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https://www.readbyqxmd.com/read/28222677/molecular-characterization-of-invasive-capsule-null-neisseria-meningitidis-in-south-africa
#1
Karistha Ganesh, Mushal Allam, Nicole Wolter, Holly B Bratcher, Odile B Harrison, Jay Lucidarme, Ray Borrow, Linda de Gouveia, Susan Meiring, Monica Birkhead, Martin C J Maiden, Anne von Gottberg, Mignon du Plessis
BACKGROUND: The meningococcal capsule is an important virulence determinant. Unencapsulated meningococci lacking capsule biosynthesis genes and containing the capsule null locus (cnl) are predominantly non-pathogenic. Rare cases of invasive meningococcal disease caused by cnl isolates belonging to sequence types (ST) and clonal complexes (cc) ST-845 (cc845), ST-198 (cc198), ST-192 (cc192) and ST-53 (cc53) have been documented. The clinical significance of these isolates however remains unclear...
February 21, 2017: BMC Microbiology
https://www.readbyqxmd.com/read/28222186/alpk1-controls-tifa-traf6-dependent-innate-immunity-against-heptose-1-7-bisphosphate-of-gram-negative-bacteria
#2
Milica Milivojevic, Anne-Sophie Dangeard, Christoph Alexander Kasper, Therese Tschon, Mario Emmenlauer, Claudine Pique, Pamela Schnupf, Julie Guignot, Cécile Arrieumerlou
During infection by invasive bacteria, epithelial cells contribute to innate immunity via the local secretion of inflammatory cytokines. These are directly produced by infected cells or by uninfected bystanders via connexin-dependent cell-cell communication. However, the cellular pathways underlying this process remain largely unknown. Here we perform a genome-wide RNA interference screen and identify TIFA and TRAF6 as central players of Shigella flexneri and Salmonella typhimurium-induced interleukin-8 expression...
February 21, 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28221124/two-cases-of-neisseria-meningitidis-proctitis-in-hiv-positive-men-who-have-sex-with-men
#3
José Gutierrez-Fernandez, Verónica Medina, Carmen Hidalgo-Tenorio, Raquel Abad
We report 2 cases from Spain of infectious proctitis caused by Neisseria meningitidis in HIV-positive men who have sex with men. Genetic characterization of the isolates showed that they are unusual strains not found in other more frequent meningococcal locations. This finding suggests an association between specific strains and anogenital tract colonization.
March 2017: Emerging Infectious Diseases
https://www.readbyqxmd.com/read/28220707/first-description-of-a-rifampicin-resistant-neisseria-meningitidis-serogroup-y-strain-causing-recurrent-invasive-meningococcal-disease-in-hungary
#4
Ákos Tóth, Brigitta Berta, Tamás Tirczka, Csilla Jekkel, Anita Ábrahám, Zoltán Prohászka, Zsófia Bognár, Tímea Erdősi
A Hungarian soldier previously immunized against Neisseria meningitidis by quadrivalent polysaccharide vaccine was twice infected with meningococci within six weeks. The patient was treated with ceftriaxone during both episodes and he successfully recovered. His close contacts received rifampicin prophylaxis. An investigation was performed to characterize the genetic background of the pathogens to ascertain if the recurrent invasive meningococcal disease was caused by the same strain and to find out the reason for reinfection...
February 21, 2017: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/28216070/corrigendum-to-changes-in-the-six-most-common-sequence-types-of-neisseria-gonorrhoeae-including-st4378-identified-by-surveillance-of-antimicrobial-resistance-in-northern-taiwan-from-2006-to-2013-j%C3%A2-microbiol-immunol-infect-49-5-2016-708-716
#5
Ching-Wai Cheng, Lan-Hui Li, Chen-Yi Su, Shu-Ying Li, Muh-Yong Yen
No abstract text is available yet for this article.
February 16, 2017: Journal of Microbiology, Immunology, and Infection, Wei Mian Yu Gan Ran za Zhi
https://www.readbyqxmd.com/read/28210887/drug-resistant-neisseria-gonorrhoeae-latest-developments
#6
REVIEW
B Suay-García, M T Pérez-Gracia
Gonorrhea is the second most frequently reported notifiable disease in the United States and is becoming increasingly common in Europe. The purpose of this review was to assess the current state of drug-resistant Neisseria gonorrhoeae in order to evaluate future prospects for its treatment. An exhaustive literature search was conducted to include the latest research regarding drug resistance and treatment guidelines for gonorrhea. Gonococci have acquired all known resistance mechanisms to all antimicrobials used for treatment...
