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https://www.readbyqxmd.com/read/28545568/symbiont-dynamics-of-the-tibetan-tick-haemaphysalis-tibetensis-acari-ixodidae
#1
Rongrong Wang, Ningxin Li, Jiannan Liu, Tuo Li, Ming Liu, Zhijun Yu, Jingze Liu
BACKGROUND: Characterization of the microbial diversity and symbiont dynamics of ticks may help to understand the development of ticks and reveal new strategies to control tick-transmitted pathogens, which has not yet been explored in the Tibetan tick Haemaphysalis tibetensis. This tick species is widely distributed in the Tibetan Plateau, and is recognized as one of the primary parasites affecting domestic and wild animals. METHODS: In the present study, the endosymbionts of H...
May 25, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28540258/horizontally-acquired-biosynthesis-genes-boost-coxiella-burnetii-s-physiology
#2
Abraham S Moses, Jess A Millar, Matteo Bonazzi, Paul A Beare, Rahul Raghavan
Coxiella burnetii, the etiologic agent of acute Q fever and chronic endocarditis, has a unique biphasic life cycle, which includes a metabolically active intracellular form that occupies a large lysosome-derived acidic vacuole. C. burnetii is the only bacterium known to thrive within such an hostile intracellular niche, and this ability is fundamental to its pathogenicity; however, very little is known about genes that facilitate Coxiella's intracellular growth. Recent studies indicate that C. burnetii evolved from a tick-associated ancestor and that the metabolic capabilities of C...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28539197/candidatus-neoehrlichia-mikurensis-and-borrelia-burgdorferi-sensu-lato-detected-in-the-blood-of-norwegian-patients-with-erythema-migrans
#3
H Quarsten, A Grankvist, L Høyvoll, I B Myre, T Skarpaas, V Kjelland, C Wenneras, S Noraas
The most common tick-borne human disease in Norway is Lyme borreliosis. Ticks in Norway also harbour less known disease-causing agents such as Candidatus Neoehrlichia mikurensis, Borrelia miyamotoi and Rickettsia helvetica. However, human infections caused by these pathogens have never been described in Norway. The main aims of the study were to evaluate the contribution of several tick-borne bacterial agents, other than Borrelia burgdorferi sensu lato, to zoonotic diseases in Norway and to determine their clinical pictures...
May 13, 2017: Ticks and Tick-borne Diseases
https://www.readbyqxmd.com/read/28529959/getting-inside-type-i-ifns-type-i-ifns-in-intracellular-bacterial-infections
#4
REVIEW
Deann T Snyder, Jodi F Hedges, Mark A Jutila
Type I interferons represent a unique and complex group of cytokines, serving many purposes during innate and adaptive immunity. Discovered in the context of viral infections, type I IFNs are now known to have myriad effects in infectious and autoimmune disease settings. Type I IFN signaling during bacterial infections is dependent on many factors including whether the infecting bacterium is intracellular or extracellular, as different signaling pathways are activated. As such, the repercussions of type I IFN induction can positively or negatively impact the disease outcome...
2017: Journal of Immunology Research
https://www.readbyqxmd.com/read/28529926/manipulation-of-host-cholesterol-by-obligate-intracellular-bacteria
#5
REVIEW
Dhritiman Samanta, Minal Mulye, Tatiana M Clemente, Anna V Justis, Stacey D Gilk
Cholesterol is a multifunctional lipid that plays important metabolic and structural roles in the eukaryotic cell. Despite having diverse lifestyles, the obligate intracellular bacterial pathogens Chlamydia, Coxiella, Anaplasma, Ehrlichia, and Rickettsia all target cholesterol during host cell colonization as a potential source of membrane, as well as a means to manipulate host cell signaling and trafficking. To promote host cell entry, these pathogens utilize cholesterol-rich microdomains known as lipid rafts, which serve as organizational and functional platforms for host signaling pathways involved in phagocytosis...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28502643/are-brucellosis-q-fever-and-melioidosis-potential-causes-of-febrile-illness-in-madagascar
#6
Ides Boone, Klaus Henning, Angela Hilbert, Heinrich Neubauer, Vera von Kalckreuth, Denise Myriam Dekker, Norbert Georg Schwarz, Gi Deok Pak, Andreas Krüger, Ralf Matthias Hagen, Hagen Frickmann, Jean Noël Heriniaina, Raphael Rakotozandrindrainy, Jean Philibert Rakotondrainiarivelo, Tsiry Razafindrabe, Benedikt Hogan, Jürgen May, Florian Marks, Sven Poppert, Sascha Al Dahouk
Brucellosis, Q fever and melioidosis are zoonoses, which can lead to pyrexia. These diseases are often under-ascertained and underreported because of their unspecific clinical signs and symptoms, insufficient awareness by physicians and public health officers and limited diagnostic capabilities, especially in low-resource countries. Therefore, the presence of Brucella spp., Coxiella burnetii and Burkholderia pseudomallei was investigated in Malagasy patients exhibiting febrile illness. In addition, we analyzed zebu cattle and their ticks as potential reservoirs for Brucella and C...
