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https://www.readbyqxmd.com/read/28409125/colibactin-contributes-to-the-hypervirulence-of-pks-k1-cc23-klebsiella-pneumoniae-in-mouse-meningitis-infections
#1
Min-Chi Lu, Ying-Tsong Chen, Ming-Ko Chiang, Yao-Chen Wang, Pei-Yi Hsiao, Yi-Jhen Huang, Ching-Ting Lin, Ching-Chang Cheng, Chih-Lung Liang, Yi-Chyi Lai
Klebsiella pneumoniae is the most common pathogen of community-acquired meningitis in Taiwan. However, the lack of a physiologically relevant meningitis model for K. pneumoniae has impeded research into its pathogenesis mechanism. Based on the core genome MLST analyses, the hypervirulent K1 K. pneumoniae strains, which are etiologically implicated in adult meningitis, mostly belong to a single clonal complex, CC23. Some K1 CC23 K. pneumoniae strains carry a gene cluster responsible for colibactin production...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28402698/hypervirulence-and-hypermucoviscosity-two-different-but-complementary-klebsiella-spp-phenotypes
#2
Juan Carlos Catalán-Nájera, Ulises Garza-Ramos, Humberto Barrios-Camacho
Since the hypermucoviscous variants of Klebsiella pneumoniae were first reported, many cases of primary liver abscesses and other invasive infections caused by this pathogen have been described worldwide. Hypermucoviscosity is a phenotypic feature characterized by the formation of a viscous filament ≥5 mm when a bacterial colony is stretched by a bacteriological loop; this is the so-called positive string test. Hypermucoviscosity appears to be associated with this unusual and aggressive type of infection, and therefore, the causal strains are considered hypervirulent...
April 12, 2017: Virulence
https://www.readbyqxmd.com/read/28400757/streptococcus-agalactiae-causing-neonatal-infections-in-portugal-2005-2015-diversification-and-emergence-of-a-cc17-pi-2b-multidrug-resistant-sublineage
#3
Elisabete R Martins, Cristiano Pedroso-Roussado, José Melo-Cristino, Mário Ramirez
The molecular characterization of 218 GBS isolates recovered from neonatal invasive infections in Portugal in 2005-2015 revealed the existence of a small number of genetically distinct lineages that were present over a significant time-span. Serotypes III and Ia were dominant in the population, together accounting for >80% of the isolates. Clonal complex 17 included 50% of all isolates, highlighting the importance of the hypervirulent genetic lineage represented by serotype III ST17/rib/PI-1+PI-2b. Serotype Ia was represented mainly by ST23, previously reported as dominant among invasive disease in non-pregnant adults in Portugal, but also by ST24, showing an increased frequency among late-onset disease...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28396132/clostridium-difficile-infection
#4
REVIEW
Luis Alcalá Hernández, Elena Reigadas Ramírez, Emilio Bouza Santiago
Clostridium difficile infection (CDI) is the main cause of nosocomial diarrhea in industrialized countries and the source of a growing number of cases of diarrhea in the community. The outbreak of the hypervirulent strain belonging to ribotype 027 has increased the incidence and severity of CDI in some countries. Although CDI usually courses as a mild diarrhea it can lead to severe forms such as toxic megacolon or septic shock. One of every 2 episodes of CDI is not diagnosed in Spanish hospitals due to a lack of clinical suspicion or the use of insensitive diagnostic methods...
April 8, 2017: Medicina Clínica
https://www.readbyqxmd.com/read/28392922/first-report-of-invasive-liver-abscess-syndrome-with-endophthalmitis-caused-by-a-k2-serotype-st2398-hypervirulent-klebsiella-pneumoniae-in-germany-2016
#5
C Pichler, M Büchsel, J W Rossen, M Vavra, S Reuter, W V Kern, R Thimme, A Mischnik
We report a case of severe infection with liver abscess and endophthalmitis caused by a hypervirulent Klebsiella pneumoniae strain in an immunocompetent German male patient without travel history to Asia. Phenotypic and molecular characterization showed high similarity to the reference genome NTUH-K2044 isolated in Asia. The isolate was assigned as ST2398 (clonal complex 66). The findings underline global spread of hypervirulent Klebsiella pneumoniae strains to Europe.
