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neisseria meningitidis

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https://www.readbyqxmd.com/read/28098538/neisseria-meningitidis-st11-complex-isolates-associated-with-nongonococcal-urethritis-indiana-usa-2015-2016
#1
Evelyn Toh, Dharanesh Gangaiah, Byron E Batteiger, James A Williams, Janet N Arno, Albert Tai, Teresa A Batteiger, David E Nelson
At a clinic in Indianapolis, Indiana, USA, we observed an increase in Neisseria gonorrhoeae-negative men with suspected gonococcal urethritis who had urethral cultures positive for N. meningitidis. We describe genomes of 2 of these N. meningitidis sequence type 11 complex urethritis isolates. Clinical evidence suggests these isolates may represent an emerging urethrotropic clade.
February 2017: Emerging Infectious Diseases
https://www.readbyqxmd.com/read/28090076/a-journey-into-the-brain-insight-into-how-bacterial-pathogens-cross-blood-brain-barriers
#2
Mathieu Coureuil, Hervé Lécuyer, Sandrine Bourdoulous, Xavier Nassif
The blood-brain barrier, which is one of the tightest barriers in the body, protects the brain from insults, such as infections. Indeed, only a few of the numerous blood-borne bacteria can cross the blood-brain barrier to cause meningitis. In this Review, we focus on invasive extracellular pathogens, such as Neisseria meningitidis, Streptococcus pneumoniae, group B Streptococcus and Escherichia coli, to review the obstacles that bacteria have to overcome in order to invade the meninges from the bloodstream, and the specific skills they have developed to bypass the blood-brain barrier...
January 16, 2017: Nature Reviews. Microbiology
https://www.readbyqxmd.com/read/28081260/comparative-genome-sequencing-reveals-within-host-genetic-changes-in-neisseria-meningitidis-during-invasive-disease
#3
Johanna Klughammer, Marcus Dittrich, Jochen Blom, Vera Mitesser, Ulrich Vogel, Matthias Frosch, Alexander Goesmann, Tobias Müller, Christoph Schoen
Some members of the physiological human microbiome occasionally cause life-threatening disease even in immunocompetent individuals. A prime example of such a commensal pathogen is Neisseria meningitidis, which normally resides in the human nasopharynx but is also a leading cause of sepsis and epidemic meningitis. Using N. meningitidis as model organism, we tested the hypothesis that virulence of commensal pathogens is a consequence of within host evolution and selection of invasive variants due to mutations at contingency genes, a mechanism called phase variation...
2017: PloS One
https://www.readbyqxmd.com/read/28080049/modeling-diversity-in-structures-of-bacterial-outer-membrane-lipids
#4
Huilin Ma, Daniel D Cummins, Natalie Brooke Edelstein, Jerry Gomez, Aliza Khan, Masud Dikita Llewellyn, Tara Picudella, Sarah Rose Willsey, Shikha Nangia
Lipopolysaccharides are vital components of the outer membrane of gram-negative bacteria, and they act as extremely strong stimulators of innate immunity in diverse eukaryotic species. The primary immunostimulatory center of the LPS molecule is lipid A-a disaccharide-bound lipophilic domain. Considering the broad diversity in bacterial species, there are variations in the lipid A structure and their immunogenic potency. In this work, we model the lipid A structures of eight commensal or human pathogenic bacterial species: Helicobacter pylori, Porphyromonas gingivalis, Bacteroides fragilis, Bordetella pertussis, Chlamydia trachomatis, Campylobacter jejuni, Neisseria meningitidis, and Salmonella minnesota...
January 12, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28077083/evaluation-of-the-line-probe-assay-for-the-rapid-detection-of-bacterial-meningitis-pathogens-in-cerebrospinal-fluid-samples-from-children
#5
Ahmet Soysal, Demet Gedikbasi Toprak, Salih Türkoğlu, Mustafa Bakir
BACKGROUND: The aim of this study is to compare the diagnostic performance of the line probe assay (LPA) with conventional multiplex polymerase chain reaction (PCR) for Streptococcus pneumoniae as well as real-time PCR for Neisseria meningitidis and Haemophilus influenzae type b (Hib) in cerebrospinal fluid (CSF) samples from children during the multicenter national surveillance of bacterial meningitis between the years 2006 and 2009 in Turkey. RESULTS: During the study period 1460 subjects were enrolled and among them 841 (57%) met the criteria for probable bacterial meningitis...
