Global ETD Search
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Showing 1 to 19 of 19 for “"Dermacentor variabilis"”.
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Characterization of rickettsial infection dynamics within Dermacentor variabilis and Amblyomma maculatum
… vector/pathogen relationships. To this end, Dermacentor variabilis and Amblyomma maculatum ticks were exposed to R. rickettsii, R. parkeri, R. montanensis, R. amblyommii or R. felis. Rickettsial exposure negatively impacted the fitness of A. maculatum, but not D. variabilis. Transovarial and …
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Lyme disease in Indiana : isolation of Borrelia burgdorferi-like organisms from Dermacentor variabilis
A total of 1,019 Amblyomma, americanum, 479 Dermacentor variabilis, 6 Ixodes texanus, and 1 I. dentatus ticks was collected from mammals and vegetation on three sites in Indiana, from March to October, 1986. Midgut diverticula were examined for the etiological agent, Borrelia burgdorferi, of Lyme …
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THE MICROBIOME AND THE REPRODUCTIVE ECOLOGY OF Dermacentor variabilis AND Dermacentor andersoni IN WESTERN CANADA
… ranges of the Rocky Mountain wood tick, Dermacentor andersoni, and the American dog tick, Dermacentor variabilis, are largely allopatric on the Canadian prairies. Range expansion by D. variabilis to the north and west has resulted in an area of sympatry in south-western Saskatchewan, …
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Identification and Characterization of a Relish-type NF-kB, DvRelish in Dermacentor variabilis, the American Dog Tick
… rickettsii is transmitted by the hard tick Dermacentor variabilis. In response to infection, D. variabilis is known differentially respond to SFG Rickettsia infection. The mechanisms of differential immune induction are currently unknown, and are likely involved in the establishment of …
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Rates of Infection of Amblyomma Americanum and Dermacentor Variabilis By Borrelia Burgdorferi and Borrelia Lonestari in Southwest Missouri
… A total of 433 ticks (Amblyomma americanum and Dermacentor variabilis) were collected during the summer of 2011. DNA was extracted from individual adult ticks and pools of 5 nymphs. A PCR assay was used for the detection of Borrelia spp Tick samples that tested positive for Borrelia spp were …
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Comparative Histology and Histochemistry of the Male Genital Accessory Glands of <em>Dermacentor variabilis</em> (Say and <em>Argas radiatus</em> (Railliet)
… genital accessory gland development in <em>Dermacentor</em> <em>variabilis</em> is completed by the fourth day after initiation of feeding, while that in <em>Argas</em> <em>radiatus</em> (Argasidae) occurs between the first and tenth days after adult ecdysis. <em>D</em>. <em>variabilis</em> …
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Evidence for the Sensory Receptor(s) of the Mounting Sex Pheromone in Two Species of Ixodid Ticks, <i>Dermacentor variabilis</i> (Say) and <i>Dermacentor andersoni</i> Stiles
… MSP (mounting sex pheromone), in <em>D. variabilis</em>, <em>D. andersoni</em> and<em> A. americanum</em> male ticks. In all three tick species, the claw sensilla consists of six anteriorly-directed setae arranged in three symmetrical pairs, two each on the opposite sides of the apotele …
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Evidence for the Role of Ecdysteroids in the Genital Sex Pheromone of Two species of Hard Ticks, <i>Dermacentor variabilis</i> (Say) and <i>Dermacentor andersoni</i> Stiles
… virtually eliminated copulatory behavior in <em>Dermacentor variabilis</em> and<em> D. andersoni</em> males. Extracts from the anterior reproductive tracts (ART) of part-fed (7 days) females restored the male copulatory behavior in conspecific neutered females, suggesting the presence of a …
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The Lyme Disease Spirochete, <i>Borrelia burgdorferi</i>, in Tick Species Collected from Raccoons (<i>Procyon lotor</i>) and Opossums (<i>Didelphis virginiana</i>) Trapped in the Warren and Barren Counties of South Central Kentucky
… spirochete <i>Borrelia burgdorferi</i>, <i>Dermacentor variabilis</i> (a common vector for Rocky Mountain Spotted Fever) also has been shown to be a viable host for this pathogen. The purpose of the present study was to use PCR and DNA sequencing technologies to determine if <i>Borrelia …
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Ticks And Tick-Borne Pathogens In North Dakota
