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https://www.readbyqxmd.com/read/28726608/density-dependent-prevalence-of-francisella-tularensis-in-fluctuating-vole-populations-northwestern-spain
#1
Ruth Rodríguez-Pastor, Raquel Escudero, Dolors Vidal, François Mougeot, Beatriz Arroyo, Xavier Lambin, Ave Maria Vila-Coro, Isabel Rodríguez-Moreno, Pedro Anda, Juan J Luque-Larena
Tularemia in humans in northwestern Spain is associated with increases in vole populations. Prevalence of infection with Francisella tularensis in common voles increased to 33% during a vole population fluctuation. This finding confirms that voles are spillover agents for zoonotic outbreaks. Ecologic interactions associated with tularemia prevention should be considered.
August 2017: Emerging Infectious Diseases
https://www.readbyqxmd.com/read/28725638/isolation-of-f-novicida-containing-phagosome-from-infected-human-monocyte-derived-macrophages
#2
Valentina Marecic, Olga Shevchuk, Mateja Ozanic, Mirna Mihelcic, Michael Steinert, Antonija Jurak Begonja, Yousef Abu Kwaik, Marina Santic
Francisella is a gram-negative bacterial pathogen, which causes tularemia in humans and animals. A crucial step of Francisella infection is its invasion of macrophage cells. Biogenesis of the Francisella-containing phagosome (FCP) is arrested for ~15 min at the endosomal stage, followed by gradual bacterial escape into the cytosol, where the microbe proliferates. The crucial step in pathogenesis of tularemia is short and transient presence of the bacterium within phagosome. Isolation of FCPs for further studies has been challenging due to the short period of time of bacterial residence in it and the characteristics of the FCP...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28722639/human-cases-of-tularemia-in-armenia-1996-2012
#3
Syuzanna Melikjanyan, Karo Palayan, Artavazd Vanyan, Lilit Avetisyan, Nune Bakunts, Marine Kotanyan, Marta Guerra
A retrospective analysis was conducted of human cases and outbreaks of tularemia in the Republic of Armenia from 1996 to 2012 utilizing Geographic Information System software. A total of 266 human cases of tularemia were recorded in Armenia from 1996 to 2012, with yearly incidence ranging from 0 to 5.5 cases per 100,000 people. Cases predominantly affected the male population (62.8%), 11-20 year age group (37.2%), agricultural workers (49.6%), and persons residing in rural areas (93.6%). In 2003, a waterborne outbreak involving 158 cases occurred in Kotayk Marz, and in 2007, a foodborne outbreak with 17 cases occurred in Gegharkunik Marz, attributed to exposure of food products to contaminated hay...
June 19, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28690600/differential-growth-of-francisella-tularensis-which-alters-expression-of-virulence-factors-dominant-antigens-and-surface-carbohydrate-synthases-governs-the-apparent-virulence-of-ft-schus4-to-immunized-animals
#4
Kristen M Holland, Sarah J Rosa, Kolbrun Kristjansdottir, Donald Wolfgeher, Brian J Franz, Tiffany M Zarrella, Sudeep Kumar, Raju Sunagar, Anju Singh, Chandra S Bakshi, Prachi Namjoshi, Eileen M Barry, Timothy J Sellati, Stephen J Kron, Edmund J Gosselin, Douglas S Reed, Karsten R O Hazlett
The gram-negative bacterium Francisella tularensis (Ft) is both a potential biological weapon and a naturally occurring microbe that survives in arthropods, fresh water amoeba, and mammals with distinct phenotypes in various environments. Previously, we used a number of measurements to characterize Ft grown in Brain-Heart Infusion (BHI) broth as (1) more similar to infection-derived bacteria, and (2) slightly more virulent in naïve animals, compared to Ft grown in Mueller Hinton Broth (MHB). In these studies we observed that the free amino acids in MHB repress expression of select Ft virulence factors by an unknown mechanism...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28684041/five-cases-of-vector-borne-francisella-tularensis-holarctica-infections-in-south-western-germany-and-genetic-diversity
#5
Johannes P Borde, Sabine Zange, Markus H Antwerpen, Enrico Georgi, Heiner von Buttlar, Winfried V Kern, Siegbert Rieg
Tularemia is a rare zoonotic disease in Germany. Francisella tularensis has been isolated previously from ticks in southern Germany underscoring the importance of ticks (Ixodes ricinus) in tularemia transmission, but there have been only few reports from this region with single cases or small case series of tick-borne transmissions of tularemia. We report five cases of non-game animal associated tularemia diagnosed from 2010 to 2016 in southwestern Germany - Baden-Wuerttemberg. Our case series and molecular typing (MLVA) results add published clinical experience to this underdiagnosed disease and consolidate previous findings regarding tick-borne transmission of tularemia and phylogenetic diversity in Germany...