January 11, 2017: BMC Microbiology
https://www.readbyqxmd.com/read/28069958/properdin-binding-to-complement-activating-surfaces-depends-on-initial-c3b-deposition
#6
Morten Harboe, Christina Johnson, Stig Nymo, Karin Ekholt, Camilla Schjalm, Julie K Lindstad, Anne Pharo, Bernt Christian Hellerud, Kristina Nilsson Ekdahl, Tom Eirik Mollnes, Per H Nilsson
Two functions have been assigned to properdin; stabilization of the alternative convertase, C3bBb, is well accepted, whereas the role of properdin as pattern recognition molecule is controversial. The presence of nonphysiological aggregates in purified properdin preparations and experimental models that do not allow discrimination between the initial binding of properdin and binding secondary to C3b deposition is a critical factor contributing to this controversy. In previous work, by inhibiting C3, we showed that properdin binding to zymosan and Escherichia coli is not a primary event, but rather is solely dependent on initial C3 deposition...
January 9, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28065808/bacterial-meningitis-in-alcoholic-patients-a-population-based-prospective-study
#7
Kiril E B van Veen, Matthijs C Brouwer, Arie van der Ende, Diederik van de Beek
OBJECTIVES: To study clinical features and outcome of community-acquired bacterial meningitis in alcoholic patients. METHODS: Patients with a history of alcoholism were selected from our nationwide, prospective cohort on community-acquired bacterial meningitis performed from March 2006 to October 2014. Data on patient history, symptoms and signs on admission, treatment, and outcome were prospectively collected. RESULTS: Of 1359 included episodes, 88 episodes (6%) occurred in 88 alcoholic patients...
January 5, 2017: Journal of Infection
https://www.readbyqxmd.com/read/28063198/functional-and-structural-studies-on-the-neisseria-gonorrhoeae-gmha-the-first-enzyme-in-the-glycero-manno-heptose-biosynthesis-pathways-demonstrate-a-critical-role-in-lipooligosaccharide-synthesis-and-gonococcal-viability
#8
Igor H Wierzbicki, Ryszard A Zielke, Konstantin V Korotkov, Aleksandra E Sikora
Sedoheptulose-7-phosphate isomerase, GmhA, is the first enzyme in the biosynthesis of nucleotide-activated-glycero-manno-heptoses and an attractive, yet underexploited, target for development of broad-spectrum antibiotics. We demonstrated that GmhA homologs in Neisseria gonorrhoeae and N. meningitidis (hereafter called GmhAGC and GmhANM , respectively) were interchangeable proteins essential for lipooligosaccharide (LOS) synthesis, and their depletion had adverse effects on neisserial viability. In contrast, the Escherichia coli ortholog failed to complement GmhAGC depletion...
January 7, 2017: MicrobiologyOpen
https://www.readbyqxmd.com/read/28057112/-analysis-for-protection-rate-and-antibody-levels-of-epidemic-cerebrospinal-meningitis-among-children-aged-between-3-23-months-in-liuzhou-in-2012
#9
X L Cui, X Wu, M Q Li
Objective: To understand the level of bactericidal antibodies against Neisseria meningitidis and their rate of protection in children aged between 3 and 23 months, in Liuzhou, in 2012. Methods: Convenience sampling was performed in Liujiang, Rong'an and Sanjiang Counties from May through August, 2012. The inclusion criteria for 603 subjects were: Children aged between 3 and 23 months; no history of meningococcal meningitis; no vaccination against Neisseria meningitidis serogroup C; more than 30 days from the last vaccination against Neisseria meningitidis serogroup A...
December 6, 2016: Zhonghua Yu Fang Yi Xue za Zhi [Chinese Journal of Preventive Medicine]
https://www.readbyqxmd.com/read/28045593/synthesis-and-antibacterial-activity-of-5-tetrachlorophthalimido-and-5-azido-5-deoxyribonucleosides
#10
Robert Van Ostrand, Casey Jacobsen, Alicia Delahunty, Carley Stringer, Ryan Noorbehesht, Haidi Ahmed, Ahmed M Awad
Reported is an efficient synthesis of adenyl and uridyl 5'-tetrachlorophthalimido-5'-deoxyribonucleosides, and guanylyl 5'-azido-5'-deoxyribonucleosides, which are useful in solid-phase synthesis of phosphoramidate and ribonucleic guanidine oligonucleotides. Replacement of 5'-hydroxyl with tetrachlorophthalimido group was performed via Mitsunobu reaction for adenosine and uridine. An alternative method was applied for guanosine which replaced the 5'-hydroxyl with an azido group. The resulting compounds were converted to 5'-amino-5'-deoxyribonucleosides for oligonucleotide synthesis...
