Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 23 for “"Amblyomma americanum"”.
-
Tick Control Methods for <i>Amblyomma americanum</i> in Virginia: Applications and Modeling
… currently exists. The lone star tick, <em>Amblyomma americanum</em>, is an aggressive human-biting tick and vector of several pathogens which effect both humans and other animals. Standard control methods do not work as well for<em> A. americanum</em> as they do for the more commonly …
-
Infection Rates of Amblyomma Americanum and Dermacentor Variablis by Francisella Tularensis and Borrelia Lonestari in Southwest Missouri
… to humans through the 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 …
-
Rates of Infection of Amblyomma Americanum and Dermacentor Variabilis By Borrelia Burgdorferi and Borrelia Lonestari in Southwest Missouri
… from 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 …
-
Characterization of Hemocytes in Amblyomma americanum and Investigation of TRAF6’s Role in Proliferation of Hemocytes in Response to Infection
<p><em>Amblyomma americanum</em> is a medically important vector in the southeast United States. Cellular and molecular aspects of the immune system of this species were examined. To investigate cellular processes, hemocytes produced in response to gram-negative infection were characterized …
-
Epidemiologic studies of hard tick-associated illness in the United States
… clinical characteristics, and etiology of Amblyomma americanum-associated illness and to identify associated risk factors. Amblyomma americanum is an aggressive human biting tick associated with a Lyme disease-like illness of unknown etiology. Study findings suggested that a variety of …
-
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)
<p><em>Amblyomma americanum</em>, <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 …
-
Ecology and Climate Tolerance of Emerging Tick Disease Vectors in Central Appalachia/Southwestern Virginia
… invasive, including Haemaphysalis longicornis, Amblyomma americanum, and Amblyomma maculatum, were examined through a combination of laboratory and field experiments. Amblyomma americanum and H. longicornis nymphal ticks had a lower supercooling temperature than adult ticks, suggesting their …
-
Molecular Detection and Characterization of Rickettsia sp. in Hard Ticks Collected in Nacogdoches, Texas
… were tested with these markers and out of 13 <em>Amblyomma americanum </em>ticks 4 were positive, 9 <em>Dermacentor variabillis </em>ticks 1 was positive, 6 <em>Amblyomma maculatum </em>ticks 4 were positive, and out of 19 <em>Ixodes scapularis </em>ticks 12 were positive.</p>
-
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 …
-
Elucidating the Molecular Function of Reprolysin Metalloproteases in Tick-Host-Pathogen Interaction
… Previous work with the <em>Amblyomma americanum</em> sialotranscriptome identified over 40 metalloproteases secreted in the saliva during the ticks’ feeding. <em>A. americanum</em> is a carrier of multiple diseases, including <em>Ehrlichia chaffeensis</em>, the causative …
-
Host-Dependent Expression, Transcriptional Regulation and Protection of Ehrlichia chaffeensis Tandem Repeat Proteins
… is transmitted by the lone star tick, Amblyomma americanum, and replicates in mononuclear phagocytes in mammalian hosts. The major immunoreactive proteins of E. chaffeensis include a group of tandem repeat proteins (TRPs) that are involved in various molecular strategies to reprogram …
-
Investigations into the vector competency of arthropods for two Ehrlichias: Ehrlichia risticii and Cowdria ruminantium
… agent of Potomac horse fever (PHF) and <i>Amblyomma variegatum</i> for <i>Cowdria ruminantium</i>, causative agent of heartwater, are described. <i>Dermacentor variabilis, Rhipicephalus sanguineus, Amblyomma americanum and Ixodes scapularis</i> ticks were investigated for their ability to …
-
A deeper look into the morphology and receptors found in the tick (Acari: Ixodidae) chemoperception structure, the Haller's organ
… North American tick species: 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 …
-
The role of the P28 multigene family in the pathogenesis of Ehrlichia chaffeensis infection.
… is transmitted by lone star ticks, <i>Amblyomma americanum</i>, and is not transmitted transovarially, but is maintained in the environment by persistent infection of animal hosts. <i>E. chaffeensis</i> causes the emerging infectious disease, human monocytic ehrlichiosis (HME), a …
-
Ticks And Tick-Borne Pathogens In North Dakota
… 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 of the state. This provided sufficient evidence that I. scapularis have established populations …
-
Tick abundance and microorganism diversity in the 11 counties comprising the Choctaw Nation of Oklahoma
… in human cases from the region. Rickettsia amblyommatis (6.2%) was the most frequently detected microorganism in Amblyomma americanum, while ‘Candidatus Rickettsia andeanae’ (22.2%) was detected in Amblyomma maculatum and Rickettsia buchneri (5.9%) was detected in Ix. scapularis. In A. …
-
Determining the Prevalence and Distribution of Tick-Borne Pathogens in Southeastern Virginia and Exploring the Transmission Dynamics of Rickettsia Parkeri in Amblyomma Maculatum
… of Rickettsia parkeri within its vector, Amblyomma maculatum. Although some rickettsiae are transovarially transmitted in ticks, little is known about the frequency and efficiency of this transmission route, and nothing is known regarding the transmission strategy of R. parkeri in A. …
-
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
… from raccoons; <i>Dermacentor variabilis, Amblyomma americanum</i>, and <i>Ixodes sp</i>. <i>Dermacentor variabilis</i> was the only tick species found on opossums. Twenty-five percent (163/642) of the tick DNA samples were positive for <i>Borrelia burgdorferi</i>. Prevalence of <i>B. …
-
A Metagenomic Study of The Tick Midgut
… illness that occurs following bites by <em>Amblyomma americanum</em>, the lone-star tick. Clinical symptoms include a bull’s eye rash similar to the erythema migrans lesions of Lyme disease, as well as fever and joint pains. Lyme disease is caused by <em>Borrelia burgdorferi</em> and related …
Page 1 of 2