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https://www.readbyqxmd.com/read/29338592/whole-genome-sequencing-characterization-of-bloodstream-infection-causing-hypervirulent-klebsiella-pneumoniae-of-capsular-serotype-k2-and-st374
#1
Xiaoli Wang, Yingzhou Xie, Gang Li, Jialin Liu, Xiaobin Li, Lijun Tian, Jingyong Sun, Hong-Yu Ou, Hongping Qu
Hypervirulent K. pneumoniae variants (hvKP) have been increasingly reported worldwide, causing metastasis of severe infections such as liver abscesses and bacteremia. The capsular serotype K2 hvKP strains show diverse multi-locus sequence types (MLSTs), but with limited genetics and virulence information. In this study, we report a hypermucoviscous K. pneumoniae strain, RJF293, isolated from a human bloodstream sample in a Chinese hospital. It caused a metastatic infection and fatal septic shock in a critical patient...
January 17, 2018: Virulence
https://www.readbyqxmd.com/read/29335553/mutations-in-ppe38-block-pe_pgrs-secretion-and-increase-virulence-of-mycobacterium-tuberculosis
#2
Louis S Ates, Anzaan Dippenaar, Roy Ummels, Sander R Piersma, Aniek D van der Woude, Kim van der Kuij, Fabien Le Chevalier, Dulce Mata-Espinosa, Jorge Barrios-Payán, Brenda Marquina-Castillo, Carolina Guapillo, Connie R Jiménez, Arnab Pain, Edith N G Houben, Robin M Warren, Roland Brosch, Rogelio Hernández-Pando, Wilbert Bitter
Mycobacterium tuberculosis requires a large number of secreted and exported proteins for its virulence, immune modulation and nutrient uptake. Most of these proteins are transported by the different type VII secretion systems1,2. The most recently evolved type VII secretion system, ESX-5, secretes dozens of substrates belonging to the PE and PPE families, which are named for conserved proline and glutamic acid residues close to the amino terminus3,4. However, the role of these proteins remains largely elusive 1 ...
January 15, 2018: Nature Microbiology
https://www.readbyqxmd.com/read/29319515/the-determination-and-correlation-of-various-virulence-genes-esbl-serum-bactericidal-effect-and-biofilm-formation-of-clinical-isolated-classical-klebsiella-pneumoniae-and-hypervirulent-klebsiella-pneumoniae-from-respiratory-tract-infected-patients
#3
Rambha K Shah, Zhao H Ni, Xiao Y Sun, Guo Q Wang, Fan Li
Klebsiella pneumoniae strains that are commonly recognized by clinicians and microbiologists are termed as classical K. pneumoniae (cKP). A strain with capsule-associated mucopolysaccharide web is known as hypervirulent K. pneumoniae (hvKP) as it enhances the serum resistant and biofilm production. Aim is to determine and correlate various virulence genes, ESBL, serum bactericidal effect and biofilm formation of clinical isolated cKP and hvKP from respiratory tract infected patients. A total of 96 K. pneumoniae strains were isolated from sputum of respiratory tract infected patients...
December 4, 2017: Polish Journal of Microbiology
https://www.readbyqxmd.com/read/29311082/deletion-of-ada2-increases-antifungal-drug-susceptibility-and-virulence-in-candida-glabrata
#4
Shang-Jie Yu, Ya-Lin Chang, Ying-Lien Chen
Candida glabrata, the second most frequent cause of candidiasis after Candida albicans, is an emerging human fungal pathogen that is intrinsically drug tolerant. Currently, studies of C. glabrata genes involved in drug tolerance are limited. Ada2, a component serving as a transcription adaptor of the Spt-Ada-Gcn5 acetyltransferase (SAGA) complex, is required for antifungal drug tolerance and virulence in C. albicans However, its roles in C. glabrata remain elusive. In this study, we found that ada2 mutants demonstrated severe growth defects at 40°C but only mild defects at 37°C or 25°C...
January 8, 2018: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29287985/cellular-interactions-of-covr-s-mutant-group-a-streptococci
#5
Emma L Langshaw, Manisha Pandey, Michael F Good
Group A Streptococci (GAS) are responsible for a wide array of non-invasive and invasive diseases and varying immune sequelae with high rates of mortality and morbidity. GAS strains with a mutation in their covR/S regulatory system are hypervirulent with an increased capacity for causing invasive disease. CovR/S mutants augment their virulence through the up-regulation of important virulence factors and target host immune surveillance primarily by inhibiting neutrophils. An in-depth understanding of the immunopathogenesis of covR/S mutants will facilitate the development of vaccine strategies and design...
