| new distribution record for dermacentor hunteri bishopp (acari: ixodidae). | | 1976 | 940133 |
| serodiagnostic antibody responses to psoroptes sp. infestations in bighorn sheep. | the antibody responses of bighorn sheep (ovis canadensis) infected with psoroptes sp. mites were investigated by enzyme linked immunosorbent assay on western blots of p. cuniculi antigens. serum from 20 psoroptes sp.-infested bighorn sheep (o. canadensis mexicana, o. canadensis nelsoni, o. canadensis canadensis) from new mexico, nevada, california, and idaho reacted strongly with mite antigens ranging from 12 to 34 kd. serum from 35 psoroptes sp.-free bighorn sheep of unknown tick infestation st ... | 1991 | 2023305 |
| 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 ... | 1997 | 9057693 |
| dna sequence variation in dermacentor hunteri and estimated phylogenies of dermacentor spp. (acari: ixodidae) in the new world. | the genus dermacentor is represented by 12 species in the new world. we sequenced a 300-bp portion of the mitochondrial 16s ribosomal dna gene for 28 individual ticks representing 9 of these species and analyzed their phylogenetic relationships. maximum parsimony, distance (neighbor-joining), and maximum likelihood were all used to resolve tree topologies. eleven specimens of dermacentor hunteri bishopp representing populations across the tick's entire geographic range showed negligible genetic ... | 1998 | 9615547 |
| dermacentor hunteri (acari: ixodidae): seasonal variation in questing adults and on-host juvenile stages, and host associations and feeding behavior of larvae and nymphs. | dermacentor hunteri bishopp is the only completely desert adapted tick in the nearctic realm, and chiefly parasitizes desert bighorn sheep (ovis canadensis shaw) as an adult. the remainder of its life history has been unknown. we conducted field investigations in the sonoran desert of the temporal and spatial variation of adult host-seeking ticks and of the host associations of juvenile ticks. additionally, the feeding success of juvenile ticks was assessed in the laboratory. adult ticks were fo ... | 1998 | 9835699 |
| dermacentor hunteri (acari: ixodidae): an experimental vector of anaplasma marginale and a. ovis (rickettsiales: anaplasmataceae) to calves and sheep. | the experimental vector competence of laboratory-reared dermacentor hunteri bishopp for anaplasma marginale theiler and anaplasma ovis lestoquard was evaluated by delayed transfer of male ticks from infected to susceptible holstein calves and from infected to susceptible domestic sheep, respectively. after feeding for 4 or 5 d on rickettsemic acquisition hosts, the ticks were held off the host at 26 degrees c, approximately 93% rh, and a photoperiod of 14:10 (l:d) h for 7 or 8 d, then test fed f ... | 1999 | 10337102 |
| molecular method for discrimination between francisella tularensis and francisella-like endosymbionts. | environmental studies on the distribution of francisella spp. are hampered by the frequency of francisella-like endosymbionts that can produce a misleading positive result. a new, efficient molecular method for detection of francisella tularensis and its discrimination from francisella-like endosymbionts, as well as two variants associated with human disease (unusual f. tularensis strain fnsp1 and f. tularensis subsp. novicida-like strain 3523), is described. the method is highly specific and se ... | 2008 | 18650358 |
| molecular detection of persistent francisella tularensis subspecies holarctica in natural waters. | tularemia, caused by the bacterium francisella tularensis, where f. tularensis subspecies holarctica has long been the cause of endemic disease in parts of northern sweden. despite this, our understanding of the natural life-cycle of the organism is still limited. during three years, we collected surface water samples (n = 341) and sediment samples (n = 245) in two areas in sweden with endemic tularemia. real-time pcr screening demonstrated the presence of f. tularenis lpna sequences in 108 (32% ... | 2010 | 20885922 |
| differences in prevalence of borrelia burgdorferi and anaplasma spp. infection among host-seeking dermacentor occidentalis, ixodes pacificus, and ornithodoros coriaceus ticks in northwestern california. | previous studies revealed that the pacific coast tick (dermacentor occidentalis) is infected occasionally with the agents of lyme disease (borrelia burgdorferi) or human granulocytic anaplasmosis (anaplasma phagocytophilum) and that it is an inefficient experimental vector of b. burgdorferi. the relationship of the pajahuello tick (ornithodoros coriaceus) to each of these bacterial zoonotic agents has not been reported. the primary bridging vector of both bacterial zoonotic agents to humans is t ... | 2010 | 21359090 |
| transstadial transmission of francisella tularensis holarctica in mosquitoes, sweden. | in sweden, human cases of tularemia caused by francisella tularensis holarctica are assumed to be transmitted by mosquitoes, but how mosquito vectors acquire and transmit the bacterium is not clear. to determine how transmission of this bacterium occurs, mosquito larvae were collected in an area where tularemia is endemic, brought to the laboratory, and reared to adults in their original pond water. screening of adult mosquitoes by real-time pcr demonstrated f. tularensis lpna sequences in 14 of ... | 2011 | 21529386 |
| association of different genetic types of francisella-like organisms with the rocky mountain wood tick (dermacentor andersoni) and the american dog tick (dermacentor variabilis) from localities near their northern distributional limits. | dermacentor andersoni and dermacentor variabilis from allopatric and sympatric populations near their northern distributional limits were examined for the presence of francisella species using molecular techniques that targeted 373 bp of the 16s ribosomal rna gene. although there was no evidence for the presence of francisella tularensis in any tick, francisella-like endosymbionts (fles) were common in d. andersoni and d. variabilis adults and immatures. a significantly greater proportion of fem ... | 2011 | 22179251 |
| an insight into the microbiome of the amblyomma maculatum (acari: ixodidae). | the aim of this study was to survey the bacterial diversity of amblyomma maculatum koch, 1844, and characterize its infection with rickettsia parkeri. pyrosequencing of the bacterial 16s rrna was used to determine the total bacterial population in a. maculatum. pyrosequencing analysis identified rickettsia in a. maculatum midguts, salivary glands, and saliva, which indicates successful trafficking in the arthropod vector. the identity of rickettsia spp. was determined based on sequencing the ric ... | 0 | 24605461 |
| molecular surveillance for bartonella, borrelia, and rickettsia species in ticks from desert bighorn sheep ( ovis canadensis) and mule deer ( odocoileus hemionus) in southern california, usa. | : ticks (acari: ixodidae) were collected from 44 desert bighorn sheep ( ovis canadensis) and 10 mule deer ( odocoileus hemionus) in southern california, us during health inspections in 2015-16. specimens were identified and screened by pcr analysis to determine the presence and prevalence of bartonella, borrelia, and rickettsia species in ticks associated with these wild ruminants. none of the 60 dermacentor hunteri and 15 dermacentor albipictus ticks tested yielded positive pcr results. additi ... | 2018 | 28977771 |