August 2017: Ticks and Tick-borne Diseases
https://www.readbyqxmd.com/read/28680859/differential-substrate-usage-and-metabolic-fluxes-in-francisella-tularensis-subspecies-holarctica-and-francisella-novicida
#6
Fan Chen, Kerstin Rydzewski, Erika Kutzner, Ina Häuslein, Eva Schunder, Xinzhe Wang, Kevin Meighen-Berger, Roland Grunow, Wolfgang Eisenreich, Klaus Heuner
Francisella tularensis is an intracellular pathogen for many animals causing the infectious disease, tularemia. Whereas F. tularensis subsp. holarctica is highly pathogenic for humans, F. novicida is almost avirulent for humans, but virulent for mice. In order to compare metabolic fluxes between these strains, we performed (13)C-labeling experiments with F. tularensis subsp. holarctica wild type (beaver isolate), F. tularensis subsp. holarctica strain LVS, or F. novicida strain U112 in complex media containing either [U-(13)C6]glucose, [1,2-(13)C2]glucose, [U-(13)C3]serine, or [U-(13)C3]glycerol...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28652232/characterization-of-a-francisella-tularensis-caenorhabditis-elegans-pathosystem-for-the-evaluation-of-therapeutic-compounds
#7
Elamparithi Jayamani, Nagendran Tharmalingam, Rajmohan Rajamuthiah, Jeffrey J Coleman, Wooseong Kim, Ikechukwu Okoli, Ana M Hernandez, Kiho Lee, Gerard J Nau, Frederick M Ausubel, Eleftherios Mylonakis
Francisella tularensis is a highly infectious Gram-negative intracellular pathogen that causes tularemia. Because of its potential as a bioterrorism agent, there is a need for new therapeutic agents. We therefore developed a whole animal Caenorhabditis elegans-F. tularensis pathosystem for high throughput screening to identify and characterize potential therapeutic compounds. We found that the C. elegans p38 MAP kinase cascade is involved in the immune response to F. tularensis and we developed a robust F. tularensis-mediated C...
June 26, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28649303/introduction-and-persistence-of-tularemia-in-bulgaria
#8
Mohammad Khan
No abstract text is available yet for this article.
2017: Infection Ecology & Epidemiology
https://www.readbyqxmd.com/read/28630061/increased-resistance-to-intradermal-francisella-tularensis-lvs-infection-by-inactivation-of-the-sts-phosphatases
#9
Kaustubh Parashar, Erik Kopping, David Frank, Vinaya Sampath, David G Thanassi, Nick Carpino
The Suppressor of TCR signaling proteins (Sts-1 and Sts-2) are two homologous phosphatases that negatively regulate signaling pathways in a number of hematopoietic lineages, including T lymphocytes. Mice lacking Sts expression are characterized by enhanced T cell responses. Additionally, a recent study demonstrated that Sts-/- mice are profoundly resistant to systemic infection of Candida albicans, with resistance characterized by enhanced survival, more rapid fungal clearance in key peripheral organs, and an altered inflammatory response...
June 19, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28626537/epidemiological-distribution-of-rodents-as-potent-reservoirs-for-infectious-diseases-in-the-provinces-of-mazandaran-gilan-and-golestan-northern-iran
#10
Behzad Esfandiari, Hossein Nahrevanian, Mohammad Reza Pourshafie, Mohammad Mehdi Gouya, Pejvak Khaki, Ehsan Mostafavi, Jamshid Darvish, Hamed Hanifi
Rodents are mammals that comprise more than 2000 species and approximately 30 families. There are many morphological and ecological differences among them as variations in their shape, size, weight and habitat. In addition to significant economic losses, rodents have a major role in the dissemination of infectious diseases caused by viruses, bacteria, parasites or other micro-organisms. Rodents are important reservoirs of diseases which have been observed in many cities of Iran provinces especially along Caspian Sea border to Alborz Mountain...
