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https://www.readbyqxmd.com/read/27920653/intestinal-bacterial-infection-diagnosed-by-histological-examination-of-endoscopic-biopsy-specimens
#1
Michiko Yuki, Yuko Emoto, Katsuhiko Yoshizawa, Takashi Yuri, Airo Tsubura
Intestinal spirochetosis (IS) in humans is characterized by spirochetal microorganisms attached to the luminal surface of the colonic epithelium. In the present case, attached organisms appeared as 3- to 4 μm-thick (average thickness, 3.4 μm) basophilic fringes or haze in HE-stained endoscopic biopsy specimens. The basophilic fringes were clearly labeled by Treponema pallidum antiserum. Because IS is relatively rare in developed countries, thin basophilic fringes characteristic of IS are readily overlooked...
September 2016: Case Reports in Gastroenterology
https://www.readbyqxmd.com/read/27920211/outer-membrane-proteins-bb0405-and-bb0406-are-immunogenic-but-only-bb0405-is-required-for-borrelia-burgdorferi-infection
#2
Binu Shrestha, Melisha R Kenedy, Darrin R Akins
We recently identified the Borrelia burgdorferi outer membrane protein (OMP) BB0406 and found that the gene encoding this OMP was co-transcribed with the gene encoding the OMP BB0405. Interestingly, BB0405 and BB0406 share 59% similarity and are grouped into the same B. burgdorferi paralogous gene family. Given their overall similarity, it is plausible that both OMPs have similar or overlapping functions in this pathogenic spirochete. BB0405 has recently been shown to be required for mammalian infection despite the observations that BB0405 is poorly immunogenic and not recognized during mouse or human infection...
December 5, 2016: Infection and Immunity
https://www.readbyqxmd.com/read/27914958/comparative-analysis-of-motility-and-other-properties-of-treponema-denticola-strains
#3
Keiji Nagano, Yoshiaki Hasegawa, Yasuo Yoshida, Fuminobu Yoshimura
The periodontitis-associated pathogen Treponema denticola is a spirochetal bacterium that swims by rotating its cell body like a corkscrew using periplasmic flagella. We compared physiologic and pathogenic properties, including motility, in four strains of T. denticola. Phase-contrast microscopy showed differential motility between the strains; ATCC 35404 showed the highest motility, followed by ATCC 33521, and the remaining two strains (ATCC 35405 and ATCC 33520) showed the lowest motility. Transmission electron microscopy showed that the low motility strains exhibited extracellular flagellar protrusions resulting from elongated flagella...
November 30, 2016: Microbial Pathogenesis
https://www.readbyqxmd.com/read/27913725/in-vivo-expression-technology-and-5-end-mapping-of-the-borrelia-burgdorferi-transcriptome-identify-novel-rnas-expressed-during-mammalian-infection
#4
Philip P Adams, Carlos Flores Avile, Niko Popitsch, Ivana Bilusic, Renée Schroeder, Meghan Lybecker, Mollie W Jewett
Borrelia burgdorferi, the bacterial pathogen responsible for Lyme disease, modulates its gene expression profile in response to the environments encountered throughout its tick-mammal infectious cycle. To begin to characterize the B. burgdorferi transcriptome during murine infection, we previously employed an in vivo expression technology-based approach (BbIVET). This identified 233 putative promoters, many of which mapped to un-annotated regions of the complex, segmented genome. Herein, we globally identify the 5' end transcriptome of B...
December 1, 2016: Nucleic Acids Research
https://www.readbyqxmd.com/read/27907102/an-investigation-into-the-etiological-agents-of-swine-dysentery-in-australian-pig-herds
#5
Tom La, Nyree D Phillips, David J Hampson
Swine dysentery (SD) is a mucohemorrhagic colitis, classically seen in grower/finisher pigs and caused by infection with the anaerobic intestinal spirochete Brachyspira hyodysenteriae. More recently, however, the newly described species Brachyspira hampsonii and Brachyspira suanatina have been identified as causing SD in North America and/or Europe. Furthermore, there have been occasions where strains of B. hyodysenteriae have been recovered from healthy pigs, including in multiplier herds with high health status...