May 2017: New Microbes and New Infections
https://www.readbyqxmd.com/read/28384318/correction-hypervirulent-mycobacterium-tuberculosis-strain-triggers-necrotic-lung-pathology-associated-with-enhanced-recruitment-of-neutrophils-in-resistant-c57bl-6-mice
#6
Fabrício M Almeida, Thatiana L B Ventura, Eduardo P Amaral, Simone C M Ribeiro, Sanderson D Calixto, Marcelle R Manhães, Andreza L Rezende, Giliane S Souza, Igor S de Carvalho, Elisangela C Silva, Juliana Azevedo da Silva, Eulógio C Q Carvalho, Afranio L Kritski, Elena B Lasunskaia
[This corrects the article DOI: 10.1371/journal.pone.0173715.].
2017: PloS One
https://www.readbyqxmd.com/read/28383686/cluster-of-fatal-group-a-streptococcal-emm87-infection-within-a-single-family-molecular-basis-for-invasion-and-transmission
#7
Anthony R Flores, Ruth Ann Luna, Jessica K Runge, Samuel A Shelburne, Carol J Baker
Hypervirulent disease due to group A Streptococcus (GAS) can result from strains with mutations that enhance virulence gene expression but reduce subsequent transmission. We used whole genome sequencing to investigate intra-familial spread between 4 siblings of a hypervirulent GAS strain resulting in a fatality. All invasive and pharyngeal GAS isolates had an identical mutation in a gene encoding a key regulatory protein that yielded a hyperinvasive phenotype. These data challenge the prevailing theory of reduced transmission induced by mutations that lead to hypervirulent GAS by showing that spread of hypervirulent GAS may lead to clusters of invasive disease...
April 5, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28379411/comparison-of-the-inflammatory-response-of-brain-microvascular-and-peripheral-endothelial-cells-following-infection-with-neisseria-meningitidis
#8
Julia Dick, Sabrina Hebling, Jérôme Becam, Muhamed-Kheir Taha, Alexandra Schubert-Unkmeir
The interaction of Neisseria meningitidis with both peripheral and brain endothelial cells is a critical event in the development of invasive meningococcal disease. In this study, we used in vitro models based on human brain microvascular endothelial cells (HBMEC), and peripheral endothelial EA.hy926 cells, to investigate their roles in the inflammatory response towards meningococcal infection. Both cell lines were infected with two pathogenic N. meningitidis isolates and secretion of the cytokine interleukin-6 (IL-6), the CXC chemokine IL-8 and the monocyte chemoattractant protein-1 (MCP-1) were estimated by ELISA...
April 1, 2017: Pathogens and Disease
https://www.readbyqxmd.com/read/28375514/clinical-implications-of-genomic-adaptation-and-evolution-of-carbapenem-resistant-klebsiella-pneumoniae
#9
Angela Gomez-Simmonds, Anne-Catrin Uhlemann
Klebsiella pneumoniae poses a major challenge to healthcare worldwide as an important cause of multidrug-resistant infections. Nosocomial clones, including epidemic sequence type 258 (ST258), have shown an affinity for acquiring and disseminating resistance plasmids, particularly variants of the K. pneumoniae carbapenemase. By comparison, the resurgence of severe community-associated K. pneumoniae infections has led to increased recognition of hypervirulent strains belonging to the K1 and K2 capsular serotypes, predominantly in eastern Asia...
February 15, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28373547/emergence-of-a-new-neisseria-meningitidis-clonal-complex-11-lineage-11-2-clade-as-an-effective-urogenital-pathogen
#10
Yih-Ling Tzeng, Jose A Bazan, Abigail Norris Turner, Xin Wang, Adam C Retchless, Timothy D Read, Evelyn Toh, David E Nelson, Carlos Del Rio, David S Stephens
Neisseria meningitidis (Nm) clonal complex 11 (cc11) lineage is a hypervirulent pathogen responsible for outbreaks of invasive meningococcal disease, including among men who have sex with men, and is increasingly associated with urogenital infections. Recently, clusters of Nm urethritis have emerged primarily among heterosexual males in the United States. We determined that nonencapsulated meningococcal isolates from an ongoing Nm urethritis outbreak among epidemiologically unrelated men in Columbus, Ohio, are linked to increased Nm urethritis cases in multiple US cities, including Atlanta and Indianapolis, and that they form a unique clade (the US Nm urethritis clade, US_NmUC)...
