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https://www.readbyqxmd.com/read/27923924/attenuation-of-the-type-iv-pilus-retraction-motor-influences-neisseria-gonorrhoeae-social-and-infection-behavior
#1
Alyson M Hockenberry, Danielle M Hutchens, Al Agellon, Magdalene So
: Retraction of the type IV pilus (Tfp) mediates DNA uptake, motility, and social and infection behavior in a wide variety of prokaryotes. To date, investigations into Tfp retraction-dependent activities have used a mutant deleted of PilT, the ATPase motor protein that causes the pilus fiber to retract. ΔpilT cells are nontransformable, nonmotile, and cannot aggregate into microcolonies. We tested the hypothesis that these retraction-dependent activities are sensitive to the strength of PilT enzymatic activity by using the pathogen Neisseria gonorrhoeae as a model...
December 6, 2016: MBio
https://www.readbyqxmd.com/read/27922851/future-prospects-for-new-vaccines-against-sexually-transmitted-infections
#2
Sami L Gottlieb, Christine Johnston
PURPOSE OF REVIEW: This review provides an update on the need, development status, and important next steps for advancing development of vaccines against sexually transmitted infections (STIs), including herpes simplex virus (HSV), Neisseria gonorrhoeae (gonorrhea), Chlamydia trachomatis (chlamydia), and Treponema pallidum (syphilis). RECENT FINDINGS: Global estimates suggest that more than a million STIs are acquired every day, and many new and emerging challenges to STI control highlight the critical need for development of new STI vaccines...
December 2, 2016: Current Opinion in Infectious Diseases
https://www.readbyqxmd.com/read/27921012/expression-of-the-gene-for-autotransporter-autb-of-neisseria-meningitidis-affects-biofilm-formation-and-epithelial-transmigration
#3
Jesús Arenas, Fernanda L Paganelli, Patricia Rodríguez-Castaño, Sara Cano-Crespo, Arie van der Ende, Jos P M van Putten, Jan Tommassen
Neisseria meningitidis is a Gram-negative bacterium that resides as a commensal in the upper respiratory tract of humans, but occasionally, it invades the host and causes sepsis and/or meningitis. The bacterium can produce eight autotransporters, seven of which have been studied to some detail. The remaining one, AutB, has not been characterized yet. Here, we show that the autB gene is broadly distributed among pathogenic Neisseria spp. The gene is intact in most meningococcal strains. However, its expression is prone to phase variation due to slipped-strand mispairing at AAGC repeats located within the DNA encoding the signal sequence and is switched off in the vast majority of these strains...
2016: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/27918267/outbreak-of-neisseria-meningitidis-capsular-group-w-among-scouts-returning-from-the-world-scout-jamboree-japan-2015
#4
Alison Smith-Palmer, Ken Oates, Diana Webster, Sarah Taylor, Kevin J Scott, Gemma Smith, Benjamin Parcell, Ann Lindstrand, Anders Wallensten, Hans Fredlund, Micael Widerström, Jim McMenamin
The 23rd World Scout Jamboree was held in Japan from 28 July to 8 August 2015 and was attended by over 33,000 scouts from 162 countries. An outbreak of invasive meningococcal disease capsular group W was investigated among participants, with four confirmed cases identified in Scotland, who were all associated with one particular scout unit, and two confirmed cases in Sweden; molecular testing showed the same strain to be responsible for illness in both countries. The report describes the public health action taken to prevent further cases and the different decisions reached with respect to how wide to extend the offer of chemoprophylaxis in the two countries; in Scotland, chemoprophylaxis was offered to the unit of 40 participants to which the four cases belonged and to other close contacts of cases, while in Sweden chemoprophylaxis was offered to all those returning from the Jamboree...
November 10, 2016: Euro Surveillance: Bulletin Européen sur les Maladies Transmissibles, European Communicable Disease Bulletin
https://www.readbyqxmd.com/read/27917346/neonatal-bacterial-meningitis-in-tikur-anbessa-specialized-hospital-ethiopia-a-10-year-retrospective-review
#5
Melese Abate Reta, Tamrat Abebe Zeleke
BACKGROUND: Bacterial meningitis is still a major public health threat in developing countries. It is an overwhelming infection with a high morbidity and mortality rate, especially in neonates. The aim of this study was to determine the prevalence and etiological agents that cause bacterial neonatal meningitis at Tikur Anbessa Specialized Hospital (TASH). METHODS: This is a retrospective analysis of 1189 cerebrospinal fluid (CSF) specimens submitted to the bacteriology laboratory of TASH for culture from 2001 to 2010...