2016: PloS One
https://www.readbyqxmd.com/read/27883377/borrelia-burgdorferi-%C3%A2-morphological-structure-and-motility-as-adaptation-for-transmission-and-survival-in-the-habitat-of-a-tick-vertebrate-setup
#6
Paweł Penza, Anna Moniuszko-Malinowska, Piotr Czupryna, Sławomir Pancewicz, Joanna Zajkowska
Lyme borreliosis is a multisystem chronic disease caused by Borrelia burgdorferi sensu lato (s.l.) spirochete transmitted by Ixodes. This bacterium has a remarkable ability to survive in tick-vertebrate setup. Its infection causes diagnostic and clinical difficulties. It was distinguished as a separate disease entity over 30 years ago. Observations made by Steere et al. proved to be a milestone since they found correlation between the occurrence of skin and joint lesions with tick bites. Further studies showed that the disease affects not only joints and skin, but also nervous and circulatory systems...
2016: Przegla̧d Epidemiologiczny
https://www.readbyqxmd.com/read/27875949/treponema-iron-and-neurodegeneration
#7
A Jolivet-Gougeon, M Bonnaure Mallet
Spirochetes are suspected to be linked to the genesis of neurological diseases, including neurosyphillis or neurodegeneration (ND). Impaired iron homeostasis has been implicated in loss of function in several enzymes requiring iron as a cofactor, formation of toxic oxidative species, inflammation and elevated production of beta-amyloid proteins. This review proposes to discuss the link that may exist between the involvement of Treponema spp. in the genesis or worsening of ND, and iron dyshomeostasis. Proteins secreted by Treponema can act directly on iron metabolism, with hemin binding ability (HbpA and HbpB) and iron reductase able to reduce the central ferric iron of hemin, iron-containing proteins (rubredoxin, neelaredoxin, desulfoferrodoxin metalloproteins, bacterioferritins etc)...
November 21, 2016: Current Alzheimer Research
https://www.readbyqxmd.com/read/27870540/lyme-disease-in-poland-in-2014
#8
Iwona Paradowska-Stankiewicz, Irena Chrześcijańska
INTRODUCTION: Lyme disease is the most common tick-borne disease, caused by spirochetes of the Borrelia genus transmitted by ticks of the Ixodes genus. Infection caused by Borrelia burgdorferi occur throughout Poland and therefore, according also to ECDC description, the whole country should be considered as an endemic area. OBJECTIVES: The aim of this study was to assess the epidemiological situation of Lyme disease in Poland in 2014 in comparison to the previous years...
2016: Przegla̧d Epidemiologiczny
https://www.readbyqxmd.com/read/27867375/ceftriaxone-pulse-dosing-fails-to-eradicate-biofilm-like-microcolony-b-burgdorferi-persisters-which-are-sterilized-by-daptomycin-doxycycline-cefuroxime-without-pulse-dosing
#9
Jie Feng, Shuo Zhang, Wanliang Shi, Ying Zhang
Although the majority of Lyme disease patients can be cured, at least 10-20% of the patients continue to suffer from persisting symptoms such as fatigue, muscular and joint pain, and neurologic impairment after standard 2-4 week antibiotic treatment. While the causes for this post-treatment Lyme disease symptoms are unclear, one possibility is due to Borrelia burgdorferi persisters that are not effectively killed by current antibiotics such as doxycycline or amoxicillin used to treat Lyme disease. A previous study showed that four rounds of ceftriaxone pulse dosing treatment eradicated B...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27864174/multilocus-sequence-analysis-of-phylogroup-1-and-2-oral-treponeme-strains
#10
Yong-Biao Huo, Yuki Chan, Donnabella C Lacap-Bugler, Sisu Mo, Patrick C Y Woo, W Keung Leung, Rory M Watt
: More than 75 'species-level' phylotypes of spirochete bacteria belonging to the genus Treponema reside within the human oral cavity. The majority of these oral treponeme phylotypes correspond to as-yet uncultivated taxa, or strains of uncertain standing in taxonomy. Here, we analyze phylogenetic and taxonomic relationships between oral treponeme strains using a multilocus sequence analysis (MLSA) scheme based on the highly-conserved 16S rRNA, pyrH, recA and flaA genes. We utilize this MLSA scheme to analyze genetic data from a curated collection of oral treponeme strains (n=71) of diverse geographical origins...