December 26, 2017: Microbes and Infection
https://www.readbyqxmd.com/read/29286017/a-case-of-invasive-infection-caused-by-a-highly-virulent-strain-of-klebsiella-pneumoniae-displaying-hypermucoviscosity-in-a-patient-with-hepatic-involvement-without-liver-abscess
#6
Margherita Scapaticci, Marta Biscaro, Francesco Burelli, Lucio Cadamuro, Renzo Biscaro, Andrea Bartolini
Klebsiella pneumoniae is an opportunistic nosocomial pathogen belonging to the Enterobacteriaceae family that is associated with a wide range of infections. In the 1980s a new hypervirulent (hypermucoviscous) variant of Klebsiella pneumoniae (hvKP) emerged in southeast Asia and is now increasingly spreading to Western countries due to an invasive syndrome. hvKP isolates can cause serious, life-threatening community-acquired infections in younger healthy hosts, including liver abscess, pneumonia, meningitis and endophthalmitis...
December 1, 2017: Le Infezioni in Medicina
https://www.readbyqxmd.com/read/29273940/investigation-of-clostridium-difficile-ribotypes-in-symptomatic-patients-of-a-german-pediatric-oncology-center
#7
Arne Simon, Markus Mock, Norbert Graf, Lutz von Müller
In a German pediatric oncology unit, the attending physicians diagnosed 27 cases of Clostridium difficile-associated disease (CDI) from January 01, 2010 to October 31, 2013. This refers to a CDI incidence density of 2.0/1000 inpatient days. According to the hospital hygiene standard, symptomatic patients with CDI were kept in contact isolation. Most patients (median age 8.2 years) suffered from acute lymphoblastic leukemia; 88.9% were treated with broad-spectrum antibiotics during the preceding 4 weeks. 29...
December 22, 2017: European Journal of Pediatrics
https://www.readbyqxmd.com/read/29244079/a-non-hemolytic-group-b-streptococcus-strain-exhibits-hypervirulence
#8
Claire Gendrin, Jay Vornhagen, Blair Armistead, Pallavi Singh, Christopher Whidbey, Sean Merillat, David Knupp, Robert Parker, Lisa M Rogers, Phoenicia Quach, Lakshminarayan M Iyer, L Aravind, Shannon D Manning, David M Aronoff, Lakshmi Rajagopal
Group B Streptococci (GBS) are gram-positive bacteria that are a leading cause of neonatal infections. Most invasive isolates are -hemolytic and hemolytic activity is critical for GBS virulence. While non-hemolytic GBS strains are occasionally isolated, they are often thought to be virulence attenuated. Here, we show that a non-hemolytic GBS strain (GB37) isolated from a septic neonate exhibits hypervirulence. Substitution of tryptophan to leucine (W297L) in the sensor histidine kinase CovS results in constitutive kinase signaling, leading to decreased hemolysis and increased activity of the GBS hyaluronidase, HylB...
December 13, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/29238932/risk-factors-and-clinical-outcomes-of-hypervirulent-klebsiella-pneumoniae-induced-bloodstream-infections
#9
Jiayang Li, Jianan Ren, Weiping Wang, Gefei Wang, Guosheng Gu, Xiuwen Wu, Ying Wang, Mei Huang, Jieshou Li
The prevalence of hypervirulent Klebsiella pneumoniae (hvKP) is high in China, but clinical characteristics and outcomes of hvKP induced bloodstream infections (BSIs) are not clear. The purpose of the present study was to determine the risk factors and clinical outcomes of hvKP-BSIs in populations admitted in a teaching hospital of Nanjing, China. The genetic characteristics and antibiotic resistance patterns of the hvKP strains were further analyzed. A retrospective study was conducted in 143 patients with K...
December 14, 2017: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/29235503/inactivation-of-the-dnak-gene-in-clostridium-difficile-630-%C3%AE-erm-yields-a-temperature-sensitive-phenotype-and-increases-biofilm-forming-ability
#10
Shailesh Jain, Deborah Smyth, Barry M G O'Hagan, John T Heap, Geoff McMullan, Nigel P Minton, Nigel G Ternan
Clostridium difficile infection is a growing problem in healthcare settings worldwide and results in a considerable socioeconomic impact. New hypervirulent strains and acquisition of antibiotic resistance exacerbates pathogenesis; however, the survival strategy of C. difficile in the challenging gut environment still remains incompletely understood. We previously reported that clinically relevant heat-stress (37-41 °C) resulted in a classical heat-stress response with up-regulation of cellular chaperones...