April 3, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28373351/key-role-of-capsular-polysaccharide-in-the-induction-of-systemic-infection-and-abortion-by-hypervirulent-campylobacter-jejuni
#11
Orhan Sahin, Samantha A Terhorst, Eric R Burrough, Zhangqi Shen, Zuowei Wu, Lei Dai, Yizhi Tang, Paul J Plummer, Ju Ji, Michael J Yaeger, Qijing Zhang
Campylobacter jejuni is a zoonotic pathogen, and a hypervirulent strain, named clone SA, has recently emerged as the predominant cause of ovine abortion in the United States. To induce abortion, orally ingested Campylobacter must translocate across the intestinal epithelium, spread systemically in the circulation, and reach the fetoplacental tissue. Bacterial factors involved in these steps are not well understood. C. jejuni is known to produce capsular polysaccharide (CPS), but the specific role CPS plays in systemic infection and particularly abortion in animals remains to be determined...
April 3, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28366569/development-of-a-dose-assay-for-a-clostridium-difficile-vaccine-using-a-tandem-ion-exchange-high-performance-liquid-chromatography-method
#12
Feng Wang, Sha Ha, Richard R Rustandi
Clostridium difficile is a gram-positive intestine bacterium that causes a severe diarrhea and could eventually be lethal. The main virulence factor is related to the release of two major exotoxins, toxin A (TcdA) and toxin B (TcdB). Recent C. difficile-associated disease (CDAD) outbreaks have been caused by hypervirulent strains which secrete an additional binary toxin (CDTa/CDTb). Vaccination against these toxins is considered the best way to combat the CDAD. Recently, a novel tetravalent C. difficile vaccine candidate containing all four toxins produced from a baculovirus expression system has been developed...
March 21, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28363494/clinical-and-endoscopic-features-in-patients-with-hospital-acquired-diarrhea-associated-with-clostridium-difficile-infection
#13
J A Velarde Ruiz-Velasco, J M Aldana-Ledesma, M A Ibarra-Estrada, S A Aguirre Díaz, J A Fernández-Ramírez, F Cárdenas-Lara, F Álvarez López, L E Rodríguez-Noriega, H R Pérez-Gómez, M R Morfín-Otero
BACKGROUND AND AIMS: Clostridium difficile (CD) is the leading cause of hospital-acquired diarrhea. Clinical and endoscopic findings are poorly described in our country. The aim of this study is to depict those findings. MATERIAL AND METHODS: Prospective cohort study, which included patients with CD associated hospital-acquired diarrhea, diagnosed by means of fecal PCR and testing for the presence of hypervirulent strain NAP027. We analyzed clinical and endoscopic features, as well as the variables associated with severe disease...
March 28, 2017: Revista de Gastroenterología de México
https://www.readbyqxmd.com/read/28358126/corrigendum-uncovering-listeria-monocytogenes-hypervirulence-by-harnessing-its-biodiversity
#14
Mylène M Maury, Yu-Huan Tsai, Caroline Charlier, Marie Touchon, Viviane Chenal-Francisque, Alexandre Leclercq, Alexis Criscuolo, Charlotte Gaultier, Sophie Roussel, Anne Brisabois, Olivier Disson, Eduardo P C Rocha, Sylvain Brisse, Marc Lecuit
No abstract text is available yet for this article.
March 30, 2017: Nature Genetics
https://www.readbyqxmd.com/read/28351920/spxa1-and-spxa2-act-coordinately-to-fine-tune-stress-responses-and-virulence-in-streptococcus-pyogenes
#15
Gary C Port, Zachary T Cusumano, Paul R Tumminello, Michael G Caparon
SpxA is a unique transcriptional regulator highly conserved among members of the phylum Firmicutes that binds RNA polymerase and can act as an antiactivator. Why some Firmicutes members have two highly similar SpxA paralogs is not understood. Here, we show that the SpxA paralogs of the pathogen Streptococcus pyogenes, SpxA1 and SpxA2, act coordinately to regulate virulence by fine-tuning toxin expression and stress resistance. Construction and analysis of mutants revealed that SpxA1(-) mutants were defective for growth under aerobic conditions, while SpxA2(-) mutants had severely attenuated responses to multiple stresses, including thermal and oxidative stresses...