November 18, 2016: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/27864172/the-ebpa-rpon-regulatory-pathway-of-the-pathogen-leptospira-interrogans-is-essential-for-survival-in-the-environment
#11
Wei-Lin Hu, Christopher J Pappas, Jun-Jie Zhang, You-Yun Yang, Jie Yan, Mathieu Picardeau, X Frank Yang
Leptospira interrogans is the agent of leptospirosis, a re-emerging zoonotic disease. Leptospirosis is transmitted to humans through environmental surface waters contaminated by the urine of mammals that are chronically infected by pathogenic strains that are able to survive in water for long periods. Little is known about the regulatory pathways underlying environmental sensing and host adaptation of L. interrogans during its enzootic cycle. This study identifies the EbpA-RpoN regulatory pathway in L. interrogans In this pathway, EbpA, a σ(54) activator and putative prokaryotic enhancer-binding protein (EBP), and the alternative sigma factor RpoN (σ(54)) control expression of at least three genes - encoding AmtB (an ammonium transport protein) and two proteins of unknown function...
November 18, 2016: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/27859692/louse-borne-relapsing-fever-in-finland-in-two-asylum-seekers-from-somalia
#12
Jukka Hytönen, Tamim Khawaja, Juha O Grönroos, Anna Jalava, Seppo Meri, Jarmo Oksi
We report two cases of louse-borne relapsing fever (LBRF) in young Somali asylum seekers having recently arrived to Finland. They had sought medical attention for a febrile illness. Blood smears were examined for suspected malaria, but instead, spirochete shaped bacteria were observed. The bacteria were confirmed as Borrelia recurrentis by PCR and sequencing. The patients survived, but their treatment was complicated by Jarisch-Herxheimer reaction. We conclude that LBRF must be considered as a diagnostic option in febrile refugees also in the northernmost parts of Europe...
November 16, 2016: APMIS: Acta Pathologica, Microbiologica, et Immunologica Scandinavica
https://www.readbyqxmd.com/read/27857714/t-cells-exacerbate-lyme-borreliosis-in-tlr2-deficient-mice
#13
Carrie E Lasky, Carmela L Pratt, Kinsey A Hilliard, John L Jones, Charles R Brown
Infection of humans with the spirochete, Borrelia burgdorferi, causes Lyme borreliosis and can lead to clinical manifestations such as arthritis, carditis, and neurological conditions. Experimental infection of mice recapitulates many of these symptoms and serves as a model system for the investigation of disease pathogenesis and immunity. Innate immunity is known to drive the development of Lyme arthritis and carditis, but the mechanisms driving this response remain unclear. Innate immune cells recognize B...
2016: Frontiers in Immunology
https://www.readbyqxmd.com/read/27852620/cyclic-di-gmp-binding-induces-structural-rearrangements-in-the-plza-and-plzc-proteins-of-the-lyme-disease-and-relapsing-fever-spirochetes-a-possible-switch-mechanism-for-c-di-gmp-mediated-effector-functions
#14
Katherine L Mallory, Daniel P Miller, Lee D Oliver, John C Freedman, Jessica L Kostick-Dunn, Jason A Carlyon, James D Marion, Jessica K Bell, Richard T Marconi
The c-di-GMP network of Borrelia burgdorferi, a causative agent of Lyme disease, consists of Rrp1, a diguanylate cyclase/response regulator; Hpk1, a histidine kinase; PdeA and PdeB, c-di-GMP phosphodiesterases; and PlzA, a PilZ domain c-di-GMP receptor. Borrelia hermsii, a causative agent of tick-borne relapsing fever, possesses a putative c-di-GMP regulatory network that is uncharacterized. While B. burgdorferi requires c-di-GMP to survive within ticks, the associated effector mechanisms are poorly defined...
November 2016: Pathogens and Disease
https://www.readbyqxmd.com/read/27836839/multi-strain-infections-of-the-lyme-borreliosis-pathogen-in-the-tick-vector
#15
Jonas Durand, Coralie Herrmann, Dolores Genné, Anouk Sarr, Lise Gern, Maarten J Voordouw
: Mixed or multiple-strain infections are common in vector-borne diseases and have important implications for the epidemiology of these pathogens. Previous studies have mainly focused on interactions between pathogen strains in the vertebrate host, but little is known about what happens in the arthropod vector. Borrelia afzelii and B. garinii are two species of spirochete bacteria that cause Lyme borreliosis in Europe and that share a common tick vector Ixodes ricinus Each of these two tick-borne pathogens consists of multiple strains that are often differentiated using the highly polymorphic ospC gene...
