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Ornithodoros

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https://www.readbyqxmd.com/read/28426405/molecular-evidence-and-additional-morphological-characters-to-distinguish-ornithodoros-brodyi-and-ornithodoros-yumatensis-ixodida-argasidae-in-their-different-developmental-stages
#1
Carmen Guzmán-Cornejo, Luis García-Prieto, Andrea Rebollo-Hernández, José M Venzal, Santiago Nava, Sokani Sánchez-Montes
Ornithodoros brodyi and Ornithodoros yumatensis are two species distributed in the Americas and associated with bats and caves. Both species have similar morphology, and the diagnostic traits of adults have not been detailed or illustrated accurately. In this study, the independence of both species is validated on the basis of molecular evidence (using partial sequences of 16S rDNA gene), and the morphological differences between them (dentition of the hypostome and traits of individual mammillae) are confirmed through light and scanning electron microscopy...
June 1, 2017: Acta Parasitologica
https://www.readbyqxmd.com/read/28399292/an-in-vitro-blood-feeding-method-revealed-differential-borrelia-turicatae-spirochaetales-spirochaetaceae-gene-expression-after-spirochete-acquisition-and-colonization-in-the-soft-tick-ornithodoros-turicata-acari-argasidae
#2
Girish Neelakanta, Hameeda Sultana, Daniel E Sonenshine, Richard T Marconi
In the Midwestern, Southwestern, and Southern part of the United States, the soft tick Ornithodoros turicata transmits the spirochete Borrelia turicatae, the causative agent of relapsing fever in humans. In this study, we report a simplified and an efficient method of in vitro feeding to evaluate O. turicata-B. turicatae interactions. Both nymphal and adult female ticks successfully acquired spirochetes upon in vitro feeding on the B. turicatae-infected blood. We also noted transstadial transmission of spirochetes to adult ticks that were molted from nymphs fed on B...
March 1, 2017: Journal of Medical Entomology
https://www.readbyqxmd.com/read/28399204/detection-of-a-novel-rickettsia-from-leptotrombidium-scutellare-mites-acari-trombiculidae-from-shandong-of-china
#3
Yuting Huang, Li Zhao, Zhentang Zhang, Miaomiao Liu, Zaifeng Xue, Dongqiang Ma, Xifeng Sun, Yue Sun, Chuanmin Zhou, Xiangrong Qin, Yelei Zhu, Wenqian Li, Hao Yu, Xue-Jie Yu
Leptotrombidium scutellare mites, the vector of Orientia tsutsugamushi, have rarely been reported to associate with Rickettsia species. Three hundred nineteen chiggers were collected from the ears of 32 rodents captured in Huangdao District of Qingdao City, China, in October 2015. The chigger samples were tested for Rickettsia, severe fever with thrombocytopenia syndrome virus, and hantavirus by PCR or RT-PCR amplification. All mites were classified morphologically and molecularly as L. scutellare chiggers...
February 17, 2017: Journal of Medical Entomology
https://www.readbyqxmd.com/read/28286142/ixodoidea-of-the-western-palaearctic-a-review-of-available-literature-for-identification-of-species
#4
REVIEW
Agustín Estrada-Peña, Miriam Pfäffle, Gad Baneth, Gabriela Kleinerman, Trevor N Petney
We aim to produce a review of the most important literature references necessary for the identification of ticks of the families Ixodidae and Argasidae in Europe and northern Africa (i.e. the Western Palaearctic region). The purpose of this paper is to pinpoint a set of critically selected papers that contain reliable information on morphology, taxonomic keys, and comparative discussions which are critical for the identification of the ticks reported in the target region. When necessary, comments are provided on the systematic position of a species, or on suitable papers already addressing the issue...
March 6, 2017: Ticks and Tick-borne Diseases
https://www.readbyqxmd.com/read/28268195/-candidatus-rickettsia-nicoyana-a-novel-rickettsia-species-isolated-from-ornithodoros-knoxjonesi-in-costa-rica
#5
Rolando D Moreira-Soto, Andrés Moreira-Soto, Eugenia Corrales-Aguilar, Ólger Calderón-Arguedas, Adriana Troyo
Rickettsiae are intracellular bacteria commonly associated with hematophagous arthropods. Most of them have been described in hard ticks, but some have been found in soft ticks. Here we report the detection and isolation of a new Rickettsia from Ornithodoros knoxjonesi larvae collected from Balantiopteryx plicata (Emballonuridae) in Nicoya, Costa Rica. Two ticks were processed to detect Rickettsia spp. genes gltA, ompA, ompB, and htrA by PCR. Part of the macerate was also inoculated into Vero E6 and C6/36 cell lines, and cells were evaluated by Giménez stain, indirect immunofluorescence assay (IFA), and PCR...
