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https://www.readbyqxmd.com/read/28741392/recent-advances-in-the-development-and-use-of-molecular-tests-to-predict-antimicrobial-resistance-in-neisseria-gonorrhoeae
#1
Valentina Donà, Nicola Low, Daniel Golparian, Magnus Unemo
The number of genetic tests, mostly real-time PCRs, to detect antimicrobial resistance (AMR) determinants and predict AMR in Neisseria gonorrhoeae is increasing. Several of these assays are promising, but there are important shortcomings and few assays have been adequately validated and quality assured. Areas covered: Recent advances, focusing on publications since 2012, in the development and use of molecular tests to predict gonococcal AMR for surveillance and for clinical use, advantages and disadvantages of these tests and of molecular AMR prediction compared with phenotypic AMR testing, and future perspectives for effective use of molecular AMR tests for different purposes...
July 25, 2017: Expert Review of Molecular Diagnostics
https://www.readbyqxmd.com/read/28740374/characterization-of-throat-microbial-flora-in-smokers-with-or-without-copd
#2
Wenqi Diao, Ning Shen, Yipeng Du, Ke Qian, Bei He
The study aimed to determine the relationship between throat microbiome and COPD. Sixty-five Chinese males (n=20, smokers without COPD; n=45 smokers with COPD) were included. Nonmetric multidimensional scaling indicated differences of microbiome between COPD and controls, but no difference was observed between COPD patients with differing degrees of lung function or disease severity. Rarefaction analyses suggested that operational taxonomic units (OTUs, species-level) richness decreased in COPD. The dominant taxa between COPD and controls were similar, but the proportions of taxonomic distribution were different...
2017: International Journal of Chronic Obstructive Pulmonary Disease
https://www.readbyqxmd.com/read/28739825/neisseria-cinerea-expresses-a-functional-factor-h-binding-protein-which-is-recognised-by-immune-responses-elicited-by-meningococcal-vaccines
#3
Hayley Lavender, Katy Poncin, Christoph M Tang
Neisseria meningitidis is a major cause of bacterial meningitis and sepsis worldwide. Capsular polysaccharide vaccines are available against meningococcal serogroups A, C, W and Y. More recently two protein based vaccines, Bexsero® and Trumenba®, have been licenced against meningococcal serogroup B strains; both vaccines contain meningococcal factor H binding protein (fHbp). fHbp is a surface exposed lipoprotein which binds the negative complement regulator, complement factor H (CFH), thereby inhibiting the alternative pathway of complement activation...
July 24, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28739676/shape-analysis-of-the-htra-rna-thermometer-from-salmonella-enterica
#4
Edric K Choi, Kelsey A Ulanowicz, Yen Anh H Nguyen, Jane K Frandsen, Rachel M Mitton-Fry
RNA thermometers regulate expression of prokaryotic genes involved in heat shock response or in virulence of pathogenic bacteria such as Yersinia, Neisseria, and Salmonella They function through temperature-dependent conformational changes in the mRNAs in which they reside. Most RNA thermometers are found in the 5'-untranslated region (UTR) of the mRNA, where they modulate availability of the ribosome-binding site. We have used SHAPE (Selective 2'-Hydroxyl Acylation analyzed by Primer Extension) assays to systematically characterize the structure and dynamics of the htrA thermometer of Salmonella enterica at single-nucleotide resolution...
July 24, 2017: RNA
https://www.readbyqxmd.com/read/28737877/-neisseria-gonorrhoeae-an-infrequent-causal-agent-of-periorbital-cellulitis-in-a-child
#5
Rocío Del P Pereira-Ospina, Javier Y Pinzón-Salamanca, José M Suescún-Vargas, Yuli Guzmán-Prado
Periorbital cellulitis is a very common disease in pediatric population, it describes an infection involving the adjacent soft tissues anterior to the orbital septum. Pathogens involved are generally Gram-positive cocci after introduction of Haemophilus influenzae vaccine. We report a case of Neisseria gonorrhoeae periorbital cellulitis associated with bacterial conjunctivitis in a child. There are few cases reported in the literature with this microorganism as the causal agent. With this case, we would like to emphasize the importance to do a culture of the ocular secretion (if it exists) because this allowed us to determine an infrequent agent of this disease...