May 11, 2017: Acta Tropica
https://www.readbyqxmd.com/read/28502642/molecular-detection-of-tick-borne-pathogens-in-wild-red-foxes-vulpes-vulpes-from-central-italy
#7
Valentina Virginia Ebani, Guido Rocchigiani, Simona Nardoni, Fabrizio Bertelloni, Violetta Vasta, Roberto Amerigo Papini, Ranieri Verin, Alessandro Poli, Francesca Mancianti
Spleen samples from 153 red foxes, shot during regular hunting season in the province of Pisa (Central Italy), were examined to detect DNA of Anaplasma phagocytophilum, Ehrlichia canis, Coxiella burnetii, Francisella tularensis, Hepatozoon canis and Babesia sp./Theileria sp. DNA of vector-borne pathogens was detected in 120 (78.43%; 95% CI: 71.06-84.66%) foxes. Specifically, 75 (49%; 95% CI: 40.86-57.22%) animals scored PCR-positive per H. canis, 68 (44.44%; 95% CI: 36.42-52.69%) for E. canis, 35 (22.88%; 95% CI: 16...
May 11, 2017: Acta Tropica
https://www.readbyqxmd.com/read/28493973/prevalence-of-coxiella-burnetii-in-cattle-at-south-korean-national-breeding-stock-farms
#8
Min-Goo Seo, In-Ohk Ouh, Seung-Hun Lee, Jong Wan Kim, Man Hee Rhee, Oh-Deog Kwon, Tae-Hwan Kim, Dongmi Kwak
This is the first study to evaluate the serologic and molecular prevalence of Coxiella burnetii in cattle at national breeding stock farms in South Korea. These government farms have well-organized biosecurity and management systems to prevent livestock diseases. Of the 736 cattle in this study, 77 tested positive for antibodies against C. burnetii antigens (10.5%, 95% CI: 8.3-12.7) and 11 were positive for a C. burnetti infection on PCR analysis (1.5%, 95% CI: 0.6-2.4). Since the 16S rRNA sequences of C. burnetii from all 11 PCR-positive samples were identical, three representative samples (C-CN-3 from the southern region, C-JJ-9 from Jeju Island, and C-CB-37 from the central region) are described in this paper...
2017: PloS One
https://www.readbyqxmd.com/read/28484683/alterations-of-the-coxiella-burnetii-replicative-vacuole-membrane-integrity-and-interplay-with-the-autophagy-pathway
#9
María E Mansilla Pareja, Antonino Bongiovanni, Frank Lafont, María I Colombo
Coxiella burnetii, the etiologic agent of Q fever, is a Gram-negative obligate intracellular bacterium. It has been previously described that both the endocytic and autophagic pathways contribute to the Coxiella replicative vacuole (CRV) generation. Galectins are β-galactoside-binding lectins that accumulate in the cytosol before being secreted via a non-conventional secretory pathway. It has been shown that Galectin-3, -8, -9 monitor bacteria vacuolar rupture and endosomal and lysosomal loss of membrane integrity through binding of host glycans exposed in the cytoplasm after membrane damage...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28483409/the-presence-of-rhipicephalus-muhsamae-north-of-the-sahara
#10
Johanna Langguth, Lidia Chitimia-Dobler, Santiago Nava, Martin Pfeffer
The occurrence of male and female Rhipicephalus muhsamae feeding on dogs and a horse in Upper Egypt is described. The morphological identification was verified using partial 16S rRNA gene sequences. By applying respective real-time PCRs, no evidence neither for Coxiella burnetii nor for spotted-fever rickettsia infections were found in the ticks.