February 27, 2017: Ticks and Tick-borne Diseases
https://www.readbyqxmd.com/read/28258298/complement-factor-5-blockade-reduces-porcine-myocardial-infarction-size-and-improves-immediate-cardiac-function
#6
Soeren E Pischke, A Gustavsen, H L Orrem, K H Egge, F Courivaud, H Fontenelle, A Despont, A K Bongoni, R Rieben, T I Tønnessen, M A Nunn, H Scott, H Skulstad, A Barratt-Due, T E Mollnes
Inhibition of complement factor 5 (C5) reduced myocardial infarction in animal studies, while no benefit was found in clinical studies. Due to lack of cross-reactivity of clinically used C5 antibodies, different inhibitors were used in animal and clinical studies. Coversin (Ornithodoros moubata complement inhibitor, OmCI) blocks C5 cleavage and binds leukotriene B4 in humans and pigs. We hypothesized that inhibition of C5 before reperfusion will decrease infarct size and improve ventricular function in a porcine model of myocardial infarction...
May 2017: Basic Research in Cardiology
https://www.readbyqxmd.com/read/28238286/a-13-year-old-girl-with-pancytopenia-at-the-presentation-of-a-borrelia-hispanica-infection-a-case-report-and-review-of-the-literature
#7
Irmin Leen, Peggy Bruynseels, Benoît Kabamba Mukadi, Mark van Oort, Machiel van den Akker
BACKGROUND: It is not uncommon that a child with a febrile illness of unknown etiology is admitted to the hospital. When the complete blood count reveals a pancytopenia, the diagnostic process can be a real challenge. CASE PRESENTATION: A 13-year girl of Arab-Berber descent presented with abdominal pain and fever after a holiday in northwestern Morocco. A complete blood count revealed a pancytopenia and blood smear test results revealed spirochetes. Borrelia hispanica was identified by sequencing the 16S ribosomal ribonucleic acid gene...
February 27, 2017: Journal of Medical Case Reports
https://www.readbyqxmd.com/read/28196664/new-records-of-ornithodoros-puertoricensis-fox-1947-ixodida-argasidae-parasitizing-humans-in-rural-and-urban-dwellings-panama
#8
Sergio E Bermúdez, Eduardo Castillo, Tyler D Pohlenz, Alexander Kneubehl, Aparna Krishnavajhala, Lillian Domínguez, Antonio Suárez, Job E López
The presence of ticks inside human constructions was evaluated in two localities from Colon province (Charco La Piedra and Espinar) and one from Panama province (Ancon, City of Panama). In two of houses, eight people from Charco La Piedra and one from Ancón reported "insect bites," which produced blisters for several weeks. The investigation resulted in the collection of argasid ticks, which were identified by morphology and sequencing the 16s ribosomal RNA gene, and later evaluated for the presence of relapsing fever Borrelia DNA...
February 5, 2017: Ticks and Tick-borne Diseases
https://www.readbyqxmd.com/read/28154563/host-immune-evasion-by-lyme-and-relapsing-fever-borreliae-findings-to-lead-future-studies-for-borrelia-miyamotoi
#9
REVIEW
Brandee L Stone, Catherine A Brissette
The emerging pathogen, Borrelia miyamotoi, is a relapsing fever spirochete vectored by the same species of Ixodes ticks that carry the causative agents of Lyme disease in the US, Europe, and Asia. Symptoms caused by infection with B. miyamotoi are similar to a relapsing fever infection. However, B. miyamotoi has adapted to different vectors and reservoirs, which could result in unique physiology, including immune evasion mechanisms. Lyme Borrelia utilize a combination of Ixodes-produced inhibitors and native proteins [i...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28150885/blood-feeding-of-ornithodoros-turicata-larvae-using-an-artificial-membrane-system
#10
H J Kim, S Filatov, J E Lopez, A A Pérez DE León, P D Teel
An artificial membrane system was adapted to feed Ornithodoros turicata (Ixodida: Argasidae) larvae from a laboratory colony using defibrinated swine blood. Aspects related to larval feeding and moulting to the first nymphal instar were evaluated. A total of 55.6% of all larvae exposed to the artificial membrane in two experimental groups fed to repletion and 98.0% of all fed larvae moulted. Mortality rates of first instar nymphs differed significantly depending on the sorting tools used to handle engorged larvae (χ(2)  = 35...