2016: SpringerPlus
https://www.readbyqxmd.com/read/27916978/correlates-of-protection-against-neisseria-meningitidis
#6
Andrew Pollard
No abstract text is available yet for this article.
December 5, 2016: Nature Reviews. Immunology
https://www.readbyqxmd.com/read/27912986/a-phase-iii-observer-blind-randomized-controlled-study-to-evaluate-the-immune-response-and-the-correlation-with-nasopharyngeal-carriage-after-immunization-of-university-students-with-a-quadrivalent-meningococcal-acwy-glycoconjugate-or-serogroup-b-meningococcal
#7
Robert C Read, Peter Dull, Xilian Bai, Kate Nolan, Jamie Findlow, Rohit Bazaz, Annett Kleinschmidt, Maggie McCarthy, Huajun Wang, Daniela Toneatto, Ray Borrow
BACKGROUND: University students have high rates of pharyngeal carriage of Neisseria meningitidis. Interruption of carriage acquisition is an important mechanism of vaccines for inducing herd protection. 4CMenB and MenACWY-CRM vaccines have been shown to be immunogenic against meningococcal serogroups B and ACWY respectively in younger age groups, and also to elicit a modest impact on meningococcal carriage in vaccinated students. However, vaccine responses in university students and the impact of serum bactericidal antibody (SBA) titers on meningococcal carriage are undetermined...
November 29, 2016: Vaccine
https://www.readbyqxmd.com/read/27909580/burden-of-neisseria-meningitidis-infections-in-china-a-systematic-review-and-meta-analysis
#8
Yaowen Zhang, Dong Wei, Xinzhen Guo, Mai Han, Lichao Yuan, Moe H Kyaw
BACKGROUND: Neisseria meningitidis is a leading cause of bacterial meningitis and septicemia in children and young adults worldwide. The disease burden associated with N. meningitidis infections has not been systematically assessed in China. Therefore, we undertook this study to determine the burden of meningococcal disease in China. METHOD: We performed a systematic review and meta-analysis of articles on N. meningitidis incidence, carriage, seroprevalence and mortality rates in China by searching the Chinese BioMedical Database (CBM), China National Knowledge Infrastructure (CNKI), Wanfang database and PubMed for publications from January 2005 to Aug 2015...
December 2016: Journal of Global Health
https://www.readbyqxmd.com/read/27905998/sexually-transmitted-infections-and-pre-exposure-prophylaxis-challenges-and-opportunities-among-men-who-have-sex-with-men-in-the-us
#9
REVIEW
Hyman M Scott, Jeffrey D Klausner
Pre-Exposure Prophylaxis (PrEP) has shown high efficacy in preventing human immunodeficiency virus (HIV) infection among men who have sex with men (MSM) in several large clinical trials, and more recently in "real world" reports of clinical implementation and a PrEP demonstration project. Those studies also demonstrated high bacterial sexually transmitted infection (STI) incidence and raised the discussion of how PrEP may impact STI control efforts, especially in the setting of increasing Neisseria gonorrhoeae antimicrobial resistance and the increase in syphilis cases among MSM...
January 19, 2016: AIDS Research and Therapy
https://www.readbyqxmd.com/read/27904879/the-establishment-and-diversification-of-epidemic-associated-serogroup-w-meningococcus-in-the-african-meningitis-belt-1994-to-2012
#10
Adam C Retchless, Fang Hu, Abdoul-Salam Ouédraogo, Seydou Diarra, Kristen Knipe, Mili Sheth, Lori A Rowe, Lassana Sangaré, Absetou Ky Ba, Soumeya Ouangraoua, Dhwani Batra, Ryan T Novak, Rasmata Ouédraogo Traoré, Xin Wang
Epidemics of invasive meningococcal disease (IMD) caused by meningococcal serogroup A have been eliminated from the sub-Saharan African so-called "meningitis belt" by the meningococcal A conjugate vaccine (MACV), and yet, other serogroups continue to cause epidemics. Neisseria meningitidis serogroup W remains a major cause of disease in the region, with most isolates belonging to clonal complex 11 (CC11). Here, the genetic variation within and between epidemic-associated strains was assessed by sequencing the genomes of 92 N...