May 31, 2017: Infectious Disease Reports
https://www.readbyqxmd.com/read/28611741/glycosylation-of-a-capsule-like-complex-clc-by-francisella-novicida-is-required-for-virulence-and-partial-protective-immunity-in-mice
#11
Kelly C Freudenberger Catanzaro, Anna E Champion, Nrusingh Mohapatra, Thomas Cecere, Thomas J Inzana
Francisella tularensis is a Gram-negative bacterium and the etiologic agent of tularemia. F. tularensis may appear encapsulated when examined by transmission electron microscopy (TEM), which is due to production of an extracellular capsule-like complex (CLC) when the bacterium is grown under specific environmental conditions. Deletion of two glycosylation genes in the live vaccine strain (LVS) results in loss of apparent CLC and attenuation of LVS in mice. In contrast, F. novicida, which is also highly virulent for mice, is reported to be non-encapsulated...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28580063/imaging-findings-of-ulceroglandular-tularemia
#12
Neil Anand, Osmani Deochand, Robyn Murphy
Francisella tularensis, the causative organism in Tularemia, is a relatively rare disease. There are a few radiological clues to elucidate its presence when suspicion arises. There should be strong consideration for Tularemia in the differential of any patient with its classic symptoms, diffuse cervical lymphadenopathy with evidence of necrosis, and enlarged adenoids. Ultrasound may demonstrate suppurative lymphadenopathy suggestive of infection, as in the case presented. CT often will demonstrate the extent of lymphadenopathy...
January 2017: Journal of Radiology Case Reports
https://www.readbyqxmd.com/read/28559261/the-fluorocycline-tp-271-is-efficacious-in-models-of-aerosolized-francisella-tularensis-schu-s4-infection-in-balb-c-mice-and-cynomolgus-macaques
#13
Trudy H Grossman, Michael S Anderson, David Christ, Melanie Gooldy, Lisa N Henning, Henry S Heine, M Victoria Kindt, Winston Lin, Kaylyn Siefkas-Patterson, Anne K Radcliff, Vincent H Tam, Joyce A Sutcliffe
TP-271 is a novel, fully synthetic fluorocycline in development for complicated bacterial respiratory infections. TP-271 was active in vitro against a panel of 29 Francisella tularensis isolates, showing minimal inhibitory concentrations against 50% and 90% of isolates of 0.25 and 0.5μg/mL, respectively. In a mouse model of inhalational tularemia, animals were exposed by aerosol to 91 to 283 LD50/mouse of F. tularensis SCHU S4. Following 21 days of once-daily intraperitoneal dosing of 3, 6, 12 and 18 mg/kg/day TP-271, initiating at 24 hours post-challenge, survival was 80%, 100%, 100%, and 100%, respectively...
May 30, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28511911/sulfonamide-inhibition-profiles-of-the-%C3%AE-carbonic-anhydrase-from-the-pathogenic-bacterium-francisella-tularensis-responsible-of-the-febrile-illness-tularemia
#14
Sonia Del Prete, Daniela Vullo, Sameh M Osman, Zeid AlOthman, Claudiu T Supuran, Clemente Capasso
A new β-class carbonic anhydrase (CA, EC 4.2.1.1) has been cloned, purified and characterized in the genome of the pathogenic bacterium Francisella tularensis responsible of the febrile illness tularemia. This enzyme, FtuβCA, showed a kcat of 9.8 ×10(5)s(-1) and a kcat/KM of 8.9 ×10(7)M(-1)s(-1) for the CO2 hydration, physiological reaction, being one of the most effective β-CAs known to date, with a catalytic activity only 1.68-times lower than that of the human(h) isoform hCA II. A panel of 39 simple aromatic and heterocyclic sulfonamides, as well as clinically used drugs incorporating sulfonamide/sulfamate zinc-binding groups, was used to investigate the inhibition profile of FtuβCA with these classes of derivatives...