February 2, 2017: Medical and Veterinary Entomology
https://www.readbyqxmd.com/read/28064411/the-tick-acari-ixodidae-fauna-of-herald-s-beacon-islet-australia
#11
Mackenzie L Kwak, Kate Mintram
A rare opportunity to travel to Herald's Beacon Islet with permission from the Australian government to collect ticks allowed for a survey of the tick fauna of the island to be undertaken for the first time. The avian fauna of the island, which serve as hosts, was also recorded and includes one new species record for the island. The seabird soft tick Ornithodoros capensis Neumann and the seabird hard tick Amblyomma loculosum Neumann were found to be present on the island. Images of the ticks present on the island are presented along with morphological characters for their identification...
January 2017: Experimental & Applied Acarology
https://www.readbyqxmd.com/read/28040777/genome-report-identification-and-validation-of-antigenic-proteins-from-pajaroellobacter-abortibovis-using-de-novo-genome-sequence-assembly-and-reverse-vaccinology
#12
Bryan T Welly, Michael R Miller, Jeffrey L Stott, Myra T Blanchard, Alma D Islas-Trejo, Sean M O Rourke, Amy E Young, Juan F Medrano, Alison L Van Eenennaam
Epizootic bovine abortion (EBA), or "foothill abortion", is the leading cause of beef cattle abortion in California and has also been reported in Nevada and Oregon. In the 1970's, the soft-shelled tick Ornithodoros coriaceus, or "pajaroello tick", was confirmed as the disease-transmitting vector. In 2005, a novel Deltaproteobacterium was discovered as the etiologic agent of EBA (aoEBA), recently named Pajaroellobacter abortibovis This organism cannot be grown in culture using traditional microbiological techniques; it can only be grown in experimentally-infected severe combined immunodeficient (SCID) mice...
December 30, 2016: G3: Genes—Genomes—Genetics
https://www.readbyqxmd.com/read/27986725/imaging-of-borrelia-turicatae-producing-the-green-fluorescent-protein-reveals-persistent-colonization-of-the-ornithodoros-turicata-midgut-and-salivary-glands-from-nymphal-acquisition-through-transmission
#13
Aparna Krishnavajhala, Hannah K Wilder, William K Boyle, Ashish Damania, Justin A Thornton, Adalberto A Pérez de León, Pete D Teel, Job E Lopez
Relapsing fever (RF) spirochetes colonize and are transmitted to mammals primarily by Ornithodoros ticks, and little is known regarding the pathogen's life cycle in the vector. To further understand vector colonization and transmission of RF spirochetes, Borrelia turicatae expressing a green fluorescent protein (GFP) marker (B. turicatae-gfp) was generated. The transformants were evaluated during the tick-mammal infectious cycle, from the third nymphal instar to adult stage. B. turicatae-gfp remained viable for at least 18 months in starved fourth-stage nymphal ticks, and the studies indicated that spirochete populations persistently colonized the tick midgut and salivary glands...
March 1, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/27982297/ticks-parasitizing-bats-mammalia-chiroptera-in-the-caatinga-biome-brazil
#14
Hermes Ribeiro Luz, Sebastián Muñoz-Leal, Juliana Cardoso de Almeida, João Luiz Horacio Faccini, Marcelo Bahia Labruna
In this paper, the authors report ticks parasitizing bats from the Serra das Almas Natural Reserve (RPPN) located in the municipality of Crateús, state of Ceará, in the semiarid Caatinga biome of northeastern Brazil. The study was carried out during nine nights in the dry season (July 2012) and 10 nights in the rainy season (February 2013). Only bats of the Phyllostomidae and Mormoopidae families were parasitized by ticks. The species Artibeus planirostris and Carolia perspicillata were the most parasitized...
October 2016: Revista Brasileira de Parasitologia Veterinária, Brazilian Journal of Veterinary Parasitology
https://www.readbyqxmd.com/read/27832805/host-associations-and-genomic-diversity-of-borrelia-hermsii-in-an-endemic-focus-of-tick-borne-relapsing-fever-in-western-north-america
#15
Tammi L Johnson, Robert J Fischer, Sandra J Raffel, Tom G Schwan
BACKGROUND: An unrecognized focus of tick-borne relapsing fever caused by Borrelia hermsii was identified in 2002 when five people became infected on Wild Horse Island in Flathead Lake, Montana. The terrestrial small mammal community on the island is composed primarily of pine squirrels (Tamiasciurus hudsonicus) and deer mice (Peromyscus maniculatus), neither of which was known as a natural host for the spirochete. Thus a 3-year study was performed to identify small mammals as hosts for B...