April 7, 2017: Ticks and Tick-borne Diseases
https://www.readbyqxmd.com/read/28480664/clinical-and-genetic-features-of-coxiella-burnetii-in-a-patient-with-an-acute-febrile-illness-in-korea
#11
Seung Hun Lee, Jung Yeon Heo, Hae Kyung Lee, Yeong Seon Lee, Hye Won Jeong, Seon Do Hwang
Although Q fever is an important zoonotic infection with a worldwide distribution, no human isolates of Coxiella burnetii have been identified in Korea. For the first time, we identified the nucleotide sequence of C. burnetii from a 32-year-old man with an acute febrile illness in Korea. Diagnosis of acute Q fever was confirmed by seroconversion using indirect immunofluorescence antibody assays. Phylogenetic analysis demonstrated high sequence similarity (99.6%-100%) with C. burnetii 16S rRNA sequences identified from the reservoir...
June 2017: Journal of Korean Medical Science
https://www.readbyqxmd.com/read/28463720/an-evaluation-of-risk-factors-for-infection-with-coxiella-burnetii-in-domestic-goats
#12
Amy E Bauer, April J Johnson, Hsin-Yi Weng, Roman M Pogranichniy, George E Moore
No abstract text is available yet for this article.
April 22, 2017: Research in Veterinary Science
https://www.readbyqxmd.com/read/28462725/coxiella-burnetii-q-fever-infection-in-dairy-cattle-and-associated-risk-factors-in-latvia
#13
A Boroduske, J Trofimova, J Kibilds, U Papule, M Sergejeva, I Rodze, L Grantina-Ievina
The purpose of this study was to describe prevalence and spatial distribution of Coxiella burnetii infections in dairy cow sheds in Latvia and to investigate risk factors contributing to C. burnetii infections. Blood serum samples from abortion cases from 1010 sheds have been tested by ELISA for the presence of C. burnetii antibodies and bulk tank milk (BTM) samples from 252 sheds have been tested by real time polymerase chain reaction and ELISA for the presence of C. burnetii DNA and antibodies. Prevalence of C...
May 2, 2017: Epidemiology and Infection
https://www.readbyqxmd.com/read/28455331/reverse-line-blot-based-detection-approaches-of-microbial-pathogens-in-ixodes-ricinus-ticks-collected-in-austria-and-impact-of-the-chosen-method
#14
Anna-Margarita Schötta, Michiel Wijnveld, Hannes Stockinger, Gerold Stanek
Ticks transmit a large number of pathogens capable of causing human disease. In this study, the PCR-reverse line blot (RLB) method was used to screen for pathogens in a total of 554 Ixodes ricinus ticks collected from all provinces of Austria. These pathogens belong to the genera Borrelia, Rickettsiae, Anaplasma/(Neo-)Ehrlichia, Babesia, and CoxiellaThe pathogens with the highest detected prevalence were spirochetes of the Borrelia burgdorferi sensu lato complex, in 142 ticks (25.6%). B. afzelii (80/142) was the most frequently detected species, followed by B...
April 28, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28455328/coxiella-burnetii-circulation-in-a-naturally-infected-flock-of-sheep-individual-follow-up-of-antibodies-in-serum-and-milk
#15
A Joulié, E Rousset, P Gasqui, E Lepetitcolin, A Leblond, K Sidi-Boumedine, E Jourdain
The control of Q fever, a zoonotic disease caused by the Coxiella burnetii bacterium, remains a scientific challenge. Domestic ruminants are considered the main reservoir, shedding C. burnetii essentially through parturition products during abortion or birth. Sheep are particularly frequently associated with human outbreaks, but there are insufficient field data to fully understand disease dynamics and instigate efficient control measures.A longitudinal follow-up study of a naturally infected sheep flock was performed in order to: (a) investigate relationships between seropositivity and bacterial shedding in the vaginal mucus, (b) describe the kinetics of antibodies, including responses to vaccination, (c) monitor maternal antibodies in ewe lambs, and (d) compare serological results in milk and serum samples...
