...19836644933
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