August 1, 2017: Archivos Argentinos de Pediatría
https://www.readbyqxmd.com/read/28732882/engineering-of-anp-efficient-mutant-of-neisseria-polysaccharea-amylosucrase-for-the-synthesis-of-controlled-size-maltooligosaccharides
#6
Alizée Vergès, Sophie Barbe, Emmanuelle Cambon, Claire Moulis, Samuel Tranier, Magali Remaud-Siméon, Isabelle André
Amylosucrase from Neisseria polysaccharea naturally catalyzes the synthesis of α-1,4 glucans from sucrose. The product profile is quite polydisperse, ranging from soluble chains called maltooligosaccharides to high-molecular weight insoluble amylose. This enzyme was recently subjected to engineering of its active site to enable recognition of non-natural acceptor substrates. Libraries of variants were constructed and screened on sucrose, allowing the identification of a mutant that showed a 6-fold enhanced activity toward sucrose compared to the wild-type enzyme...
October 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28729124/trends-in-antimicrobial-resistance-in-neisseria-gonorrhoeae-and-molecular-characteristics-of-neisseria-gonorrhoeae-with-decreased-susceptibility-to-ceftriaxone-in-shandong-china-2007-to-2014
#7
Lihong Zhao, Aihua Liu, Ruiying Li, Shuping Zhao
In this study, the trends of AMR in N. gonorrhoeae were analyzed in Shandong Province of China during 2007-2014. Moreover, the ceftriaxone genetic resistance determinants including penA, mtrR, penB, ponA, and pilQ genes were sequenced, and the molecular mechanisms of decreased susceptibility or resistance to ceftriaxone in N. gonorrhoeae were elucidated. Overall, the increasing trends of resistance to PEN, TET, and CIP, and decreasing trends of susceptibility to CRO and AZM were observed in Shandong Province of China between 2007 and 2014...
July 17, 2017: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/28728477/increased-rate-of-penicillin-non-susceptible-strains-of-n-meningitidis-in-naples-italy
#8
Giovanni Di Caprio, Novella Carannante, Mariano Bernardo, Susanna Cuccurullo, Carlo Pallotto, Carlo Tascini
Neisseria meningitidis is a causative agent of community-acquired sepsis and meningitis in humans. These diseases are associated with high mortality and morbidity if treatment is not started promptly. The empiric antibiotic treatment depends on patient factors and local epidemiology. In the past years, an increased number meningococcal strain with reduced susceptibility to penicillin has also been described. We analysed the susceptibility pattern of 11 N. meningitidis strains isolated between 2013 and 2016...
July 20, 2017: Journal of Chemotherapy
https://www.readbyqxmd.com/read/28723967/epitope-determination-of-immunogenic-proteins-of-neisseria-gonorrhoeae
#9
Daniel O Connor, Lena Danckert, Sebastian Hoppe, Frank F Bier, Markus von Nickisch-Rosenegk
Neisseria gonorrhoeae is the causative organism of gonorrhoea, a sexually transmitted disease that globally accounts for an estimated 80 to 100 million new infections per year. Increasing resistances to all common antibiotics used for N. gonorrhoeae treatment pose the risk of an untreatable disease. Further knowledge of ways of infection and host immune response are needed to understand the pathogen-host interaction and to discover new treatment alternatives against this disease. Therefore, detailed information about immunogenic proteins and their properties like epitope sites could advance further research in this area...
2017: PloS One
https://www.readbyqxmd.com/read/28723791/arthritis-secondary-to-meningococcal-disease-a-case-series-of-7-patients
#10
Vanina Masson-Behar, Hervé Jacquier, Pascal Richette, Jean-Marc Ziza, Valérie Zeller, Christophe Rioux, Baptiste Coustet, Philippe Dieudé, Sébastien Ottaviani
Arthritis secondary to invasive meningococcemia is rare and has been described as a direct result of bacteremia or as immunoallergic-type arthritis, related to the immune complex. Only a few case series have been reported.This multicenter study aimed to describe the clinical characteristics and therapeutic outcomes of arthritis secondary to meningococcal infection.We performed a 5-year retrospective study. We included all patients with inflammatory joint symptoms and proven meningococcal disease defined by the identification of Neisseria meningitidis in blood, cerebrospinal fluid, or synovial fluid...
July 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28723470/sexually-transmitted-disease-and-male-infertility-a-systematic-review
#11
REVIEW
Mikkel Fode, Ferdinando Fusco, Larry Lipshultz, Wolfgang Weidner
CONTEXT: Theoretically, sexually transmitted diseases (STDs) have the potential to disrupt male fertility; however, the topic remains controversial. OBJECTIVE: To describe the possible association between STDs and male infertility and to explore possible pathophysiologic mechanisms. EVIDENCE ACQUISITION: We performed a systematic literature review in accordance with the PRISMA guidelines. PubMed, Embase, and the Cochrane Library were searched for articles published before January 1, 2016, using the MeSH terms for a variety of STDs and infertility...