July 1, 2017: Bioorganic & Medicinal Chemistry
https://www.readbyqxmd.com/read/28503372/endosymbiont-interference-and-microbial-diversity-of-the-pacific-coast-tick-dermacentor-occidentalis-in-san-diego-county-california
#15
Nikos Gurfield, Saran Grewal, Lynnie S Cua, Pedro J Torres, Scott T Kelley
The Pacific coast tick, Dermacentor occidentalis Marx, is found throughout California and can harbor agents that cause human diseases such as anaplasmosis, ehrlichiosis, tularemia, Rocky Mountain spotted fever and rickettsiosis 364D. Previous studies have demonstrated that nonpathogenic endosymbiotic bacteria can interfere with Rickettsia co-infections in other tick species. We hypothesized that within D. occidentalis ticks, interference may exist between different nonpathogenic endosymbiotic or nonendosymbiotic bacteria and Spotted Fever group Rickettsia (SFGR)...
2017: PeerJ
https://www.readbyqxmd.com/read/28486521/the-potential-for-flower-nectar-to-allow-mosquito-to-mosquito-transmission-of-francisella-tularensis
#16
Adam Kenney, Austin Cusick, Jessica Payne, Anna Gaughenbaugh, Andrea Renshaw, Jenna Wright, Roger Seeber, Rebecca Barnes, Aleksandr Florjanczyk, Joseph Horzempa
Francisella tularensis is disseminated in nature by biting arthropods such as mosquitoes. The relationship between mosquitoes and F. tularensis in nature is highly ambiguous, due in part to the fact that mosquitoes have caused significant tularemia outbreaks despite being classified as a mechanical vector of F. tularensis. One possible explanation for mosquitoes being a prominent, yet mechanical vector is that these insects feed on flower nectar between blood meals, allowing for transmission of F. tularensis between mosquitoes...
2017: PloS One
https://www.readbyqxmd.com/read/28480295/variation-in-tularemia-clinical-manifestations-arkansas-2009-2013
#17
Laura K Lester Rothfeldt, Richard F Jacobs, J Gary Wheeler, Susan Weinstein, Dirk T Haselow
BACKGROUND: Francisella tularensis, although naturally occurring in Arkansas, is also a Tier 1 select agent and potential bioterrorism threat. As such, tularemia is nationally notifiable and mandatorily reported to the Arkansas Department of Health. We examined demographic and clinical characteristics among reported cases and outcomes to improve understanding of the epidemiology of tularemia in Arkansas. METHODS: Surveillance records on all tularemia cases investigated during 2009-2013 were reviewed...
2017: Open Forum Infectious Diseases
https://www.readbyqxmd.com/read/28452732/-epizootological-and-epidemiological-characteristics-of-tularemia-in-georgia
#18
E Elashvili, I Velijanashvili
The appropriate data as well as archival materials about the spread of Tularemia disease have been studied over of period from 1991-2014 in Georgia in order to evaluate the current situation in Kartli lowland foci as well as the main reasons of disease agent circulation and maintenance in the study area. 54 (24.6%) out of 220 suspicious cases were laboratory confirmed during the study period. Most of confirmed cases - 32 (59.26%) have been detected in Shida Kartli focus among the old population during the outbreaks in the winter period...
February 2017: Georgian Medical News
https://www.readbyqxmd.com/read/28450199/severe-glandular-tularemia-in-a-patient-treated-with-anti-tumour-necrosis-factor-for-psoriatic-arthritis
#19
Ruxandra Calin, Eric Caumes, Florence Reibel, Anzime Ali Mohamed, Florence Brossier, Violaine Foltz, Samia Boussouar, Bruno Fautrel, Max Maurin, Christine Katlama, Valérie Pourcher
A case of severe glandular tularemia in a patient receiving anti-tumour necrosis factor (TNF) therapy is reported here. The patient required prolonged treatment with doxycycline-ciprofloxacin due to early relapse after ciprofloxacin was stopped. Tularemia may have a more severe course in patients receiving anti-TNF. This may thus be an indication for more aggressive treatment.
July 2017: International Journal of Infectious Diseases: IJID
https://www.readbyqxmd.com/read/28421167/iron-and-virulence-in-francisella-tularensis
#20
REVIEW
Girija Ramakrishnan
Francisella tularensis, the causative agent of tularemia, is a Gram-negative bacterium that infects a variety of cell types including macrophages, and propagates with great efficiency in the cytoplasm. Iron, essential for key enzymatic and redox reactions, is among the nutrients required to support this pathogenic lifestyle and the bacterium relies on specialized mechanisms to acquire iron within the host environment. Two distinct pathways for iron acquisition are encoded by the F. tularensis genome- a siderophore-dependent ferric iron uptake system and a ferrous iron transport system...
2017: Frontiers in Cellular and Infection Microbiology
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