November 2016: MSphere
https://www.readbyqxmd.com/read/27904747/comparing-the-disk-diffusion-and-agar-dilution-tests-for-neisseria-gonorrhoeae-antimicrobial-susceptibility-testing
#11
Hsi Liu, Thomas H Taylor, Kevin Pettus, Steve Johnson, John R Papp, David Trees
BACKGROUND: We assessed the validity of testing for antimicrobial susceptibility of clinical and mutant Neisseria gonorrhoeae (GC) isolates by disk diffusion in comparison to agar dilution, and Etest® (bioMerieux, France), respectively, for three third generation extended spectrum cephalosporins (ESC): ceftriaxone (CRO), cefixime (CFX), and cefpodoxime (CPD). METHODS: One hundred and five clinical isolates and ten laboratory-mutants were tested following Clinical Laboratory Standard Institute (CLSI) and manufacturer's standards for each of the three methods...
2016: Antimicrobial Resistance and Infection Control
https://www.readbyqxmd.com/read/27902653/meningococcal-disease-in-children-in-argentina-a-three-year-active-sentinel-hospital-surveillance-study
#12
Ángela Gentile, Julia Bakir, María Rosa Agosti, Gabriela Ensinck, Hector Abate, Andrea Gajo Gane, Alejandro Santillán Iturres, Adriana Efron, Mabel Regueira, Ricardo Rüttimann
BACKGROUND: Meningococcal disease (MD) is a medical emergency and a serious public health problem. As new meningococcal vaccines become available, MD surveillance is crucial to provide baseline epidemiologic data before implementing preventive measures. We estimated MD incidence and epidemiology in Argentina using hospital-based surveillance. METHODS: 3-year prospective active surveillance in patients ≤15 years of age conducted at 6 pediatric hospital sentinel units (March 2012-February 2015)...
November 28, 2016: Pediatric Infectious Disease Journal
https://www.readbyqxmd.com/read/27902415/inversion-of-correia-repeat-enclosed-elements-in-neisseria-gonorrhoeae
#13
Firat Elbeyioglu, Sabrina B Roberts, Russell Spencer-Smith, Madhuri Pulijala, Marta A Zelewska, Jean-Christophe Nebel, Lori As Snyder
Neisseria gonorrhoeae is capable of causing gonorrhoea and more complex diseases in the human host. Within the gonococcal genome are over 100 copies of the IS-like Correia Repeat Enclosed Element, which has been predicted to be mobile within the neisserial genomes. Although there is evidence of ancestral movement of these elements, no previous study has provided evidence for current mobilisation. The Correia Repeat Enclosed Element has the ability to alter gene expression and regulation in many ways: by insertional mutagenesis; by introducing promoter elements; by generating mRNA processing sites, and by association with ncRNAs...
November 16, 2016: Microbiology
https://www.readbyqxmd.com/read/27898572/sexually-transmitted-infections-and-associated-risk-factors-among-street-based-and-residence-based-female-sex-workers-in-dhaka-bangladesh
#14
Rasheda Khanam, Masud Reza, Dilruba Ahmed, Mustafizur Rahman, M Shah Alam, Salima Sultana, Anadil Alam, Sharful I Khan, Kenneth H Mayer, Tasnim Azim
BACKGROUND: Female sex workers (FSWs) in Bangladesh remain at elevated risk of sexually transmitted infections (STIs) although the human immunodeficiency virus (HIV) prevalence among them is low. Recent information on the burden and etiological diagnosis of STIs among them has been lacking. This study examines prevalence and risk behaviors of selected STIs among FSWs in Dhaka in 2014. METHODS: Between August and October 2014, a cross-sectional study was conducted among street-based and residence-based FSWs receiving HIV prevention services at 24 drop in centers in Dhaka...
November 28, 2016: Sexually Transmitted Diseases
https://www.readbyqxmd.com/read/27898567/utilization-of-the-cepheid-xpert%C3%A2-ct-ng-sample-adequacy-control-to-determine-the-influence-of-the-urethral-swab-on-cellular-content-in-post-swab-versus-pre-swab-urine
#15
Stephen J Jordan, Barbara Van Der Pol, Edward W Hook
Chlamydia trachomatis/Neisseria gonorrhoeae assay performance in males is typically determined using post-swab urine, though pre-swab urine is used in practice. We collected swabs and urine from men and used the Cepheid Xpert® CT/NG sample adequacy control to determine the effect of swab collection on urine cellular content. No difference was observed.