October 2016: European Urology Focus
https://www.readbyqxmd.com/read/28721112/current-perspectives-in-the-usa-on-the-diagnosis-and-treatment-of-pelvic-inflammatory-disease-in-adolescents
#12
REVIEW
William L Risser, Jan M Risser, Amanda L Risser
In this review, the epidemiology, diagnosis, and treatment of pelvic inflammatory disease (PID) are discussed from a USA perspective and the difficulties that USA adolescents face in recognizing and seeking care for PID and other sexually transmitted infections (STIs) are emphasized. Females aged 15-24 years have the highest incidence of cervical infection with Chlamydia trachomatis and Neisseria gonorrheae, the principal causes of PID. PID is common in this age group. However, the incidence of PID in the USA is not known, because it is not a reportable disease, and because clinicians vary in the criteria used for the diagnosis...
2017: Adolescent Health, Medicine and Therapeutics
https://www.readbyqxmd.com/read/28720847/the-glycointeractome-of-serogroup-b-neisseria-meningitidis-strain-mc58
#13
Tsitsi D Mubaiwa, Lauren E Hartley-Tassell, Evgeny A Semchenko, Freda E-C Jen, Yogitha N Srikhanta, Christopher J Day, Michael P Jennings, Kate L Seib
Neisseria meningitidis express numerous virulence factors that enable it to interact with diverse microenvironments within the host, during both asymptomatic nasopharyngeal colonization and invasive disease. Many of these interactions involve bacterial or host glycans. In order to characterise the meningococcal glycointeractome, glycan arrays representative of structures found on human cells, were used as a screening tool to investigate host glycans bound by N. meningitidis. Arrays probed with fluorescently labelled wild-type MC58 revealed binding to 223 glycans, including blood group antigens, mucins, gangliosides and glycosaminoglycans...
July 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28717425/high-throughput-nanoparticle-tracking-analysis-for-monitoring-outer-membrane-vesicle-production
#14
Matthias J H Gerritzen, Dirk E Martens, René H Wijffels, Michiel Stork
Outer membrane vesicles (OMVs) are spherical membrane nanoparticles released by Gram-negative bacteria. OMVs can be quantified in complex matrices by nanoparticle tracking analysis (NTA). NTA can be performed in static mode or with continuous sample flow that results in analysis of more particles in a smaller time-frame. Flow measurements must be performed manually despite the availability of a sample changer on the NanoSight system. Here we present a method for automated measurements in flow mode. OMV quantification in flow mode results in lower variance in particle quantification (coefficient of variation (CV) of 6%, CV static measurements of 14%)...
2017: Journal of Extracellular Vesicles
https://www.readbyqxmd.com/read/28717267/semen-culture-and-the-assessment-of-genitourinary-tract-infections
#15
REVIEW
Michael Solomon, Ralf Henkel
The male factor contributes approximately 50% to infertility-related cases in couples with an estimated 12%-35% of these cases attributable to male genital tract infections. Depending on the nature of the infection, testicular sperm production, sperm transport, and sperm function can be compromised. Yet, infections are potentially treatable causes of infertility. Male genital tract infections are increasingly difficult to detect. Moreover, they often remain asymptomatic ("silent") with the result that they are then passed on to the relevant sexual partner leading to fertilization and pregnancy failure as well as illness of the offspring...
July 2017: Indian Journal of Urology: IJU: Journal of the Urological Society of India
https://www.readbyqxmd.com/read/28711456/a-cross-sectional-study-assessing-the-pharyngeal-carriage-of-neisseria-meningitidis-in-subjects-aged-1-24-years-in-the-city-of-embu-das-artes-s%C3%A3-o-paulo-brazil
#16
Lily Yin Weckx, Rosana Fiorini Puccini, Antónia Machado, Maria Gisele Gonçalves, Suely Tuboi, Eliana de Barros, Raghavendra Devadiga, Eduardo Ortega-Barria, Romulo Colindres
Meningococcal carriage is a prerequisite for invasive infection. This cross-sectional study assessed the pharyngeal carriage prevalence in healthy subjects aged 1-24 years in Embu das Artes city, São Paulo, Brazil. Pharyngeal swabs were examined for the presence of Neisseria meningitidis. The isolates were tested for different serogroups using agglutination and polymerase chain reaction. A logistic regression model assessed any independent association between Neisseria meningitidis carriage and various risk factors...
