Ornithodoros
Mostrando 13-24 de 27 artigos, teses e dissertações.
-
13. Recovery of Relapsing Fever Spirochetes from Ornithodoros turicata (Duges), 1876, in California
-
14. Isolation and Characterization of Borrelia hermsii Associated with Two Foci of Tick-Borne Relapsing Fever in California
Relapsing fever, caused by the spirochete Borrelia hermsii and transmitted by the soft tick Ornithodoros hermsi, is endemic in many rural mountainous areas of California. Between 1996 and 1998, 12 cases of relapsing fever associated with two exposure sites in northern California were investigated. Follow-up at exposure sites included collection of soft ticks
American Society for Microbiology.
-
15. African Swine Fever Virus Infection in the Argasid Host, Ornithodoros porcinus porcinus
The pathogenesis of African swine fever virus (ASFV) infection in Ornithodoros porcinus porcinus was examined in nymphal ticks infected with the ASFV isolate Chiredzi/83/1. At times postinfection (p.i.) ranging from 6 h to 290 days, ticks or dissected tick tissues were titrated for virus and examined ultrastructurally for evidence of virus replication. The A
American Society for Microbiology.
-
16. African Swine Fever Virus Multigene Family 360 Genes Affect Virus Replication and Generalization of Infection in Ornithodoros porcinus Ticks
Recently, we reported that African swine fever virus (ASFV) multigene family (MGF) 360 and 530 genes are significant swine macrophage host range determinants that function by promoting infected-cell survival. To examine the function of these genes in ASFV's arthropod host, Ornithodoros porcinus porcinus, an MGF360/530 gene deletion mutant (Pr4Δ35) was const
American Society for Microbiology.
-
17. Genetic Characteristics of Borrelia coriaceae Isolates from the Soft Tick Ornithodoros coriaceus (Acari: Argasidae)
Two Borrelia isolates (CA434 and CA435) cultured from the soft tick Ornithodoros coriaceus were analyzed by contour-clamped homogeneous electric field gel electrophoresis of unrestricted and ApaI-restricted DNA, standard electrophoresis of BamHI- and HindIII-restricted DNA, Southern hybridization, restriction fragment length polymorphism and sequencing of th
American Society for Microbiology.
-
18. Susceptibility of Various Species of Rodents to the Relapsing Fever Spirochete, Borrelia hermsii
In a study to determine susceptibility to Borrelia hermsii of various rodents commonly found in or near places where human cases of relapsing fever occurred, chipmunks (Eutamias amoenus), pine squirrels (Tamiasciurus hudsonicus richardsoni), flying squirrels (Glaucomys sabrinus), Columbian ground squirrels (Spermophilus columbianus columbianus), golden-mantl
-
19. African Swine Fever Virus Replication in the Midgut Epithelium Is Required for Infection of Ornithodoros Ticks
Although the Malawi Lil20/1 (MAL) strain of African swine fever virus (ASFV) was isolated from Ornithodoros sp. ticks, our attempts to experimentally infect ticks by feeding them this strain failed. Ten different collections of Ornithodorus porcinus porcinus ticks and one collection of O. porcinus domesticus ticks were orally exposed to a high titer of MAL.
American Society for Microbiology.
-
20. Identification of the tick-borne relapsing fever spirochete Borrelia hermsii by using a species-specific monoclonal antibody.
Borrelia hermsii causes a relapsing fever in humans and is one of several species of tick-borne spirochetes known to occur in the western United States. Spirochetes observed in the peripheral blood of patients acutely ill have been presumptively identified in the past by the geographic location of exposure and the probable species of tick vector. We describe
-
21. Epidermis as the source of ecdysone in an argasid tick.
Various tissues excised from nymphs of the tick Ornithodoros parkeri at the time of epicuticle deposition were incubated in vitro. The medium from the incubation of salivary glands, coxal glands, synganglion, testis, midgut, and fat body associated with tracheal trunk showed little or no ecdysteroid immunoreactivity. Only medium from incubated integument con
-
22. The ornithodorin-thrombin crystal structure, a key to the TAP enigma?
Ornithodorin, isolated from the blood sucking soft tick Ornithodoros moubata, is a potent (Ki = 10(-12) M) and highly selective thrombin inhibitor. Internal sequence homology indicates a two domain protein. Each domain resembles the Kunitz inhibitor basic pancreatic trypsin inhibitor (BPTI) and also the tick anticoagulant peptide (TAP) isolated from the same
-
23. Molecular Identification of a Novel Deltaproteobacterium as the Etiologic Agent of Epizootic Bovine Abortion (Foothill Abortion)
Epizootic bovine abortion (EBA) is endemic in California's coastal range and the foothill regions of the Sierra Nevada, where it has been the primary diagnosed cause of abortion in beef cattle for >50 years. Investigation of these losses has defined a specific fetal syndrome characterized by late-term abortion or birth of weak or dead calves. Although the un
American Society for Microbiology.
-
24. GlpQ: an antigen for serological discrimination between relapsing fever and Lyme borreliosis.
Tick-borne relapsing fever is caused by numerous Borrelia species maintained in nature by Ornithodoros tick-mammal cycles. Serological confirmation is based on either an immunofluorescence assay or an enzyme-linked immunosorbent assay using whole cells or sonicated Borrelia hermsii as the antigen. However, antigenic variability of this bacterium's outer surf