keyword
MENU ▼
Read by QxMD icon Read
search

hypervirulent

keyword
https://www.readbyqxmd.com/read/28223459/evolution-and-epidemiology-of-multidrug-resistant-klebsiella-pneumoniae-in-the-united-kingdom-and-ireland
#1
Danesh Moradigaravand, Veronique Martin, Sharon J Peacock, Julian Parkhill
Klebsiella pneumoniae is a human commensal and opportunistic pathogen that has become a leading causative agent of hospital-based infections over the past few decades. The emergence and global expansion of hypervirulent and multidrug-resistant (MDR) clones of K. pneumoniae have been increasingly reported in community-acquired and nosocomial infections. Despite this, the population genomics and epidemiology of MDR K. pneumoniae at the national level are still poorly understood. To obtain insights into these, we analyzed a systematic large-scale collection of invasive MDR K...
February 21, 2017: MBio
https://www.readbyqxmd.com/read/28221931/thermal-resistance-of-clostridium-difficile-spores-in-peptone-water-and-pork-meat
#2
Mauricio Redondo-Solano, Dennis E Burson, Harshavardhan Thippareddi
The thermal resistance of four strains of Clostridium difficile spores (three hypervirulent and one nonhypervirulent) in peptone water (PW) and pork meat was evaluated individually at 70, 75, 80, 85, and 90°C using two recovery methods (taurocholate and lysozyme). PW or meat was inoculated with C. difficile spores and mixed to obtain ca. 5.0 log CFU/ml or 4.0 log CFU/g, respectively. The D-values of C. difficile spores in PW ranged from 7.07 to 22.14 h, 1.42 to 3.82 h, 0.35 to 0.59 h, 4.93 to 5.95 min, and 1...
September 2016: Journal of Food Protection
https://www.readbyqxmd.com/read/28193909/rv2299c-a-novel-dendritic-cell-activating-antigen-of-mycobacterium-tuberculosis-fused-esat-6-subunit-vaccine-confers-improved-and-durable-protection-against-the-hypervirulent-strain-hn878-in-mice
#3
Han-Gyu Choi, Seunga Choi, Yong Woo Back, Seungwha Paik, Hye-Soo Park, Woo Sik Kim, Hongmin Kim, Seung Bin Cha, Chul Hee Choi, Sung Jae Shin, Hwa-Jung Kim
Understanding functional interactions between DCs and antigens is necessary for achieving an optimal and desired immune response during vaccine development. Here, we identified and characterized protein Rv2299c (heat-shock protein 90 family), which effectively induced DC maturation. The Rv2299c-maturated DCs showed increased expression of surface molecules and production of proinflammatory cytokines. Rv2299c induced these effects by binding to TLR4 and stimulating the downstream MyD88-, MAPK- and NF-κB-dependent signaling pathways...
February 10, 2017: Oncotarget
https://www.readbyqxmd.com/read/28181409/metabolic-diversity-of-the-emerging-pathogenic-lineages-of-klebsiella-pneumoniae
#4
Camille Blin, Virginie Passet, Marie Touchon, Eduardo P C Rocha, Sylvain Brisse
Multidrug resistant and hypervirulent clones of Klebsiella pneumoniae are emerging pathogens. To understand the association between genotypic and phenotypic diversity in this process, we combined genomic, phylogenomic, and phenotypic analysis of a diverse set of K. pneumoniae and closely related species. These species were able to use an unusually large panel of metabolic substrates for growth, many of which were shared between all strains. We analysed the substrates used by only a fraction of the strains, identified some of their genetic basis, and found that many could not be explained by the phylogeny of the strains...
February 9, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28179514/historical-amphibian-declines-and-extinctions-in-brazil-linked-to-chytridiomycosis
#5
Tamilie Carvalho, C Guilherme Becker, Luís Felipe Toledo
The recent increase in emerging fungal diseases is causing unprecedented threats to biodiversity. The origin of spread of the frog-killing fungus Batrachochytrium dendrobatidis (Bd) is a matter of continued debate. To date, the historical amphibian declines in Brazil could not be attributed to chytridiomycosis; the high diversity of hosts coupled with the presence of several Bd lineages predating the reported declines raised the hypothesis that a hypervirulent Bd genotype spread from Brazil to other continents causing the recent global amphibian crisis...