November 11, 2016: Applied and Environmental Microbiology
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
#16
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/27811049/phage-mediated-horizontal-gene-transfer-of-both-prophage-and-heterologous-dna-by-%C3%AF-bb-1-a-bacteriophage-of-borrelia-burgdorferi
#17
Christian H Eggers, Carlie M Gray, Alexander M Preisig, Danielle M Glenn, Jessica Pereira, Ryan W Ayers, Mohammad Alshahrani, Christopher Acabbo, Maria R Becker, Kimberly N Bruenn, Timothy Cheung, Taylor M Jendras, Aron B Shepley, John T Moeller
Horizontal gene transfer (HGT) in Borrelia burgdorferi, the Lyme disease agent, is likely mediated by bacteriophage. Studies of the B. burgdorferi phage, ϕBB-1, and its role in HGT have been hindered by the lack of an assay for readily characterizing phage-mediated DNA movement (transduction). Here we describe an in vitro assay in which a clone of B. burgdorferi strain CA-11.2A encoding kanamycin resistance on a ϕBB-1 prophage is co-cultured with different clones encoding gentamicin resistance on a shuttle vector; transduction is monitored by enumerating colonies selected in the presence of both kanamycin and gentamicin...
November 2, 2016: Pathogens and Disease
https://www.readbyqxmd.com/read/27806739/validation-of-droplet-digital-pcr-for-the-detection-and-absolute-quantification-of-borrelia-dna-in-ixodes-scapularis-ticks
#18
Jenny L King, Ashley D Smith, Elizabeth A Mitchell, Michael S Allen
We evaluated the QX200 Droplet Digital PCR (ddPCR™, Bio-Rad) system and protocols for the detection of the tick-borne pathogens Borrelia burgdorferi and Borrelia miyamotoi in Ixodes scapularis nymphs and adults collected from North Truro, Massachusetts. Preliminary screening by nested PCR determined positive infection levels of 60% for B. burgdorferi in these ticks. To investigate the utility of ddPCR as a screening tool and to calculate the absolute number of bacterial genome copies in an infected tick, we adapted previously reported TaqMan®-based qPCR assays for ddPCR...
November 3, 2016: Parasitology
https://www.readbyqxmd.com/read/27799336/borrelia-burgdorferi-chey2-is-dispensable-for-chemotaxis-or-motility-but-crucial-for-the-infectious-life-cycle-of-the-spirochete
#19
Hui Xu, Syed Sultan, Aaron Yerke, Ki Hwan Moon, R Mark Wooten, Md A Motaleb
The requirements for bacterial chemotaxis and motility range from dispensable to crucial for host colonization. Even though more than 50% of all sequenced prokaryotic genomes possess at least one chemotaxis signaling system, many of those genomes contain multiple copies of a chemotaxis gene. However, the function of most of those additional genes are unknown. Most motile bacteria possess at least one CheY response regulator that is typically dedicated to the control of motility, and which is usually essential for virulence...
October 31, 2016: Infection and Immunity
https://www.readbyqxmd.com/read/27799330/antibody-response-to-lyme-disease-spirochetes-in-the-context-of-vlse-mediated-immune-evasion
#20
Artem S Rogovskyy, David C Gillis, Yurij Ionov, Ekaterina Gerasimov, Alex Zelikovsky
Lyme disease (LD), the most prevalent tick-borne illness in North America is caused by Borrelia burgdorferi (Bb). The long-term survival of Bb spirochetes in the mammalian host is achieved though VlsE-mediated antigenic variation. It is mathematically predicted that a highly variable surface antigen prolongs bacterial infection sufficiently to exhaust the immune response directed towards invariant surface antigens. If the prediction is correct, it is expected that the antibody response to Bb invariant antigens will become non-protective as Bb infection progresses...
October 31, 2016: Infection and Immunity
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