July 13, 2017: Brazilian Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28708696/prevalence-of-human-immunodeficiency-virus-and-sexually-transmitted-infections-among-cisgender-and-transgender-women-sex-workers-in-greater-kuala-lumpur-malaysia-results-from-a-respondent-driven-sampling-study
#17
Jeffrey A Wickersham, Britton A Gibson, Alexander R Bazazi, Veena Pillai, Courtney J Pedersen, Jaimie P Meyer, Nabila El-Bassel, Kenneth H Mayer, Adeeba Kamarulzaman, Frederick L Altice
BACKGROUND: Sex workers face a disproportionate burden of human immunodeficiency virus (HIV) and sexually transmitted infections (STI) worldwide. For cisgender women sex workers (CWSW), global HIV prevalence is over 10%, whereas transgender women sex workers (TWSW) face an HIV burden of 19% to 27%. METHODS: We used respondent-driven sampling to recruit 492 sex workers, including CWSW (n = 299) and TWSW (n = 193) in Greater Kuala Lumpur, Malaysia. Participants completed an in-depth survey and were screened for HIV, syphilis, Chlamydia trachomatis, and Neisseria gonorrhoeae...
June 20, 2017: Sexually Transmitted Diseases
https://www.readbyqxmd.com/read/28708335/heterogeneity-in-non-epitope-loop-sequence-and-outer-membrane-protein-complexes-alters-antibody-binding-to-the-major-porin-protein-porb-in-serogroup-b-neisseria-meningitidis
#18
Kathryn A Matthias, Michael Brad Strader, Hesham F Nawar, Yamei S Gao, Joonseong Lee, Dhilon S Patel, Wonpil Im, Margaret C Bash
PorB is a well-characterized outer membrane protein that is common among Neisseria species and is required for survival. A vaccine candidate, PorB induces antibody responses that are directed against six variable surface-exposed loops that differ in sequence depending on serotype. Although N. meningitidis is naturally competent and porB genetic mosaicism provides evidence for strong positive selection, the sequences of PorB serotypes commonly associated with invasive disease are often conserved, calling into question the interaction of specific PorB loop sequences in immune engagement...
July 14, 2017: Molecular Microbiology
https://www.readbyqxmd.com/read/28707659/-drug-resistance-mutations-and-susceptibility-phenotypes-of-neisseria-gonorrhoeae-isolates-in-russia
#19
A A Kubanov, A T Leinsoo, A V Chestkov, E I Dementieva, B L Shaskolskiy, V S Solomka, D A Gryadunov, D G Deryabin
Steady growth in the degree of antimicrobial resistance in Neisseria gonorrhoeae calls for the control of the spreading of resistance mutations. Here we present the data describing drug resistance mutations, the results of antimicrobial susceptibility tests, and molecular genotypes of 128 recent N. gonorrhoeae isolates collected across 9 regions of the Russian Federation. The mutations in chromosome genes penA, ponA, rpsJ, gyrA, parC, which determine the susceptibility of N. gonorrhoeae to penicillins, tetracyclines, and fluoroquinolones were detected by multiplex amplification followed by hybridization on a hydrogel microarray...
May 2017: Molekuliarnaia Biologiia
https://www.readbyqxmd.com/read/28705462/effectiveness-of-a-group-b-outer-membrane-vesicle-meningococcal-vaccine-against-gonorrhoea-in-new-zealand-a-retrospective-case-control-study
#20
Helen Petousis-Harris, Janine Paynter, Jane Morgan, Peter Saxton, Barbara McArdle, Felicity Goodyear-Smith, Steven Black
BACKGROUND: Gonorrhoea is a major global public health problem that is exacerbated by drug resistance. Effective vaccine development has been unsuccessful, but surveillance data suggest that outer membrane vesicle meningococcal group B vaccines affect the incidence of gonorrhoea. We assessed vaccine effectiveness of the outer membrane vesicle meningococcal B vaccine (MeNZB) against gonorrhoea in young adults aged 15-30 years in New Zealand. METHODS: We did a retrospective case-control study of patients at sexual health clinics aged 15-30 years who were born between Jan 1, 1984, and Dec 31, 1998, eligible to receive MeNZB, and diagnosed with gonorrhoea or chlamydia, or both...
July 7, 2017: Lancet
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