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exposure to psoroptes sp. mites is common among bighorn sheep (ovis canadensis) populations in california.sera (n = 806) from 50 populations of bighorn sheep (ovis canadensis) in california (usa) were evaluated for antibodies to psoroptes sp. mites using a kinetic enzyme-linked immunosorbent assay (elisa). test values for each sample were determined to be either positive or negative at each of two elisa cutoff values that provided either 100% sensitivity (low cutoff) or 100% specificity (high cutoff), respectively. one hundred sixty-eight (20.8%) sera were seropositive at the low cutoff value, and 8 ...19921474651
basis for regulation of selenium supplements in animal diets.selenium was discovered 174 yr ago but, until 1957, was given little notice by biologists or was vilified as an agent that caused toxicity in grazing ruminants and horses in the northern great plains. after its status as an essential nutrient was established, se received intense scrutiny, and hundreds of papers have been published dealing with its metabolic functions and the consequences of a se deficiency. because regions of se deficiency are so extensive in the united states, great efforts hav ...19921474028
variation amongst the neutralizing epitopes of bluetongue viruses isolated in the united states in 1979-1981.neutralizing epitopes present on field isolates of bluetongue virus (btv) serotypes 10, 11, 13 and 17 were evaluated with a panel of polyclonal and neutralizing monoclonal antibodies (mabs). a total of 91 field isolates were evaluated, including 15 isolates of btv-10, 29 isolates of btv-11, 26 isolates of btv-13, and 21 isolates of btv-17. the viruses were isolated from cattle, goats, sheep, elk and deer in idaho, louisiana, nebraska and, predominantly, california, in the years 1979, 1980 and 19 ...19921379766
culicoides boydi (diptera: ceratopogonidae): a potential vector of hemorrhagic disease viruses to desert bighorn sheep in southern california.culicoides boydi new species is described from riverside county, ca. a taxonomic key, table of numerical characters, and female wing photographs are presented to distinguish it from the three other species of the culicoides pusillus species group of the subgenus avaritia. brief notes are presented on its biology and distribution and suspected vector potential in the transmission of bluetongue virus to desert bighorn sheep in california.19921334151
hydatid disease transmission in california. a study of the basque connection.a descriptive epidemiologic and anthropologic study was designed to determine by field observation and interview the extent of basque involvement in the sheep industry of california, the nature of the sheep and dog husbandry practices of california basques as they might influence echinococus granulosus transmission, and the "folk knowledge" of hydatid disease possessed by california basques, particularly as it might indicate the early presence of this infection in california and provide evidence ...19751180253
a survey for toxoplasma gondii antibodies in deer and other wildlife on a sheep range.blood samples were obtained from native mammals and birds on a sheep range (hopland field station) in northern california. serums were tested for antibodies to toxoplasma gondii by the indirect hemagglutination test. of 382 deer that were tested from 1964 to 1973, 77 (20%) were seropositive for t gondii. among 36 serums representing 6 species of wild carnivores (badgers, bobcats, coyotes, foxes, raccoons, and skunks), 18 (50%) were seropositive. all of the 5 bobcats tested were seropositive, wit ...19751176348
wyominia tetoni (cestoda: thysanosomatinae) from bighorn sheep in washington.in washington, eitht california bighorn sheep, ovis canadensis californiana, were necropsied to ascertain age and general physical condition. four were found to harbor wyominia tetoni.19751142552
prevalence of toxoplasma gondii antibodies in wild and domestic animals in northern california.wild and domestic animals from 3 geographic-climatologic areas in northern california were tested for antibodies against toxoplasma gondii. a total of 2,796 serum samples representing 37 species of wild mammals, 35 species of wild birds, and 5 species of domestic animals were tested by the indirect hemagglutination test. of 1,174 wild mammal serums tested, 10.8% were positive, which compared with 14.7% of the 1,221 domestic mammal serums. of 229 wild carnivores tested, 45% were seropositive, inc ...1976977457
anthelmintic efficiency of oxfendazole in california lambs.oxfendazole, methyl 5(6)-phenylsulfinyl-2-benzimidazole carbamate, was given by oral drench (5 mg/kg) to california lambs harboring natural infections of gastrointestinal nematodes. ninety-nine percent of adult ostertagia circumcincta, ostertagia trifurcata, trichostrongylus axei, trichostrongylus vitrinus, trichostrongylus colubriformis, nematodirus filicollis, and nematodirus spathiger were removed by the anthelmintic.1977921025
survey of toxoplasma antibodies among sheep in western united states.a survey was conducted to determine the prevalence of toxoplasma antibodies among breeding ewes and among lambs slaughtered for food in western united states. each serum was tested by the indirect hemaglutination method, using microtiter technique. agglutination (greater than or equal to 2 +) at the 1:64 dilution was considered to be a positive reaction. of 2,164 ewes from 18 flocks tested in california, 523 (24%) were seropositive for toxoplasma gondii, with prevalence rates among flocks rangin ...1977604325
external ophthalmomyiasis caused by estrus ovis.external ophthalmomyiasis occurred in a 16-year-old white girl who was infected on catalina island, an endemic area for the sheep bot fly. with the patient under topical anesthesia, we isolated the larva, estrus ovis, removed it with jewelers' forceps, and examined it with light and scanning electron microscopy. the patient responded well to a treatment regimen of corticosteroids and antibiotics.1977596393
california goats with a disease resembling enzootic ataxia or swayback.in a retrospective study typical signs and lesions of enzootic ataxia or swayback were found in 16 young dairy goats from eight widely scattered herds in california. in addition to the constant appearance of chromatolytic neurons in brainstem and spinal cord, and myelin deficiency in certain tracts of the cord, cerebellar hypoplasia was found frequently. liver copper was subnormal in six of nine kids tested. the disease is viewed as a developmental defect in which failure of neuronal perikaryon ...1978566481
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
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