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https://www.readbyqxmd.com/read/29164069/iron-acquisition-mechanisms-and-their-role-in-the-virulence-of-burkholderia-species
#1
REVIEW
Aaron T Butt, Mark S Thomas
Burkholderia is a genus within the β-Proteobacteriaceae that contains at least 90 validly named species which can be found in a diverse range of environments. A number of pathogenic species occur within the genus. These include Burkholderia cenocepacia and Burkholderia multivorans, opportunistic pathogens that can infect the lungs of patients with cystic fibrosis, and are members of the Burkholderia cepacia complex (Bcc). Burkholderia pseudomallei is also an opportunistic pathogen, but in contrast to Bcc species it causes the tropical human disease melioidosis, while its close relative Burkholderia mallei is the causative agent of glanders in horses...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/29141724/prostatic-abscess-due-to-burkholderia-pseudomallei-facilitating-diagnosis-to-optimize-management
#2
Jowita Kozlowska, Simon Smith, Jay Roberts, Simon Pridgeon, Josh Hanson
Prostatic involvement is common in men with melioidosis. Indeed, some clinicians recommend radiological screening of all male patients as an undrained prostatic abscess may result in relapse of this potentially fatal disease. However, sophisticated medical imaging is frequently unavailable in the remote and resource-poor locations where patients are managed. In this retrospective study from Queensland, Australia, 22/144 (15%) men with melioidosis had a radiologically confirmed prostatic abscess. The absence of urinary symptoms had a negative predictive value (NPV) (95% confidence interval [CI]) for prostatic abscess of 96% (90-99%), whereas a urinary leukocyte count of < 50 × 10(6)/L had an NPV (95% CI) of 100% (94-100%)...
October 30, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/29136176/mutations-in-metg-methionyl-trna-synthetase-and-trmd-trna-guanine-n1-methyltransferase-conferring-meropenem-tolerance-in-burkholderia-thailandensis
#3
Hyojeong Yi, Hyeri Lee, Kwang-Hwi Cho, Heenam Stanley Kim
Objectives: Although meropenem is widely used to treat Burkholderia infections, the response of Burkholderia pathogens to this antibiotic is largely unexplored. Methods: Burkholderia thailandensis, a model for Burkholderia spp., particularly Burkholderia mallei and Burkholderia pseudomallei, was challenged with a lethal level of meropenem and survivors were isolated. The genomes of two of the isolates were analysed to identify mutated genes and these genes were then specifically examined in more isolates to profile mutation diversity...
November 9, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29111189/clinical-and-environmental-isolates-of-burkholderia-pseudomallei-from-brazil-genotyping-and-detection-of-virulence-gene
#4
Tereza de Jesus Pinheiro Gomes Bandeira, Débora de Souza Collares Maia Castelo-Branco, Marcos Fábio Gadelha Rocha, Rossana de Aguiar Cordeiro, Crister José Ocadaque, Manoel de Araújo Neto Paiva, Raimunda Sâmia Nogueira Brilhante, José Júlio Costa Sidrim
OBJECTIVE: To evaluate the genetic diversity of clinical and environmental isolates of Burkholderia pseudomallei (B. pseudomallei) recovered in Ceará, Brazil, and screen these isolates for the presence of type three secretion system virulence gene. METHODS: Nineteen B. pseudomallei isolates (9 from clinical cases and 10 from soils) were analyzed. Random amplified polymorphic DNA was performed with primers OPQ-2, OPQ-4 and OPQ-16 to evaluate the genetic diversity, and type three secretion system gene was detected through polymerase chain reaction...
October 2017: Asian Pacific Journal of Tropical Medicine
https://www.readbyqxmd.com/read/29109172/development-of-subunit-vaccines-that-provide-high-level-protection-and-sterilizing-immunity-against-acute-inhalational-melioidosis
#5
Mary N Burtnick, Teresa L Shaffer, Brittany N Ross, Laura A Muruato, Elena Sbrana, David DeShazer, Alfredo G Torres, Paul J Brett
Burkholderia pseudomallei, the etiologic agent of melioidosis, causes severe disease in humans and animals. Diagnosis and treatment of melioidosis can be challenging and no licensed vaccines currently exist. Several studies have shown that this pathogen expresses a variety of structurally conserved protective antigens that include cell-surface polysaccharides and cell-associated/-secreted proteins. Based on this, such antigens have become important components of the subunit vaccine candidates that we are currently developing...