December 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29234496/persistent-diarrhoea-in-a-5-month-old-baby-carrying-vibrio-cholerae-nono1-nono139-producing-haitian-cholera-toxin
#11
P Kumar, S Karmakar, R Prasad, R Chopra, S Khandelwal, S Gupta, A C Dhariwal, P Yadav, P K Yadava
Cholera toxin (CT) is the principal virulence factor of Vibrio cholerae for fatal cholera diarrhoea. Serogroups O1 and O139 harbour CT and are known to be epidemic strains. The remaining serogroups (nonO1/nonO139) are non-toxigenic and may be associated with mild disease. O1 serogroup emerged with a variant of CT known as Haitian cholera toxin (HCT). The HCT strains are hypervirulent and have been associated with severe cholera outbreaks in India, Western Africa and Haiti. Here, we report the presence of HCT (ctxB7) in a nonO1/nonO139 isolate causing persistent diarrhoea...
January 2018: New Microbes and New Infections
https://www.readbyqxmd.com/read/29233459/invasive-meningococcal-disease-due-to-ciprofloxacin-resistant-neisseria-meningitidis-sequence-type-4821-the-first-case-in-japan
#12
Yu Kawasaki, Kousaku Matsubara, Hideyuki Takahashi, Masatomo Morita, Makoto Ohnishi, Masayuki Hori, Kenichi Isome, Aya Iwata, Hiroyuki Nigami, Mami Ikemachi, Go Yamamoto, Kiyofumi Ohkusu
We present a 4-year-old girl who developed invasive meningococcal disease (IMD) caused by Neisseria meningitidis serogroup C sequence type (ST)-4821. She was hospitalized due to fever, vomiting, rash and altered consciousness. Serogroup C N. meningitidis was isolated from blood culture taken on admission and was confirmed by matrix-assisted laser desorption ionization time-of-flight mass spectrometry, a biochemical test, and molecular microbiological analysis. The patient was successfully treated with 50 mg/kg ceftriaxone every 12 hours for 7 days without any complications...
December 7, 2017: Journal of Infection and Chemotherapy: Official Journal of the Japan Society of Chemotherapy
https://www.readbyqxmd.com/read/29228178/genome-sequence-analysis-of-a-hypermucoviscous-hypervirulent-and-mdr-ctx-m-15-k19-st29-klebsiella-pneumoniae-isolated-from-human-infection
#13
Quézia Moura, Fernanda Esposito, Miriam R Fernandes, Maria Espinoza-Muñoz, Tiago A Souza, Silvia R Santos, Louise Cerdeira, Valéria Cassettari, Nilton Lincopan
The emergence of hypervirulent Klebsiella pneumoniae (hvKP) with multidrug-resistance (MDR) profile is a worrisome public health issue. We report the first draft genome sequence of a hypermucoviscous (positive string test) and MDR K. pneumoniae serotype K19, belonging to ST29, isolated from human infection. This strain harboured multiple antimicrobial resistance genes, including blaCTX-M-15, besides yersiniabactin and type 3 fimbriae virulence genes. In vivo experiments carried out with the Galleria mellonella infection model revealed that K...
December 6, 2017: Pathogens and Disease
https://www.readbyqxmd.com/read/29209595/antimicrobial-resistance-of-hypervirulent-klebsiella-pneumoniae-epidemiology-hypervirulence-associated-determinants-and-resistance-mechanisms
#14
REVIEW
Chang-Ro Lee, Jung Hun Lee, Kwang Seung Park, Jeong Ho Jeon, Young Bae Kim, Chang-Jun Cha, Byeong Chul Jeong, Sang Hee Lee
Klebsiella pneumoniae is one of the most clinically relevant species in immunocompromised individuals responsible for community-acquired and nosocomial infections, including pneumonias, urinary tract infections, bacteremias, and liver abscesses. Since the mid-1980s, hypervirulent K. pneumoniae, generally associated with the hypermucoviscosity phenotype, has emerged as a clinically significant pathogen responsible for serious disseminated infections, such as pyogenic liver abscesses, osteomyelitis, and endophthalmitis, in a generally younger and healthier population...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/29205138/virulence-genes-in-isolates-of-klebsiella-pneumoniae-from-the-uk-during-2016-including-among-carbapenemase-gene-positive-hypervirulent-k1-st23-and-non-hypervirulent-types-st147-st15-and-st383
#15
Jane F Turton, Zoë Payne, Amy Coward, Katie L Hopkins, Jack A Turton, Michel Doumith, Neil Woodford
PURPOSE: Klebsiella pneumoniae is a concern because of its multidrug resistance and the ability of hypervirulent types, especially capsular type K1-clonal complex 23 (K1-CC23), to cause community-acquired, life-threatening infections. Hypervirulent types carry an array of virulence genes including rmpA/rmpA2, coding for capsule up-regulation. We sought to identify isolates carrying these elements among submissions to the UK national reference laboratory during 2016. METHODOLOGY: Virulence elements and carbapenemase genes were sought by PCR or from whole genome sequences...