November 28, 2016: Sexually Transmitted Diseases
https://www.readbyqxmd.com/read/27898565/quantitative-real-time-polymerase-chain-reaction-for-the-diagnosis-of-mycoplasma-genitalium-infection-in-south-african-men-with-and-without-symptoms-of-urethritis
#16
Marie Cecilia le Roux, Anwar Ahmed Hoosen
BACKGROUND: This study was done to diagnose Mycoplasma genitalium infection based on bacterial load in urine specimens from symptomatic and asymptomatic men. METHODS: Urine specimens from 94 men with visible urethral discharge, 206 with burning on micturition and 75 without symptoms presenting to a family practitioner were tested for M. genitalium as well as Neisseria gonorrhoeae, Chlamydia trachomatis, Trichomonas vaginalis by transcription-mediated amplification assays...
November 28, 2016: Sexually Transmitted Diseases
https://www.readbyqxmd.com/read/27895130/metq-of-neisseria-gonorrhoeae-is-a-surface-expressed-antigen-that-elicits-bactericidal-and-functional-blocking-antibodies
#17
Evgeny A Semchenko, Christopher J Day, Kate L Seib
Neisseria gonorrhoeae, the causative agent of the sexually transmitted infection (STI) gonorrhoea, is a growing public health threat for which a vaccine is urgently needed. We have characterized the functional role of the gonococcal MetQ protein, which is the methionine binding component of an ABC transporter system, and assessed its potential as a candidate antigen for inclusion in a gonococcal vaccine. MetQ is highly conserved in all strains investigated to date, it is localized on the bacterial surface, and it binds L-methionine with high affinity...
November 28, 2016: Infection and Immunity
https://www.readbyqxmd.com/read/27893854/dissemination-and-mechanism-for-the-mcr-1-colistin-resistance
#18
Rongsui Gao, Yongfei Hu, Zhencui Li, Jian Sun, Qingjing Wang, Jingxia Lin, Huiyan Ye, Fei Liu, Swaminath Srinivas, Defeng Li, Baoli Zhu, Ya-Hong Liu, Guo-Bao Tian, Youjun Feng
Polymyxins are the last line of defense against lethal infections caused by multidrug resistant Gram-negative pathogens. Very recently, the use of polymyxins has been greatly challenged by the emergence of the plasmid-borne mobile colistin resistance gene (mcr-1). However, the mechanistic aspects of the MCR-1 colistin resistance are still poorly understood. Here we report the comparative genomics of two new mcr-1-harbouring plasmids isolated from the human gut microbiota, highlighting the diversity in plasmid transfer of the mcr-1 gene...
November 2016: PLoS Pathogens
https://www.readbyqxmd.com/read/27890419/in-vitro-activity-of-tigecycline-alone-and-antimicrobial-combinations-against-clinical-neisseria-gonorrhoeae-isolates
#19
Hyukmin Lee, Hyunsoo Kim, Young Hee Seo, Dongeun Yong, Seok Hoon Jeong, Kyungwon Lee, Younsop Chong
In this study, we determined the in vitro activity of various combinations of antimicrobial agents against 54 Neisseria gonorrhoeae isolates. The combined activity of ceftriaxone (CRO) and azithromycin (AZM), CRO and doxycycline (DOX), CRO and spectinomycin (SPT), cefixime (CFX) and AZM, CFX and DOX, and CFX and SPT was determined using a checkerboard method. The fractional inhibitory concentration index (FICI) values for all combinations were either additive or indifferent, and no synergistic or antagonistic effects were found...
October 25, 2016: Diagnostic Microbiology and Infectious Disease
https://www.readbyqxmd.com/read/27889997/acute-cystitis-caused-by-commensal-neisseria-oralis-a-case-report-and-review-of-the-literature
#20
Yassar Alamri, Aaron Keene, Alan Pithie
Neisseria are usually harmless inhabitants of otherwise asymptomatic persons' upper respiratory mucosal surfaces. It is, therefore, expected that a disturbance in the physiology leads to non-gonococcal, non-meningococcal Neisseria becoming pathogenic. We report the case of a diabetic man who initially presented with non-specific symptoms and was later found to have cystitis caused by N. oralis. We also review the pertinent literature and discuss available evidence on pathophysiological mechanisms of infection with such commensal bacteria...
November 23, 2016: Infectious Disorders Drug Targets
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