January 3, 2017: Nucleosides, Nucleotides & Nucleic Acids
https://www.readbyqxmd.com/read/28039983/parameter-and-state-estimation-in-a-neisseria-meningitidis-model-a-study-case-of-niger
#11
S Bowong, L Mountaga, A Bah, J J Tewa, J Kurths
Neisseria meningitidis (Nm) is a major cause of bacterial meningitidis outbreaks in Africa and the Middle East. The availability of yearly reported meningitis cases in the African meningitis belt offers the opportunity to analyze the transmission dynamics and the impact of control strategies. In this paper, we propose a method for the estimation of state variables that are not accessible to measurements and an unknown parameter in a Nm model. We suppose that the yearly number of Nm induced mortality and the total population are known inputs, which can be obtained from data, and the yearly number of new Nm cases is the model output...
December 2016: Chaos
https://www.readbyqxmd.com/read/28036315/evaluation-of-the-immunogenic-property-of-nt-h-influenzae-protein-d-with-neisseria-meningitidis-omv-in-balb-c
#12
Ava Behrouzi, Saeid Bouzari, Seyed Davar Siadat, Mana Oloomi, Mehdi Davari, Hoora Mazaheri
INTRODUCTION: Identifying ideal non typeable Haemophilus influenzae (NTHi) vaccine candidates has not been easy due to extensive sequence and antigenic variation among gene products interacting with the immune system. Protein D (PD) is a highly conserved 42 kDa surface lipoprotein available in all H. influenzae, including NTHi. METHODOLOGY: In this study, the gene encoding PD was cloned from H. influenzae and expressed in Escheriachia coli TOPO10 cell in pBAD vector...
December 30, 2016: Journal of Infection in Developing Countries
https://www.readbyqxmd.com/read/28035545/dtap5-hb-ipv-hib-vaccine-vaxelis-%C3%A2-a-review-of-its-use-in-primary-and-booster-vaccination
#13
Yahiya Y Syed
Vaxelis(®) is a fully liquid, ready-to-use, hexavalent vaccine approved in the EU for primary and booster vaccination in infants and toddlers from the age of 6 weeks against diphtheria, tetanus, pertussis, hepatitis B, poliomyelitis, and invasive diseases caused by Haemophilus influenzae type b (Hib). It contains diphtheria and tetanus toxoids, five acellular pertussis antigens, recombinant hepatitis B virus surface antigen produced in the yeast, Saccharomyces cerevisiae, inactivated poliovirus, and the Hib polysaccharide (polyribosylribitol phosphate) conjugated to the outer membrane protein complex of Neisseria meningitidis...
December 29, 2016: Paediatric Drugs
https://www.readbyqxmd.com/read/28024455/the-neisseria-meningitidis-lpxl1-mutant-induces-less-tissue-factor-expression-and-activity-in-primary-human-monocytes-and-monocyte-derived-microvesicles-than-the-wild-type-meningococcus
#14
Marit Hellum, Anne-Marie S Trøseid, Jens P Berg, Petter Brandtzaeg, Reidun Øvstebø, Carola E Henriksson
Neisseria meningitidis (N. meningitidis) may cause sepsis and meningitis. N. meningitidis with a mutated lpxL1 gene has five, instead of six, acyl chains in the lipid A moiety. Compared with patients infected with the wild type (wt) meningococcus, patients infected with the lpxL1 mutant have a mild meningococcal disease with less systemic inflammation and less coagulopathy. Circulating tissue factor (TF), the main initiator of coagulation, has a central role in the development of coagulation disturbances during sepsis...
January 1, 2016: Innate Immunity
https://www.readbyqxmd.com/read/28009001/real-time-qpcr-improves-meningitis-pathogen-detection-in-invasive-bacterial-vaccine-preventable-disease-surveillance-in-fiji
#15
Eileen M Dunne, Silivia Mantanitobua, Shalini P Singh, Rita Reyburn, Evelyn Tuivaga, Eric Rafai, Lisi Tikoduadua, Barbara Porter, Catherine Satzke, Janet E Strachan, Kimberly K Fox, Kylie M Jenkins, Adam Jenney, Silo Baro, E Kim Mulholland, Mike Kama, Fiona M Russell
As part of the World Health Organization Invasive Bacterial-Vaccine Preventable Diseases (IB-VPD) surveillance in Suva, Fiji, cerebrospinal fluid (CSF) samples from suspected meningitis patients of all ages were examined by traditional methods (culture, Gram stain, and latex agglutination for bacterial antigen) and qPCR for Streptococcus pneumoniae, Neisseria meningitidis, and Haemophilus influenzae. Of 266 samples tested, pathogens were identified in 47 (17.7%). S. pneumoniae was the most common pathogen detected (n = 17) followed by N...
