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neisseria meningitidis

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https://www.readbyqxmd.com/read/28440997/-neisseria-meningitidis-a-clinical-case-with-multi-organ-affection
#1
Alejandro Medina-Reyes, Beatriz Díaz-Polanco, Diego Sandoval-Chávez, Manuel Nodal-Hernández, Juan R Ayala-Franco
Neisseria meningitidis (Nm) is an agent feared for decades in the medical field due to its important morbidity and mortality. Ironically between 10 and 15% of the population will be asymptomatic carriers of this germ, which will also be ready to activate and manifest itself as a sickness at the right moment. We present the case of a nine-year-old girl who arrived at the Pediatric Emergency Service (to the Hospital General Region number 35, in Ciudad Juárez, Chihuahua) with the disease in multiple organs, where the Nm was isolated in the cerebrospinal fluid and in skin injuries, displaying three serotypes of Nm...
May 2017: Revista Médica del Instituto Mexicano del Seguro Social
https://www.readbyqxmd.com/read/28433330/bivalent-rlp2086-trumenba%C3%A2-development-of-a-well-characterized-vaccine-through-commercialization
#2
Khurram Sunasara, John Cundy, Sriram Srinivasan, Brad Evans, Weiqiang Sun, Scott Cook, Eric Bortell, John Farley, Daniel Griffin, Michele Bailey Piatchek, Katherine Arch-Douglas
The phrase "Process is the Product" is often applied to biologics, including multicomponent vaccines composed of complex components that evade complete characterization. Vaccine production processes must be defined and locked early in the development cycle to ensure consistent quality of the vaccine throughout scale-up, clinical studies, and commercialization. This approach of front-loading the development work helped facilitate the accelerated approval of the Biologic License Application for the well-characterized vaccine bivalent rLP2086 (Trumenba®, Pfizer Inc) in 2014 under Breakthrough Therapy Designation...
April 19, 2017: Vaccine
https://www.readbyqxmd.com/read/28431522/comparative-proteomic-analysis-of-neisseria-meningitidis-wildtype-and-dpra-null-mutant-strains-links-dna-processing-to-pilus-biogenesis
#3
Getachew Tesfaye Beyene, Shewit Kalayou, Tahira Riaz, Tone Tonjum
BACKGROUND: DNA processing chain A (DprA) is a DNA binding protein which is ubiquitous in bacteria, and is required for DNA transformation to various extents among bacterial species. However, the interaction of DprA with competence and recombination proteins is poorly understood. Therefore, the proteomes of whole Neisseria meningitidis (Nm) wildtype and dprA mutant cells were compared. Such a comparative proteomic analysis increases our understanding of the interactions of DprA with other Nm components and may elucidate its potential role beyond DNA processing in transformation...
April 21, 2017: BMC Microbiology
https://www.readbyqxmd.com/read/28423169/innate-immune-response-to-lipooligosaccharide-pivotal-regulator-of-the-pathobiology-of-invasive-neisseria-meningitidis-infections
#4
Constance M John, Nancy J Phillips, Daniel C Stein, Gary A Jarvis
Infections due to Neisseria meningitidis afflict more than one million people worldwide annually and cause death or disability in many survivors. The clinical course of invasive infections has been well studied, but our understanding of the cause of differences in patient outcomes has been limited because these are dependent on multiple factors including the response of the host, characteristics of the bacteria and interactions between the host and the bacteria. The meningococcus is a highly inflammatory organism, and the lipooligosaccharide (LOS) on the outer membrane is the most potent inflammatory molecule it expresses due to the interactions of the lipid A moiety of LOS with receptors of the innate immune system...