November 6, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/29108209/-analysis-the-clinical-features-of-pseudomonas-pseudomallei-liver-abscesses
#6
Y H Wu, Y F Zhan, A L Yu, Q Li
No abstract text is available yet for this article.
October 20, 2017: Zhonghua Gan Zang Bing za Zhi, Zhonghua Ganzangbing Zazhi, Chinese Journal of Hepatology
https://www.readbyqxmd.com/read/29099689/identification-of-novel-small-rnas-in-burkholderia-cenocepacia-kc-01-expressed-under-iron-limitation-and-oxidative-stress-conditions
#7
Suparna Ghosh, Chetna Dureja, Indu Khatri, Srikrishna Subramanian, Saumya Raychaudhuri, Sagarmoy Ghosh
Small RNA (sRNA)-mediated regulation of gene expression is a major tool to understand bacterial responses to environmental changes. In particular, pathogenic bacteria employ sRNAs to adapt to the host environment and establish infection. Members of the Burkholderia cepacia complex, normally present in soil microbiota, cause nosocomial lung infection especially in hospitalized cystic fibrosis patients. We sequenced the draft genome of Burkholderia cenocepacia KC-01, isolated from the coastal saline soil, and identified several potential sRNAs in silico...
November 3, 2017: Microbiology
https://www.readbyqxmd.com/read/29098887/comparison-of-the-amine-amino-acid-activation-profiles-of-the-%C3%AE-and-%C3%AE-carbonic-anhydrases-from-the-pathogenic-bacterium-burkholderia-pseudomallei
#8
COMPARATIVE STUDY
Daniela Vullo, Sonia Del Prete, Sameh M Osman, Fatmah A S Alasmary, Zeid AlOthman, William A Donald, Clemente Capasso, Claudiu T Supuran
The β-class carbonic anhydrase (CA, EC 4.2.1.1) from the pathogenic bacterium Burkholderia pseudomallei, BpsCAβ, that is responsible for the tropical disease melioidosis was investigated for its activation with natural and non-natural amino acids and amines. Previously, the γ-CA from this bacterium has been investigated with the same library of 19 amines/amino acids, which show very potent activating effects on both enzymes. The most effective BpsCAβ activators were L- and D-DOPA, L- and D-Trp, L-Tyr, 4-amino-L-Phe, histamine, dopamine, serotonin, 2-pyridyl-methylamine, 1-(2-aminoethyl)-piperazine and L-adrenaline with KAs of 0...
December 2018: Journal of Enzyme Inhibition and Medicinal Chemistry
https://www.readbyqxmd.com/read/29074366/production-and-evaluation-of-recombinant-burkholderia-pseudomallei-groel-and-ompa-proteins-for-serodiagnosis-of-melioidosis
#9
Kanyanan Kritsiriwuthinan, Sumet Wajanarogana, Kantima Choosang, Jetsada Homsian, Sukritta Rerkthanom
Melioidosis is a bacterial infectious disease caused by Burkholderia pseudomallei (B. pseudomallei). The variable clinical manifestations of this disease make its diagnosis difficult. The gold standard strategy for diagnosis is bacterial culture and identification, which is time-consuming and often too late for early medical intervention. Therefore, a rapid and accurate diagnosis of melioidosis is needed for effective treatment. This study aimed to produce and evaluate two purified B. pseudomallei recombinant proteins (rGroEL and rOmpA) as potential antigens for melioidosis diagnosis by ELISA...
October 23, 2017: Acta Tropica
https://www.readbyqxmd.com/read/29054959/honeycomb-and-necklace-signs-in-liver-abscesses-secondary-to-melioidosis
#10
Sidney Ching Liang Ong, Mina Mustafa Mahmood Alemam, Nor Aniza Zakaria, Nur Azidawati Abdul Halim
Melioidosis is endemic in Southeast Asia and tropical Australia with varying clinical features from benign skin lesions to fatal septicaemia. Imaging plays an important role in evaluation of the melioid liver abscesses. A 45-year-old man with underlying diabetes presented with fever and lethargy for 2 weeks and abdominal pain for 2 days. His liver was enlarged on examination. Blood investigations revealed mild leucocytosis and raised liver enzymes. Ultrasound showed multiple multiloculated hypoechoic lesions throughout the liver and spleen...