February 8, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28154286/bacterial-meningitis-caused-by-hypervirulent-klebsiella-pneumoniae-capsular-genotype-k54-with-development-of-granuloma-like-nodal-enhancement-in-the-brain-during-the-subacute-phase
#6
Yudai Iwasaki, Ryota Inokuchi, Sohei Harada, Kotaro Aoki, Yoshikazu Ishii, Kazuaki Shinohara
A 72-year-old man was admitted to the emergency department due to coma. The cerebrospinal fluid cell count was 40,080 cells/μL, and Klebsiella pneumoniae was detected on culture. Stretching the bacterial colonies on an agar plate showed the formation of a viscous string with a length exceeding 5 mm, indicating hypervirulent K. pneumoniae (hv-KP). A genome analysis suggested hv-KP capsular genotype K54 with sequence type 29. Although no brain abscess was detected on contrast-enhanced computed tomography on Day 4 or on magnetic resonance imaging (MRI) on Day 7, contrast-enhanced MRI on Day 23 showed granuloma-like nodal enhancement on the surface of the left insula...
2017: Internal Medicine
https://www.readbyqxmd.com/read/28149676/genomic-insight-into-pathogenicity-of-dematiaceous-fungus-corynespora-cassiicola
#7
Hong Keat Looi, Yue Fen Toh, Su Mei Yew, Shiang Ling Na, Yung-Chie Tan, Pei-Sin Chong, Jia-Shiun Khoo, Wai-Yan Yee, Kee Peng Ng, Chee Sian Kuan
Corynespora cassiicola is a common plant pathogen that causes leaf spot disease in a broad range of crop, and it heavily affect rubber trees in Malaysia (Hsueh, 2011; Nghia et al., 2008). The isolation of UM 591 from a patient's contact lens indicates the pathogenic potential of this dematiaceous fungus in human. However, the underlying factors that contribute to the opportunistic cross-infection have not been fully studied. We employed genome sequencing and gene homology annotations in attempt to identify these factors in UM 591 using data obtained from publicly available bioinformatics databases...
2017: PeerJ
https://www.readbyqxmd.com/read/28132768/bacteremia-and-other-body-site-infection-caused-by-hypervirulent-and-classic-klebsiella-pneumoniae
#8
Hua Wu, Dongdong Li, Haijian Zhou, Yunfang Sun, Ling Guo, Dingxia Shen
OBJECTIVES: To investigate bacteremia and other body site infection caused by hypervirulent Klebsiella pneumoniae (hvKP), a recently recognized pathogen of invasive infection, and classic Klebsiella pneumoniae (cKP), a very common organism associated with many kinds of nosocomial infection. METHODS: Clinical information obtained from patients with both bacteremia and other body site infections caused by hvKP and/or cKP was retrospectively reviewed. Homo-hvKP (or homo-cKP) was defined as homologous hvKP (or cKP) strains from different body sites in each individual patient according to string test, virulence gene amplification and PFGE pattern...
January 26, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28125650/development-of-a-novel-vaccine-containing-binary-toxin-for-the-prevention-of-clostridium-difficile-disease-with-enhanced-efficacy-against-nap1-strains
#9
Susan Secore, Su Wang, Julie Doughtry, Jinfu Xie, Matt Miezeiewski, Richard R Rustandi, Melanie Horton, Rachel Xoconostle, Bei Wang, Catherine Lancaster, Adam Kristopeit, Sheng-Ching Wang, Sianny Christanti, Salvatore Vitelli, Marie-Pierre Gentile, Aaron Goerke, Julie Skinner, Erica Strable, David S Thiriot, Jean-Luc Bodmer, Jon H Heinrichs
Clostridium difficile infections (CDI) are a leading cause of nosocomial diarrhea in the developed world. The main virulence factors of the bacterium are the large clostridial toxins (LCTs), TcdA and TcdB, which are largely responsible for the symptoms of the disease. Recent outbreaks of CDI have been associated with the emergence of hypervirulent strains, such as NAP1/BI/027, many strains of which also produce a third toxin, binary toxin (CDTa and CDTb). These hypervirulent strains have been associated with increased morbidity and higher mortality...
2017: PloS One
https://www.readbyqxmd.com/read/28124734/importance-of-whole-genome-sequencing-for-the-assessment-of-outbreaks-in-diagnostic-laboratories-analysis-of-a-case-series-of-invasive-streptococcus-pyogenes-infections
#10
F Tagini, B Aubert, N Troillet, T Pillonel, G Praz, P A Crisinel, G Prod'hom, S Asner, G Greub
Outbreaks of Streptococcus pyogenes hypervirulent clones are constant public health threats. In western Switzerland, an increase of severe cases of S. pyogenes invasive infections was observed between December 2015 and March 2016. Our aim was (i) to investigate these cases by the use of Whole Genome Sequencing (WGS) and (ii) to determine the specific virulome and resistome of each isolate in order to undertake adequate public health measures. Eleven Streptococcus pyogenes strains isolated from 11 patients with severe invasive infections between December 13, 2015 and March 12, 2016 were included in our study...