… 1762 individual ticks representing five species: Dermacentor variabilis (1449), Ixodes scapularis (307), Ixodes woodi (3), Ixodes angustus (2), and Amblyomma americanum (1). Dermacentor variabilis were collected in all areas of the state while I. scapularis were restricted to the northeast portion …
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The tick response to Rickettsial dissemination during typical and atypical Rickettsial infection
… rickettsioses. Here we characterized the role of Dermacentor variabilis á-catenin during rickettsial infection in tick ovaries suggesting a role in rickettsial infection in tick ovaries. We demonstrated that the typical nonpathogenic (R. montanensis) and typical pathogenic (R. rickettsii) …
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Abiotic Factors Contributing to the Survival of Three Tick Species in Southeastern Virginia, <i>Amblyomma Americanum</i> (Lone Star Tick), <i>Dermacentor Variabilis</i> (American Dog Tick), and <i>Amblyomma Maculatum</i> (Gulf Coast Tick)
… <em>Amblyomma maculatum</em>, and <em>Dermacentor variabilis</em> are hard-bodied ticks in the Hampton Roads area of southeastern Virginia. This study consisted of two field projects focused on these tick species. To estimate the off-host survival of local tick species, a …
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Mounting Sex Pheromone: A Novel Pheromone Responsible for Mate Recognition in the Ixodidae
… to be the cuticular contact sex pheromone of <em>Dermacentor variabilis</em>. This pheromone which has been termed the Mounting Sex Pheromone (MSP) was also demonstrated to be present on the surface of <em>D</em>. <em>andersoni</em>, <em>Amblyomma maculatum</em> and <em>A. americanum</em>. This …
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Infection Rates of Amblyomma Americanum and Dermacentor Variablis by Francisella Tularensis and Borrelia Lonestari in Southwest Missouri
… bite of an infected Amblyomma americanum tick or Dermacentor variabilis tick, while the primary vector of B. lonestari appears to be only A. americanum. The purpose of this study was to determine the overall infection rates of these two bacterial pathogens and to better establish the risks …
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Investigations into the vector competency of arthropods for two Ehrlichias: Ehrlichia risticii and Cowdria ruminantium
… causative agent of heartwater, are described. <i>Dermacentor variabilis, Rhipicephalus sanguineus, Amblyomma americanum and Ixodes scapularis</i> ticks were investigated for their ability to acquire and transmit PHF. Larval and nymphal ticks were exposed to <i>E. risticii</i> by feeding on mice …
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A deeper look into the morphology and receptors found in the tick (Acari: Ixodidae) chemoperception structure, the Haller's organ
… Ixodes scapularis, Amblyomma americanum, and Dermacentor variabilis. Possible differences in morphology between and within these species and between males and females for each species were observed using environmental scanning electron microscopy (ESEM). Analyses using geometric morphometrics …
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Determination of the possible role of arthropods as vectors for "Potomac Horse Fever" in equines
… Ceratopogonidae), (4) C. variipennis, and (5) Dermacentor variabilis (Acari: Ixodidae). These five arthropod species were given status as potential vectors because they were collected feeding on horses just prior to and throughout the PHF season. Simulium jenningsi and D. variabilis have the …
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High resolution modeling of tick density and detection of Rickettsia spp. in Dermacentor spp. ticks at Turnbull National Wildlife Refuge, WA
<p>The tick species Dermacentor andersoni and Dermacentor variabilis are known vectors of pathogens. One such pathogen is the bacteria Rickettsia rickettsii, which causes Rocky Mountain spotted fever. The detection of this bacterium in ticks at Turnbull National Wildlife Refuge (TNWR) indicates a …
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Surveillance for hard ticks of public health concern in Illinois: methods, application, and education
… main IL vector species (Amblyomma americanum, Dermacentor variabilis, and I. scapularis). In 2018, we began the Illinois Tick Inventory Collaboration Network (I-TICK), a collaboration of academic, government, and community scientists, to gather information on the ticks of public health concern …