October 19, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/29048275/comparison-of-in-house-igm-and-igg-elisas-for-the-serodiagnosis-of-melioidosis-in-malaysia
#11
Shirley Yi Fen Hii, Noor Azila Ali, Norazah Ahmad, Fairuz Amran
Melioidosis is an endemic infectious disease in Southeast Asia and northern Australia, caused by Burkholderia pseudomallei. However, the incidence rate in Malaysia is not well documented. The high mortality rate and broad range of clinical presentations require rapid and accurate diagnosis for appropriate treatment. This study compared the efficacy of in-house IgM and IgG ELISA methods using a local B. pseudomallei strain. The diagnostic accuracy of the in-house IgG ELISA was better than that of the IgM ELISA: sensitivity (IgG: 84...
October 19, 2017: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/29046753/melioidosis-the-great-mimicker
#12
Mandeep Singh, Mehvish Mahmood
Melioidosis is an infectious disease endemic in Northern Australia and South East Asia. It is associated with high degrees of morbidity and mortality. On average, around five cases are diagnosed annually in the USA. Diagnosis remains a challenge, as it mimics many other conditions, especially tuberculosis, hence its other name, the 'great mimicker.' The present case involves a recent traveler to the Philippines, who presented with episodic fevers and weight loss to his primary care physician. Blood cultures ordered grew Burkholderia pseudomallei...
October 2017: Journal of Community Hospital Internal Medicine Perspectives
https://www.readbyqxmd.com/read/29026657/whole-genome-sequencing-to-investigate-a-non-clonal-melioidosis-cluster-on-a-remote-australian-island
#13
Derek S Sarovich, Stephanie N J Chapple, Erin P Price, Mark Mayo, Matthew T G Holden, Sharon J Peacock, Bart J Currie
Melioidosis is a tropical disease caused by the bacterium Burkholderia pseudomallei. Outbreaks are uncommon and can generally be attributed to a single point source and strain. We used whole-genome sequencing to analyse B. pseudomallei isolates collected from an historical 2-year long case cluster that occurred in a remote northern Australian indigenous island community, where infections were previously linked to a contaminated communal water supply. We analysed the genome-wide relatedness of the two most common multilocus sequence types (STs) involved in the outbreak, STs 125 and 126...
August 2017: Microbial Genomics
https://www.readbyqxmd.com/read/29024844/structural-characterisation-of-the-capsular-polysaccharide-expressed-by-burkholderia-thailandensis-strain-e555-wbii-pknock-kmr-and-assessment-of-the-significance-of-the-2-o-acetyl-group-in-immune-protection
#14
Marc Bayliss, Matthew I Donaldson, Sergey A Nepogodiev, Giulia Pergolizzi, Andrew E Scott, Nicholas J Harmer, Robert A Field, Joann L Prior
Burkholderia pseudomallei and its close relative B. mallei are human pathogens that are classified as Tier 1 bio-threat agents. Both organisms have previously been shown to constitutively produce a capsular polysaccharide (CPS) that is both a virulence determinant and protective antigen. Extraction and purification of CPS for use as a potential vaccine candidate requires containment level 3 laboratories which is expensive and time-consuming. B. thailandensis strain E555 is closely related to B. pseudomallei and B...
November 27, 2017: Carbohydrate Research
https://www.readbyqxmd.com/read/29021156/safety-and-accuracy-of-matrix-assisted-laser-desorption-ionization-time-of-flight-mass-spectrometry-maldi-tof-ms-to-identify-highly-pathogenic-organisms
#15
James T Rudrik, Marty K Soehnlen, Michael J Perry, Maureen Sullivan, Wanda Reiter-Kintz, Philip A Lee, Denise Pettit, Anthony Tran, Erin Swaney
Matrix-assisted laser desorption ionization -- time of flight mass spectrometry (MALDI-TOF MS) sample preparation methods including the direct, on-plate formic acid, and ethanol/formic acid tube extraction were evaluated for their ability to render highly pathogenic organisms non-viable and safe for handling in a Biosafety Level-2 laboratory. Of these, the tube extraction procedure was the most successful, with none of the tested strains surviving this sample preparation method. Tube extracts from several agents of bioterrorism and their near neighbors were analyzed in an eight laboratory study to examine the utility of the Bruker Biotyper and Vitek MS MALDI-TOF MS systems and their IVD, research use only, and Security-Relevant databases, as applicable, to accurately identify these agents...