January 26, 2017: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/28119473/autoinducer-2-signaling-via-the-phosphotransferase-frua-drives-galactose-utilization-by-streptococcus-pneumoniae-resulting-in-hypervirulence
#11
Claudia Trappetti, Lauren J McAllister, Austen Chen, Hui Wang, Adrienne W Paton, Marco R Oggioni, Christopher A McDevitt, James C Paton
: Communication between bacterial cells is crucial for the coordination of diverse cellular processes that facilitate environmental adaptation and, in the case of pathogenic species, virulence. This is achieved by the secretion and detection of small signaling molecules called autoinducers, a process termed quorum sensing. To date, the only signaling molecule recognized by both Gram-positive and Gram-negative bacteria is autoinducer 2 (AI-2), synthesized by the metabolic enzyme LuxS (S-ribosylhomocysteine lyase) as a by-product of the activated methyl cycle...
January 24, 2017: MBio
https://www.readbyqxmd.com/read/28114361/studies-on-the-virome-of-the-entomopathogenic-fungus-beauveria-bassiana-reveal-novel-dsrna-elements-and-mild-hypervirulence
#12
Ioly Kotta-Loizou, Robert H A Coutts
The entomopathogenic fungus Beauveria bassiana has a wide host range and is used as a biocontrol agent against arthropod pests. Mycoviruses have been described in phytopathogenic fungi while in entomopathogenic fungi their presence has been reported only rarely. Here we show that 21.3% of a collection of B. bassiana isolates sourced from worldwide locations, harbor dsRNA elements. Molecular characterization of these elements revealed the prevalence of mycoviruses belonging to the Partitiviridae and Totiviridae families, the smallest reported virus to date, belonging to the family Narnaviridae, and viruses unassigned to a family or genus...
January 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28107386/regulation-of-pi-2b-pilus-expression-in-hypervirulent-streptococcus-agalactiae-st-17-bm110
#13
Bruno Périchon, Noémi Szili, Laurence du Merle, Isabelle Rosinski-Chupin, Myriam Gominet, Samuel Bellais, Claire Poyart, Patrick Trieu-Cuot, Shaynoor Dramsi
The widely spread Streptococcus agalactiae (also known as Group B Streptococcus, GBS) "hypervirulent" ST17 clone is strongly associated with neonatal meningitis. The PI-2b locus is mainly found in ST17 strains but is also present in a few non ST17 human isolates such as the ST-7 prototype strain A909. Here, we analysed the expression of the PI-2b pilus in the ST17 strain BM110 as compared to the non ST17 A909. Comparative genome analyses revealed the presence of a 43-base pair (bp) hairpin-like structure in the upstream region of PI-2b operon in all 26 ST17 genomes, which was absent in the 8 non-ST17 strains carrying the PI-2b locus...
2017: PloS One
https://www.readbyqxmd.com/read/28104658/draft-genome-sequence-of-hypervirulent-and-vaccine-candidate-streptococcus-suis-strain-sc19
#14
Lin Teng, Xingxing Dong, Yang Zhou, Zhiwei Li, Limei Deng, Huanchun Chen, Xiaohong Wang, Jinquan Li
Streptococcus suis, a zoonotic bacterium found primarily in pigs, has been recognized recently as an emerging pathogen of humans. Herein, we describe the genome of Streptococcus suis strain SC19, a hypervirulent and vaccine candidate strain isolated from a pig amid the 2005 outbreak in China.
January 19, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28089629/a-rack1-like-protein-regulates-hyphal-morphogenesis-root-entry-and-in-vivo-virulence-in-verticillium-dahlia
#15
Lei Yuan, Yaxin Su, Shuai Zhou, Yigao Feng, Wangzhen Guo, Xinyu Wang
To identify key genes expressed in Verticillium dahliae in early stages of infection of cotton roots, spore suspensions of eight V. dahliae isolates with different virulence levels were induced by cotton roots and genes expressed in these isolates during the early stages of infection were profiled. A gene that was differentially expressed between highly and less virulent strains was identified. Cloning and bioinformatics analysis of the gene suggested that it belongs to the putative Gβ-like/RACK1 protein family, and has seven WD40 domains...