April 1, 2017: Pathogens and Disease
https://www.readbyqxmd.com/read/28404679/evaluation-of-taqman-array-card-tac-for-the-detection-of-central-nervous-system-infections-in-kenya
#5
Clayton O Onyango, Vladimir Loparev, Shirley Lidechi, Vinod Bhullar, D Scott Schmid, Kay Radford, Michael K Lo, Paul Rota, Barbara W Johnson, Jorge Munoz, Martina Oneko, Deron Burton, Carolyn M Black, John Neatherlin, Joel M Montgomery, Barry Fields
Infections of the central nervous system (CNS) are often acute with significant morbidity and mortality. Routine diagnosis of such infections is limited in developing countries and requires modern equipment in advanced laboratories that may be unavailable to a number of patients in sub-Saharan Africa. We developed a TaqMan Array Card (TAC) that detects multiple pathogens simultaneously from cerebrospinal fluid (CSF). The 21-pathogen TAC assays include two parasites (Balamuthia mandrillaris and Acanthamoeba), six bacterial pathogens (Streptococcus pneumoniae, Haemophilus influenzae, Neisseria meningitidis, Mycoplasma pneumoniae, Mycobacterium tuberculosis, and Bartonella) and 13 viruses (parechovirus, dengue, nipah, varicella zoster, mumps, measles, lyssa, herpes simplex virus 1 and 2, Epstein Barr virus, enterovirus, cytomegalovirus and chikungunya)...
April 12, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28400529/control-of-gdhr-expression-in-neisseria-gonorrhoeae-via-autoregulation-and-a-master-repressor-mtrr-of-a-drug-efflux-pump-operon
#6
Corinne E Rouquette-Loughlin, Yaramah M Zalucki, Vijaya L Dhulipala, Jacqueline T Balthazar, Raúl G Doyle, Robert A Nicholas, Afrin A Begum, Erica L Raterman, Ann E Jerse, William M Shafer
The MtrCDE efflux pump of Neisseria gonorrhoeae contributes to gonococcal resistance to a number of antibiotics used previously or currently in treatment of gonorrhea, as well as to host-derived antimicrobials that participate in innate defense. Overexpression of the MtrCDE efflux pump increases gonococcal survival and fitness during experimental lower genital tract infection of female mice. Transcription of mtrCDE can be repressed by the DNA-binding protein MtrR, which also acts as a global regulator of genes involved in important metabolic, physiologic, or regulatory processes...
April 11, 2017: MBio
https://www.readbyqxmd.com/read/28397477/real-time-pcr-detection-of-the-most-common-bacteria-and-viruses-causing-meningitis
#7
Oya Akkaya, Hulya Iren Guvenc, Serife Yuksekkaya, Aysegul Opus, Asuman Guzelant, Meral Kaya, Muhammet Guzel Kurtoglu, Nurettin Kaya
BACKGROUND: Central nervous system (CNS) infections require prompt diagnosis, as the clinical condition progresses rapidly and may lead to severe permanent sequelae or death. The causative agents include viruses, bacteria, fungi, and parasites. In this study, samples with the diagnosis of CNS infection based on cerebrospinal fluid (CSF) sent to us from other hospitals/labs, were studied by multiplex real-time Polymerase Chain Reaction (PCR) method. The purpose of this study is to demonstrate, retrospectively, the most common bacteria and viruses causing meningitis and seasonal distribution of these agents using the multiplex real-time PCR method in CSF samples...
April 1, 2017: Clinical Laboratory
https://www.readbyqxmd.com/read/28388876/transcriptomic-buffering-of-cryptic-genetic-variation-contributes-to-meningococcal-virulence
#8
Biju Joseph Ampattu, Laura Hagmann, Chunguang Liang, Marcus Dittrich, Andreas Schlüter, Jochen Blom, Elizaveta Krol, Alexander Goesmann, Anke Becker, Thomas Dandekar, Tobias Müller, Christoph Schoen
BACKGROUND: Commensal bacteria like Neisseria meningitidis sometimes cause serious disease. However, genomic comparison of hyperinvasive and apathogenic lineages did not reveal unambiguous hints towards indispensable virulence factors. Here, in a systems biological approach we compared gene expression of the invasive strain MC58 and the carriage strain α522 under different ex vivo conditions mimicking commensal and virulence compartments to assess the strain-specific impact of gene regulation on meningococcal virulence...
April 7, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28384279/host-cell-derived-lactate-functions-as-an-effector-molecule-in-neisseria-meningitidis-microcolony-dispersal
#9
Sara Sigurlásdóttir, Jakob Engman, Olaspers Sara Eriksson, Sunil D Saroj, Nadezda Zguna, Pilar Lloris-Garcerá, Leopold L Ilag, Ann-Beth Jonsson
The development of meningococcal disease, caused by the human pathogen Neisseria meningitidis, is preceded by the colonization of the epithelial layer in the nasopharynx. After initial adhesion to host cells meningococci form aggregates, through pilus-pilus interactions, termed microcolonies from which the bacteria later detach. Dispersal from microcolonies enables access to new colonization sites and facilitates the crossing of the cell barrier; however, this process is poorly understood. In this study, we used live-cell imaging to investigate the process of N...