November 10, 2016: Parasites & Vectors
https://www.readbyqxmd.com/read/27729267/linking-morphometric-and-genetic-divergence-with-host-use-in-the-tick-complex-ornithodoros-capensis-sensu-lato
#16
Marlène Dupraz, Céline Toty, Valérie Noël, Agustin Estrada-Peňa, Jacob González-Solís, Thierry Boulinier, Jean-Pierre Dujardin, Karen D McCoy
Host specific adaptations in parasites can lead to the divergence of conspecific populations. However, this divergence can be difficult to measure because morphological changes may not be expressed or because obvious changes may simply reflect phenotypic plasticity. Combining both genetic and phenotypic information can enable a better understanding of the divergence process and help identify the underlying selective forces, particularly in closely-related species groups. Here, we link genetic and morphometric data to understand divergence patterns within the Ornithodoros (Carios) capensis complex, a group of soft ticks (Argasidae) exploiting colonial seabirds across the globe...
December 2016: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/27639933/rickettsia-lusitaniae-associated-with-ornithodoros-yumatensis-acari-argasidae-from-two-caves-in-yucatan-mexico
#17
Sokani Sánchez-Montes, Carmen Guzmán-Cornejo, Yecenia Martínez-Nájera, Ingeborg Becker, José M Venzal, Marcelo B Labruna
The genus Rickettsia includes obligate intracellular bacteria transmitted by several hematophagous arthropods such as ticks, fleas and sucking lice. In particular hard ticks (Ixodidae) have been cited as the main vectors of pathogenic rickettsiae in Mexico. However, there have been only two records of a single Rickettsia species associated with Mexican soft ticks (Argasidae). In this study, we searched for rickettsial DNA in argasid ticks (13 adults and eight nymphs of Ornithodoros yumatensis) from two bat caves in the state of Yucatan, Mexico...
October 2016: Ticks and Tick-borne Diseases
https://www.readbyqxmd.com/read/27639932/new-rickettsia-species-in-soft-ticks-ornithodoros-hasei-collected-from-bats-in-french-guiana
#18
Djamel Tahir, Cristina Socolovschi, Jean-Lou Marié, Gautier Ganay, Jean-Michel Berenger, Jean-Michel Bompar, Denis Blanchet, Marie Cheuret, Oleg Mediannikov, Didier Raoult, Bernard Davoust, Philippe Parola
In French Guiana, located on the northeastern coast of South America, bats of different species are very numerous. The infection of bats and their ticks with zoonotic bacteria, especially Rickettsia species, is so far unknown. In order to improve knowledge of these zoonotic pathogens in this French overseas department, the presence and diversity of tick-borne bacteria was investigated with molecular tools in bat ticks. In the beginning of 2013, 32 bats were caught in Saint-Jean-du-Maroni, an area close to the coast of French Guiana, and the ticks of these animals were collected...
October 2016: Ticks and Tick-borne Diseases
https://www.readbyqxmd.com/read/27625415/physiological-characterization-of-the-hematophagy-of-ornithodoros-rostratus-acari-argasidae-on-live-hosts
#19
Gabriel Cerqueira Alves Costa, Adriana Coelho Soares, Marcos Horácio Pereira, Nelder Figueiredo Gontijo, Maurício Roberto Viana Sant'Anna, Ricardo Nascimento Araujo
Ornithodoros rostratus is an argasid tick and its importance is based on its hematophagy and the resulting transmission of pathogens such as Rickettsia rickettsii and Coxiella burnetii to its vertebrate hosts. In the face of a lack of physiological studies related to hematophagy in argasid ticks, this paper aims to identify and characterize the events that occur throughout the feeding by O. rostratus on live hosts. Electrical signals and alterations on the feeding site were monitored using intravital microscopy and electromyography...
November 15, 2016: Journal of Experimental Biology
https://www.readbyqxmd.com/read/27598771/pasylated-coversin-a-c5-specific-complement-inhibitor-with-extended-pharmacokinetics-shows-enhanced-anti-hemolytic-activity-in-vitro
#20
Nadine Kuhn, Christoph Q Schmidt, Martin Schlapschy, Arne Skerra
The Ornithodoros moubata Complement Inhibitor (OmCI) binds complement component 5 (C5) with high affinity and, thus, selectively prevents proteolytic activation of the terminal lytic complement pathway. A recombinant version of OmCI (also known as Coversin and rEV576) has proven efficacious in several animal models of complement-mediated diseases and successfully completed a phase Ia clinical trial. Coversin is a small 17 kDa lipocalin protein which has a very short plasma half-life if not bound to C5; therefore, the drug requires frequent dosing...
September 26, 2016: Bioconjugate Chemistry
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