October 11, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/29016340/presence-of-burkholderia-pseudomallei-in-soil-and-paddy-rice-water-in-a-rice-field-in-northeast-thailand-but-not-in-air-and-rainwater
#16
Catherine E L Ong, Gumphol Wongsuvan, Janet S W Chew, Tan Yian Kim, Low Hwee Teng, Premjit Amornchai, Vanaporn Wuthiekanun, Nicholas P J Day, Sharon J Peacock, Tan Yoke Cheng, Eric P H Yap, Direk Limmathurotsakul
Environmental Burkholderia pseudomallei has been postulated to be aerosolized during ploughing and heavy rain, and could result in inhalational melioidosis. Here, we determined the presence of B. pseudomallei in soil, paddy field water (PFW), air, and rainwater samples in a single rice paddy field in Ubon Ratchathani, northeast Thailand. In 2012, we collected 100 soil samples during the dry season, 10 PFW samples during the monsoon season, 77 air samples during ploughing (N = 31) and heavy rains (N = 46), and 60 rainwater samples during 12 rain events...
October 2, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/29016319/clinical-epidemiology-of-septic-arthritis-caused-by-burkholderia-pseudomallei-and-other-bacterial-pathogens-in-northeast-thailand
#17
Prapit Teparrukkul, Jiraphorn Nilsakul, Susanna Dunachie, Direk Limmathurotsakul
Septic arthritis is a medical emergency, and if not treated appropriately, it can be associated with high morbidity and mortality. Melioidosis, a serious infectious disease caused by the Gram-negative bacillus Burkholderia pseudomallei, is highly endemic in South and Southeast Asia and northern Australia. We reviewed the medical charts of adult patients admitted with bacterial septic arthritis at Sunpasitthiprasong Hospital, Ubon Ratchathani, northeast Thailand from January 2012 to December 2014. Bacterial septic arthritis was defined as one or more hot swollen joints with isolation of a pathogenic organism from an affected joint or from blood...
October 2, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28994855/melioidos-%C3%A2-en-viktig-diagnos-vid-sv%C3%A3-r-sjukdom-efter-utlandsresa
#18
Åsa Gylfe, Sara Cajander, Tara Wahab, Martin Angelin
Melioidosis, an important diagnosis in the severely ill traveler Melioidosis is a common tropical infection in Southeast Asia and is caused by the highly pathogenic soil bacterium Burkholderia pseudomallei. Diagnosis and treatment is often challenging due to variations in clinical presentation, limited antibiotic susceptibility and high risk of recurring infection. In this report, three cases with different clinical presentations are described.
October 9, 2017: Läkartidningen
https://www.readbyqxmd.com/read/28986923/crystal-structure-of-d-glycero-%C3%AE-d-manno-heptose-1-phosphate-adenylyltransferase-from-burkholderia-pseudomallei
#19
Jimin Park, Hyojin Kim, Suwon Kim, Daeun Lee, Mi-Sun Kim, Dong Hae Shin
The crystal structure of HldC from B. pseudomallei (BpHldC), the fourth enzyme of the heptose biosynthesis pathway, has been determined. BpHldC converts ATP and d-glycero-β-d-manno-heptose-1-phosphate into ADP-d-glycero-β -d-manno-heptose and pyrophosphate. The crystal structure of BpHldC belongs to the nucleotidyltransferase α/β phosphodiesterase superfamily sharing a common Rossmann-like α/β fold with a conserved T/HXGH sequence motif. The invariant catalytic key residues of BpHldC indicate that the core catalytic mechanism of BpHldC may be similar to that of other closest homologues...
October 7, 2017: Proteins
https://www.readbyqxmd.com/read/28978597/melioidosis-presenting-as-septicaemia-and-facial-nerve-palsy
#20
Tessa Antony, Swathy Moorthy, Anbumani Narayanaswamy, Preetam Arthur
A 43-year-old farmer presented with acute onset pneumonia, septicaemia and peripheral facial nerve palsy (left side). Burkholderia pseudomallei was isolated from the blood culture of the patient. The patient was successfully treated with intravenous meropenem and oral cotrimoxazole for 2 weeks followed by maintenance therapy with cotrimoxazole. The case is reported to increase awareness among the clinicians and microbiologists regarding melioidosis.
October 4, 2017: BMJ Case Reports
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