April 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28382026/interstrain-cooperation-in-meningococcal-biofilms-role-of-autotransporters-nalp-and-auta
#10
Jesús Pérez-Ortega, Antonio Rodríguez, Eduardo Ribes, Jan Tommassen, Jesús Arenas
Neisseria meningitidis (Nm) and Neisseria lactamica (Nl) are commensal bacteria that live in the human nasopharynx, where they form microcolonies. In contrast to Nl, Nm occasionally causes blood and/or meningitis infection with often fatal consequences. Here, we studied interactions between neisserial strains during biofilm formation. Fluorescent strains were engineered and analyzed for growth in single- and dual-strain biofilms with confocal laser-scanning microscopy. Different strains of diverse Neisseria species formed microcolonies of different sizes and morphologies...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28379411/comparison-of-the-inflammatory-response-of-brain-microvascular-and-peripheral-endothelial-cells-following-infection-with-neisseria-meningitidis
#11
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/28375029/emerging-experience-with-meningococcal-serogroup-b-protein-vaccines
#12
REVIEW
Daniela Toneatto, Mariagrazia Pizza, Vega Masignani, Rino Rappuoli
The successful development of two broadly protective vaccines targeting Neisseria meningitidis serogroup B (MenB); 4CMenB and rLP2086, is the most significant recent advance in meningococcal disease prevention. Areas covered: Here we review the principles underlying the development of each vaccine and the novel methods used to estimate vaccine coverage. We update clinical and post-licensure experience with 4CMenB and rLP2086. Expert commentary: The immunogenicity and acceptable safety profile of 4CMenB and rLP2086 has been demonstrated in clinical trials...
May 2017: Expert Review of Vaccines
https://www.readbyqxmd.com/read/28374598/-the-possibilities-for-the-implementation-of-whole-genome-sequencing-wgs-of-neisseria-meningitidis-in-molecular-surveillance-of-invasive-meningococcal-disease-in-the-czech-republic
#13
Z Vacková, P Křížová, Z Jandová, M Musílek, J Kozáková
The implementation of the surveillance of invasive meningococcal disease is recommended worldwide. The Whole Genome Sequencing (WGS) method increasingly comes to the fore, which provides the possibilities for further detailed characterization of Neisseria meningitidis and makes it possible to integrate all conventional sequencing approaches into one method. Six N. meningitidis isolates from 2013 and 2015, characterized previously by Sanger amplicon sequencing, were selected to be studied by the novel WGS method...
2017: Epidemiologie, Mikrobiologie, Imunologie
https://www.readbyqxmd.com/read/28373547/emergence-of-a-new-neisseria-meningitidis-clonal-complex-11-lineage-11-2-clade-as-an-effective-urogenital-pathogen
#14
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/28369428/novel-approaches-to-neisseria-meningitidis-vaccine-design
#15
Myron Christodoulides, John Heckels
A range of vaccines is available for preventing life-threatening diseases caused by infection with Neisseria meningitidis (meningococcus, Men). Capsule polysaccharide (CPS)-conjugate vaccines are successful prophylactics for serogroup MenA, MenC, MenW and MenY infections and outer membrane vesicle (OMV) vaccines have been used successfully for controlling clonal serogroup MenB infections. MenB vaccines based on recombinant proteins identified by reverse vaccinology (Bexsero®) and proteomics (Trumenba®) approaches have recently been licensed and Bexsero® has been introduced into the UK infant immunization program...
March 22, 2017: Pathogens and Disease
https://www.readbyqxmd.com/read/28369241/neisseria-models-of-infection-and-persistence-in-the-upper-respiratory-tract
#16
Nathan J Weyand
The Gram-negative bacteria genus Neisseria includes both pathogenic and commensal species that are found primarily in the upper respiratory tract of humans and animals. The development of animal models to study neisserial pathogenesis has focused almost exclusively on two species that cause disease in humans. These include Neisseria meningitidis, an obligate commensal that can cause invasive disease, and N. gonorrhoeae, the causative agent of gonorrhea. Both pathogens can persist in the upper respiratory tract...