March 28, 2017: MBio
https://www.readbyqxmd.com/read/28348868/the-diversity-of-klebsiella-pneumoniae-surface-polysaccharides
#16
Rainer Follador, Eva Heinz, Kelly L Wyres, Matthew J Ellington, Michael Kowarik, Kathryn E Holt, Nicholas R Thomson
Klebsiella pneumoniae is considered an urgent health concern due to the emergence of multi-drug-resistant strains for which vaccination offers a potential remedy. Vaccines based on surface polysaccharides are highly promising but need to address the high diversity of surface-exposed polysaccharides, synthesized as O-antigens (lipopolysaccharide, LPS) and K-antigens (capsule polysaccharide, CPS), present in K. pneumoniae. We present a comprehensive and clinically relevant study of the diversity of O- and K-antigen biosynthesis gene clusters across a global collection of over 500 K...
August 2016: Microbial Genomics
https://www.readbyqxmd.com/read/28348758/recurrent-sepsis-and-neuroinvasive-disease-in-a-neonate-culture-positive-for-a-group-b-streptococcus-cps-iii-serotype-hvga-strain
#17
Sneha Suresh, Gregory Tyrrell, Areej Alhhazmi, Sandra Escoredo, Michael Hawkes
INTRODUCTION: Late-onset disease with Group B Streptococcus (GBS LOD) remains a significant problem in neonates. Unlike early-onset disease, rates of GBS LOD have not changed with prenatal testing. Effects of GBS LOD can be severe and thus identifying risk factors for severe GBS LOD, such as hypervirulence genes, may help in managing these infants. CASE PRESENTATION: We present a case of a neonate with capsular serotype III GBS sepsis without meningitis that recurred 6 days after a 10-day-treatment period with IV ampicillin...
June 2016: JMM Case Reports
https://www.readbyqxmd.com/read/28339951/characterization-of-a-hypervirulent-fowl-adenovirus-4-with-the-novel-genotype-newly-prevalent-in-china-and-establishment-of-reproduction-infection-model-of-hydropericardium-syndrome-in-chickens
#18
Q Pan, L Liu, Y Gao, C Liu, X Qi, Y Zhang, Y Wang, K Li, L Gao, X Wang, H Cui
Severe hydropericardium syndrome (HPS) has been present in layers in the northeast of China since June 2015, with mortality rates varying from 30 to 90%. Dead layers had severe hydropericardium with pericardial volumes of 5 to 20 mL, as well as inclusion body hepatitis. Laboratory investigations led to the isolation of a fowl adenovirus strain, HLJFAd15, from the liver tissue of dead layers. Natural deletions of ORF19 and ORF27 were found in this clinical strain by complete genome sequencing, which was identified with the novel genotype recently prevalent in China...
March 4, 2017: Poultry Science
https://www.readbyqxmd.com/read/28339856/the-hypervirulent-variant-of-klebsiella-pneumoniae-is-established-in-new-york-city
#19
Andrew Parrott, Jun Shi, Fann Wu
No abstract text is available yet for this article.
March 1, 2017: American Journal of Clinical Pathology
https://www.readbyqxmd.com/read/28323229/draft-genome-of-a-hypervirulent-klebsiella-quasipneumoniae-subsp-similipneumoniae-with-novel-sequence-type-st2320-isolated-from-a-chronic-liver-disease-patient
#20
Chaitra Shankar, Laura E B Nabarro, Dhiviya Prabaa Muthuirulandi Sethuvel, Ayyan Raj, Naveen Kumar Devanga Ragupathi, George Priya Doss, Balaji Veeraraghavan
No abstract text is available yet for this article.
March 18, 2017: Journal of Global Antimicrobial Resistance
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