December 5, 2017: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/29193949/-case-series-of-clostridium-difficile-nap1-027-bi-with-novels-treatments
#16
Silvia Esmeralda Pérez-Topete, Tomás Miranda-Aquino, Juan Jacobo Ayala-Gaytan
BACKGROUND: Clostridium difficile is a spore-forming bacterium, producing exotoxins, causing potentially fatal nosocomial diarrhea. They have recently reported outbreaks of C. difficile ribotype 027, which is characterized by a hypervirulent strain and high resistance to standard therapy. CLINICAL CASE: We present three cases of Clostridium difficile NAP1/027/BI associated infection, they were presented with different clinical manifestations. Two of the patients were successfully treated with the combination of vancomycin plus tigecycline...
September 2017: Revista Médica del Instituto Mexicano del Seguro Social
https://www.readbyqxmd.com/read/29190804/virulence-genes-and-subclone-status-as-markers-of-experimental-virulence-in-a-murine-sepsis-model-among-escherichia-coli-sequence-type-131-clinical-isolates-from-spain
#17
Irene Merino, Stephen B Porter, Brian D Johnston, Connie Clabots, Evelyn Shaw, Juan Pablo Horcajada, Rafael Cantón, Patricia Ruiz-Garbajosa, James R Johnson
OBJECTIVE: To assess experimental virulence among sequence type 131 (ST131) Escherichia coli bloodstream isolates in relation to virulence genotype and subclone. METHODS: We analysed 48 Spanish ST131 bloodstream isolates (2010) by PCR for ST131 subclone status (H30Rx, H30 non-Rx, or non-H30), virulence genes (VGs), and O-type. Then we compared these traits with virulence in a murine sepsis model, as measured by illness severity score (ISS) and rapid lethality (mean ISS ≥ 4)...
2017: PloS One
https://www.readbyqxmd.com/read/29174729/prevalence-of-the-clostridium-difficile-bi-nap1-027-strain-across-the-united-states-veterans-health-administration
#18
S E Giancola, R J Williams, C A Gentry
OBJECTIVES: The increased incidence and severity of Clostridium difficile infection (CDI) are thought to result partly from the emergence of the hypervirulent BI/NAP1/027 strain. Limited recent data are available on the prevalence of BI/NAP1/027 in the United States (US). The objective of this study was to assess the recent prevalence of BI/NAP1/027 within the US Veterans Health Administration (VHA). METHODS: Patients with CDI at any Veterans Affairs Medical Center found to routinely test for the presence of BI/NAP1/027 during the study period were included between 1 June 2011 and 30 June 2016 in this retrospective, observational, nationwide study...
November 22, 2017: Clinical Microbiology and Infection
https://www.readbyqxmd.com/read/29161712/clostridium-difficile-infection-in-the-nephrology-ward
#19
Sylwia Dudzicz, Marcin Adamczak, Andrzej Więcek
Clostridium difficile is currently the most frequently identified pathogen causing antibiotic-associated diarrhea and the main cause of nosocomial diarrhea. In recent years, increases incidence of infection, severe infection, recurrent infection and mortality from Clostridium difficile infection (CDI) have been observed. This may be a consequence of excessive antibiotic use and spread of the hypervirulent epidemic BI/NAP1/027 strain of Clostridium difficile. The main risk factors for CDI are: antibiotic therapy, previous hospitalizations and number of comorbid conditions...
November 21, 2017: Kidney & Blood Pressure Research
https://www.readbyqxmd.com/read/29158405/origin-evolution-and-global-transmission-of-community-acquired-staphylococcus-aureus-st8
#20
Lena Strauß, Marc Stegger, Patrick Eberechi Akpaka, Abraham Alabi, Sebastien Breurec, Geoffrey Coombs, Beverly Egyir, Anders Rhod Larsen, Frederic Laurent, Stefan Monecke, Georg Peters, Robert Skov, Birgit Strommenger, François Vandenesch, Frieder Schaumburg, Alexander Mellmann
USA300 is a pandemic clonal lineage of hypervirulent, community-acquired, methicillin-resistant Staphylococcus aureus (CA-MRSA) with specific molecular characteristics. Despite its high clinical relevance, the evolutionary origin of USA300 remained unclear. We used comparative genomics of 224 temporal and spatial diverse S. aureus isolates of multilocus sequence type (ST) 8 to reconstruct the molecular evolution and global dissemination of ST8, including USA300. Analyses of core SNP diversity and accessory genome variations showed that the ancestor of all ST8 S...
November 20, 2017: Proceedings of the National Academy of Sciences of the United States of America
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