December 23, 2016: Scientific Reports
https://www.readbyqxmd.com/read/28008331/a-meningococcal-outer-membrane-vesicle-vaccine-incorporating-genetically-attenuated-endotoxin-dissociates-inflammation-from-immunogenicity
#16
David J Dowling, Holly Sanders, Wing Ki Cheng, Sweta Joshi, Spencer Brightman, Ilana Bergelson, Carlo Pietrasanta, Simon D van Haren, Sandra van Amsterdam, Jeffrey Fernandez, Germie P J M van den Dobbelsteen, Ofer Levy
BACKGROUND: Group B Neisseria meningitidis, an endotoxin-producing Gram-negative bacterium, causes the highest incidence of group B meningococcus (MenB) disease in the first year of life. The Bexsero vaccine is indicated in Europe from 8 weeks of age. Endotoxin components of outer membrane vesicles (OMVs) or soluble lipopolysaccharide (LPS) represent a potential source of inflammation and residual reactogenicity. The purpose of this study was to compare novel candidate MenB vaccine formulations with licensed vaccines, including Bexsero, using age-specific human in vitro culture systems...
2016: Frontiers in Immunology
https://www.readbyqxmd.com/read/27998301/acute-polyarthritis-in-a-young-patient-caused-by-meningococcal-and-parvovirus-b19-infections-a-case-report-and-review-of-the-literature
#17
Virginie Lavoipierre, Anna Dellyes, Camille Aubry, Christine Zandotti, Pierre Lafforgue, Philippe Parola, Jean-Christophe Lagier
BACKGROUND: Meningococcal infection is a multifaceted disease including acute polyarthritis. This presentation should be known by clinicians in order to prevent delay in treatment. We report what we believe to be the first case of an association of parvovirus B19 and meningococcal polyarthritis in a young adult. CASE PRESENTATION: A 19-year-old Caucasian woman presented to our hospital with fever, intense leg pain, and a transient rash. A physical examination showed asymmetric polyarthritis and no neurological abnormalities...
December 20, 2016: Journal of Medical Case Reports
https://www.readbyqxmd.com/read/27984730/naturally-occurring-off-switches-for-crispr-cas9
#18
April Pawluk, Nadia Amrani, Yan Zhang, Bianca Garcia, Yurima Hidalgo-Reyes, Jooyoung Lee, Alireza Edraki, Megha Shah, Erik J Sontheimer, Karen L Maxwell, Alan R Davidson
CRISPR-Cas9 technology would be enhanced by the ability to inhibit Cas9 function spatially, temporally, or conditionally. Previously, we discovered small proteins encoded by bacteriophages that inhibit the CRISPR-Cas systems of their host bacteria. These "anti-CRISPRs" were specific to type I CRISPR-Cas systems that do not employ the Cas9 protein. We posited that nature would also yield Cas9 inhibitors in response to the evolutionary arms race between bacteriophages and their hosts. Here, we report the discovery of three distinct families of anti-CRISPRs that specifically inhibit the CRISPR-Cas9 system of Neisseria meningitidis...
December 15, 2016: Cell
https://www.readbyqxmd.com/read/27960595/meningococcal-serogroup-b-vaccines-estimating-breadth-of-coverage
#19
Robert G K Donald, Julio Cesar Hawkins, Li Hao, Paul Liberator, Thomas R Jones, Shannon L Harris, John L Perez, Joseph J Eiden, Kathrin U Jansen, Annaliesa S Anderson
Neisseria meningitidis serogroup B (MenB) is an important cause of invasive meningococcal disease. The development of safe and effective vaccines with activity across the diversity of MenB strains has been challenging. While capsular polysaccharide conjugate vaccines have been highly successful in the prevention of disease due to meningococcal serogroups A, C, W, and Y, this approach has not been possible for MenB owing to the poor immunogenicity of the MenB capsular polysaccharide. Vaccines based on outer membrane vesicles have been successful in the prevention of invasive MenB disease caused by the single epidemic strain from which they were derived, but they do not confer broad protection against diverse MenB strains...
December 14, 2016: Human Vaccines & Immunotherapeutics
https://www.readbyqxmd.com/read/27940178/resurgence-of-neisseria-meningitidis-serogroup-w-st-11-cc11-in-madagascar-2015-2016
#20
Saïda Rasoanandrasana, Mihaja Raberahona, Milen Milenkov, Mbolanirina Lala Rakotomahefa Narison, Felana Ranaivo Rabetokotany, Luc Rakotovao, Mamy Jean de Dieu Randria, Eva Hong, Glaucia Paranhos-Baccalà, Muhamed-Kheir Taha, Mala Rakoto-Andrianarivelo
The resurgence of invasive meningococcal disease caused by Neisseria meningitidis serogroup W with sequence type ST-11 (cc11) was observed in Madagascar in 2015-2016. Three cases were investigated in this study. Molecular characterization of the strains suggests the local transmission of a single genotype that may have been circulating for years.
December 9, 2016: International Journal of Infectious Diseases: IJID
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