April 28, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28449081/the-coxiella-burnetii-type-ivb-secretion-system-t4bss-component-dota-is-released-secreted-during-infection-of-host-cells-and-during-in-vitro-growth-in-a-t4bss-dependent-manner
#16
Brandon E Luedtke, Saugata Mahapatra, Erika I Lutter, Edward I Shaw
Coxiella burnetii is a Gram-negative intracellular pathogen and is the causative agent of the zoonotic disease Q fever. To cause disease, C. burnetii requires a functional type IVB secretion system (T4BSS) to transfer effector proteins required for the establishment and maintenance of a membrane-bound parasitophorous vacuole (PV) and further modulation of host cell process. However, it is not clear how the T4BSS interacts with the PV membrane since neither a secretion pilus nor an extracellular pore forming apparatus has not been described...
June 1, 2017: Pathogens and Disease
https://www.readbyqxmd.com/read/28438980/host-and-bacterial-factors-control-susceptibility-of-drosophila-melanogaster-to-coxiella-burnetii-infection
#17
Reginaldo G Bastos, Zachary P Howard, Aoi Hiroyasu, Alan G Goodman
Coxiella burnetii is the causative agent of Q fever, a zoonotic disease that threatens both human and animal health. Due to the paucity of experimental animal models, little is known about how host factors interface with bacterial components and affect pathogenesis. Here we used Drosophila melanogaster, in conjunction with the BSL2 Nine Mile phase II (NMII) clone 4 strain of C. burnetii, as a model to investigate host and bacterial components implicated in infection. We demonstrated that adult Drosophila are susceptible to C...
April 24, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28434420/environmental-sampling-coupled-with-real-time-pcr-and-genotyping-to-investigate-the-source-of-a-q-fever-outbreak-in-a-work-setting
#18
A Hurtado, E Alonso, I Aspiritxaga, I López Etxaniz, B Ocabo, J F Barandika, J I Fernández-Ortiz DE Murúa, F Urbaneja, R Álvarez-Alonso, I Jado, A L García-Pérez
A Q fever outbreak was declared in February 2016 in a company that manufactures hoists and chains and therefore with no apparent occupational-associated risk. Coxiella burnetii infection was diagnosed by serology in eight of the 29 workers of the company; seven of them had fever or flu-like signs and five had pneumonia, one requiring hospitalisation. A further case of C. burnetii pneumonia was diagnosed in a local resident. Real-time PCR (RTi-PCR) showed a widespread distribution of C. burnetii DNA in dust samples collected from the plant facilities, thus confirming the exposure of workers to the infection inside the factory...
April 24, 2017: Epidemiology and Infection
https://www.readbyqxmd.com/read/28418317/no-such-thing-as-chronic-q-fever
#19
Matthieu Million, Didier Raoult
Modern diagnostic methods enable clinicians to look beyond a diagnosis of chronic Q fever and discern whether patients instead have persistent focalized Coxiella burnetii infection(s). Use of these methods and development of criteria to define and treat such infections, especially cardiovascular infections, will improve the prognosis for patients previously thought to have chronic Q fever.
May 2017: Emerging Infectious Diseases
https://www.readbyqxmd.com/read/28403908/permissiveness-of-bovine-epithelial-cells-from-lung-intestine-placenta-and-udder-for-infection-with-coxiella-burnetii
#20
Katharina Sobotta, Katharina Bonkowski, Elisabeth Liebler-Tenorio, Pierre Germon, Pascal Rainard, Nina Hambruch, Christiane Pfarrer, Ilse D Jacobsen, Christian Menge
Ruminants are the main source of human infections with the obligate intracellular bacterium Coxiella (C.) burnetii. Infected animals shed high numbers of C. burnetii by milk, feces, and birth products. In goats, shedding by the latter route coincides with C. burnetii replication in epithelial (trophoblast) cells of the placenta, which led us to hypothesize that epithelial cells are generally implicated in replication and shedding of C. burnetii. We therefore aimed at analyzing the interactions of C. burnetii with epithelial cells of the bovine host (1) at the entry site (lung epithelium) which govern host immune responses and (2) in epithelial cells of gut, udder and placenta decisive for the quantity of pathogen excretion...
April 12, 2017: Veterinary Research
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