January 9, 2017: Fungal Genetics and Biology: FG & B
https://www.readbyqxmd.com/read/28080992/microevolutionary-traits-and-comparative-population-genomics-of-the-emerging-pathogenic-fungus-cryptococcus-gattii
#16
Rhys A Farrer, Kerstin Voelz, Daniel A Henk, Simon A Johnston, Matthew C Fisher, Robin C May, Christina A Cuomo
Emerging fungal pathogens cause an expanding burden of disease across the animal kingdom, including a rise in morbidity and mortality in humans. Yet, we currently have only a limited repertoire of available therapeutic interventions. A greater understanding of the mechanisms of fungal virulence and of the emergence of hypervirulence within species is therefore needed for new treatments and mitigation efforts. For example, over the past decade, an unusual lineage of Cryptococcus gattii, which was first detected on Vancouver Island, has spread to the Canadian mainland and the Pacific Northwest infecting otherwise healthy individuals...
December 5, 2016: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28060047/genotype-characterization-of-group-b-streptococcus-isolated-from-infants-with-invasive-diseases-in-south-korea
#17
Hyun Mi Kang, Hoan Jong Lee, Hyunju Lee, Dae Sun Jo, Hye Soo Lee, Taek Soo Kim, Jeong Hwan Shin, Ki Wook Yun, Bongjin Lee, Eun Hwa Choi
BACKGROUND: Group B Streptococcus (GBS) is one of the leading causes of invasive infections in infants. This study aimed to investigate the genotypic diversity of GBS causing invasive infections in infants and to observe the prevalence of the highly virulent clone in South Korea. METHODS: Invasive strains of GBS were collected prospectively from infants admitted at four hospitals during 1995 to 2015. Serotype and multilocus sequence typing was determined. All isolates underwent PCR amplification to detect the presence of the hypervirulent surface adhesin (hvgA) gene...
January 3, 2017: Pediatric Infectious Disease Journal
https://www.readbyqxmd.com/read/28043225/australian-meningococcal-surveillance-programme-annual-report-2015
#18
Monica M Lahra, Rodney P Enriquez
In 2015, there were 174 laboratory-confirmed cases of invasive meningococcal disease analysed by the Australian National Neisseria Network. This number was higher than that reported in 2013 and 2014, which were the lowest and second-lowest totals reported, respectively, since inception of the Australian Meningococcal Surveillance Programme in 1994. Probable and laboratory confirmed invasive meningococcal disease (IMD) is notifiable in Australia. There were 182 IMD cases notified to the National Notifiable Diseases Surveillance System in 2015, again, higher than in 2013 and 2014, which were the lowest and second-lowest totals of IMD cases recorded, respectively, by this system...
December 24, 2016: Communicable Diseases Intelligence Quarterly Report
https://www.readbyqxmd.com/read/27965935/clinical-and-genomic-analysis-of-liver-abscess-causing-klebsiella-pneumoniae-identifies-new-liver-abscess-associated-virulence-genes
#19
Meiping Ye, Jianfei Tu, Jianping Jiang, Yingmin Bi, Weibo You, Yanliang Zhang, Jianmin Ren, Taohui Zhu, Zhuo Cao, Zuochun Yu, Chuxiao Shao, Zhen Shen, Baixing Ding, Jinyi Yuan, Xu Zhao, Qinglan Guo, Xiaogang Xu, Jinwei Huang, Minggui Wang
Hypervirulent variants of Klebsiella pneumoniae (hvKp) that cause invasive community-acquired pyogenic liver abscess (PLA) have emerged globally. Little is known about the virulence determinants associated with hvKp, except for the virulence genes rmpA/A2 and siderophores (iroBCD/iucABCD) carried by the pK2044-like large virulence plasmid. Here, we collected most recent clinical isolates of hvKp from PLA samples in China, and performed clinical, molecular, and genomic sequencing analyses. We found that 90.9% (40/44) of the pathogens causing PLA were K...
2016: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/27938243/the-dinj-rele-toxin-antitoxin-system-suppresses-bacterial-proliferation-and-virulence-of-xylella-fastidiosa-in-grapevine
#20
Lindsey Burbank, Drake C Stenger
Xylella fastidiosa, the causal agent of Pierce's disease of grapes, is a slow-growing, xylem limited, bacterial pathogen. Disease progression is characterized by systemic spread of the bacterium through xylem vessel networks, causing leaf scorching symptoms, senescence and vine decline. It appears to be advantageous to this pathogen to avoid excessive blockage of xylem vessels, as living bacterial cells are generally found in plant tissue with low bacterial cell density and minimal scorching symptoms. The DinJ/RelE toxin-antitoxin (TA) system is characterized here for a role in controlling bacterial proliferation and population size during plant colonization...
December 12, 2016: Phytopathology
keyword
keyword
79828
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"