April 1, 2017: Pathogens and Disease
https://www.readbyqxmd.com/read/28368526/licensed-meningococcal-serogroup-b-vaccine-induced-immunity-against-invasive-disease-does-not-reflect-protection-against-nasal-colonization-in-a-humanized-mouse-model
#17
Carolyn M Buckwalter, Elissa G Currie, Raymond S W Tsang, Scott D Gray-Owen
Background: The 4CMenB vaccine is an outer membrane vesicle and recombinant protein-based vaccine recently licensed to protect against serogroup B meningococcal disease. It remains unknown whether this vaccine will prevent carriage or transmission, key aspects in long-term vaccine success and disease eradication. Methods: Employing a 'humanized' transgenic mouse model of nasal colonization, a systematic approach was taken to estimate the potential for carriage prevention against antigenically-diverse Neisseria meningitidis strains, and to compare this protection to an invasive meningococcal disease challenge model...
March 27, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28368462/strains-responsible-for-invasive-meningococcal-disease-in-patients-with-terminal-complement-pathway-deficiencies
#18
Jérémie Rosain, Eva Hong, Claire Fieschi, Paula Vieira Martins, Carine El Sissy, Ala-Eddine Deghmane, Marie Ouachée, Caroline Thomas, David Launay, Loïc de Pontual, Felipe Suarez, Despina Moshous, Capucine Picard, Muhamed-Kheir Taha, Véronique Frémeaux-Bacchi
Background.: Patients with terminal complement pathway deficiencies (TPD) are susceptible to recurrent invasive meningococcal disease (IMD). Neisseria meningitidis (Nm) strains infecting these patients are poorly documented in the literature. Methods.: We identified patients with TPD and available Nm strains isolated during IMD. We investigated the genetic basis of the different TPD and the characteristics of the Nm strains. Results.: We included n=56 patients with C5 (n=8), C6 (n=20), C7 (n=18), C8 (n=9) or C9 (n=1) deficiency...
March 25, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28359219/modification-of-sample-processing-for-the-limulus-amebocyte-lysate-assay-enhances-detection-of-inflammogenic-endotoxin-in-intact-bacteria-and-organic-dust
#19
Kimberly A Hoppe Parr, Suzana Hađina, Brita Kilburg-Basnyat, Yifang Wang, Dulce Chavez, Peter S Thorne, Jerrold P Weiss
The pro-inflammatory potency and causal relationship with asthma of inhaled endotoxins have underscored the importance of accurately assessing the endotoxin content of organic dusts. The Limulus amebocyte lysate (LAL) assay has emerged as the preferred assay, but its ability to measure endotoxin in intact bacteria and organic dusts with similar sensitivity as purified endotoxin is unknown. We used metabolically radiolabeled Neisseria meningitidis and both rough and smooth Escherichia coli to compare dose-dependent activation in the LAL with purified endotoxin from these bacteria and shed outer membrane (OM) blebs...
April 2017: Innate Immunity
https://www.readbyqxmd.com/read/28352634/surveillance-of-australian-hajj-pilgrims-for-carriage-of-potentially-pathogenic-bacteria-data-from-two-pilot-studies
#20
Mohammad Irfan Azeem, Mohamed Tashani, Al-Mamoon Badahdah, Leon Heron, Kristen Pedersen, Neisha Jeoffreys, Jen Kok, Elizabeth Haworth, Dominic E Dwyer, Grant Hill-Cawthorne, Harunor Rashid, Robert Booy
AIM: To estimate the pharyngeal carriage rate of Neisseria meningitidis (N. meningitidis), Streptococcus pneumoniae (S. pneumoniae) and Staphylococcus aureus (S. aureus) among Australian Hajj pilgrims. METHODS: In 2014, surveillance was conducted in two phases among Australian Hajj pilgrims: The first phase during Hajj in Mina, and the second phase soon after returning home to Australia. Nasopharyngeal or oropharyngeal swabs were taken from participants then tested, firstly by nucleic acid testing, and also by standard culture...
March 16, 2017: World Journal of Clinical Cases
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