February 16, 2017: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/28209713/mir-718-represses-pro-inflammatory-cytokine-production-through-targeting-pten
#7
Parisa Kalantari, Omid F Harandi, Sarika Agarwal, Florentina Rus, Evelyn A Kurt-Jones, Katherine A Fitzgerald, Daniel R Caffrey, Douglas T Golenbock
Bacterial sepsis involves a complex interaction between the host immune response and bacterial lipopolysaccharides (LPS). LPS binds Toll-like receptor (TLR) 4, which leads to the release of pro-inflammatory cytokines that are essential for a potent innate immune response against pathogens. The innate immune system is tightly regulated as excessive inflammation can lead to organ failure and death. MicroRNAs have recently emerged as important regulators of the innate immune system. Here, we determined the function of miR-718, which is conserved across mammals and overlaps with the 5 UTR of the Interleukin-1 Receptor-Associated Kinase (IRAK1) gene...
February 16, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28208911/meningitis-with-digital-gangrene-in-meningococcal-infection-an-atypical-presentation
#8
Jitendra Singh, Dandu Himanshu, Ranjit Kumar Nim, Anju Dinkar, Kamlesh Kumar Gupta
Meningococcal infection is an important public health concern. Neisseria meningitidis usually colonizes the nasopharynx of healthy adolescents and adults and remains as asymptomatic colonizer, while in rare cases it may present as invasive disease as either meningitis or septicemia or both. Most of the cases have typical presentation of rashes. We hereby present a case of a 40-year-old male who presented with meningococcal meningitis and peripheral digital gangrene but without development of typical rashes...
December 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28199766/dysbiosis-of-oral-buccal-mucosa-microbiota-in-patients-with-oral-lichen-planus
#9
Yuan He, Diping Gong, Cong Shi, Fangyang Shao, Jiahao Shi, Jian Fei
OBJECTIVE: The bacterial community structure of buccal mucosa in patients with oral lichen planus was evaluated and compared with healthy control. SUBJECTS AND METHODS: Buccal scraping samples have been taken on 43 oral lichen planus patients (21 erosive and 22 non-erosive) and 21 mucosal healthy volunteers. The V3 hypervariable 16S rDNA region were amplified and sequenced by high-throughput 454 pyrosequencing. RESULTS: 94.26% of the total buccal bacteria were classified into 15 abundant genera...
February 15, 2017: Oral Diseases
https://www.readbyqxmd.com/read/28196734/bactericidal-activity-of-sera-from-adolescents-vaccinated-with-bivalent-rlp2086-against-meningococcal-serogroup-b-outbreak-strains-from-france
#10
Muhamed-Kheir Taha, Julio Cesar Hawkins, Paul Liberator, Ala-Eddine Deghmane, Lubomira Andrew, Li Hao, Thomas R Jones, Lisa K McNeil, Robert E O'Neill, John L Perez, Kathrin U Jansen, Annaliesa S Anderson
OBJECTIVES: Bivalent rLP2086 (Trumenba®; MenB-FHbp), composed of two factor H binding proteins (FHbps), is a vaccine approved in the United States for prevention of Neisseria meningitidis serogroup B (MnB) invasive meningococcal disease (IMD). Bactericidal activity of sera from subjects vaccinated with bivalent rLP2086 was assessed against MnB isolates from recent disease outbreaks in France. METHODS: MnB isolates from IMD cases were characterized by whole genome sequencing and FHbp expression was assessed using a flow cytometry-based assay...
February 10, 2017: Vaccine
https://www.readbyqxmd.com/read/28196635/childhood-meningitis-in-kuwait-in-the-era-of-post-pneumococcal-conjugate-vaccination-a-multicenter-study
#11
Hussain Sadeq, Entesar H Husain, Amna Alkoot, Suha Atyani, Abdullah Al-Fraij, Abdulrahman Al-Daithan, Talal AlSaleem, Anfal Taher, May Alenezi
This is a retrospective study to evaluate epidemiology and etiologies of childhood meningitis in Kuwait after the routine introduction of the pneumococcal conjugate vaccine. The data was collected from 196 patients in the period of 2010-2014. Aseptic meningitis accounted for 51% of the cases, bacterial meningitis accounted for 29% cases and partially treated meningitis were 20%. Organisms causing bacterial meningitis were: Streptococcus pneumoniae 40.4%, Neisseria meningitidis 17.6%, Haemophilus spp. 12.2%, other gram positive or negative 19...
February 9, 2017: Journal of Infection and Public Health
https://www.readbyqxmd.com/read/28193899/structure-of-a-lipid-a-phosphoethanolamine-transferase-suggests-how-conformational-changes-govern-substrate-binding
#12
Anandhi Anandan, Genevieve L Evans, Karmen Condic-Jurkic, Megan L O'Mara, Constance M John, Nancy J Phillips, Gary A Jarvis, Siobhan S Wills, Keith A Stubbs, Isabel Moraes, Charlene M Kahler, Alice Vrielink
Multidrug-resistant (MDR) gram-negative bacteria have increased the prevalence of fatal sepsis in modern times. Colistin is a cationic antimicrobial peptide (CAMP) antibiotic that permeabilizes the bacterial outer membrane (OM) and has been used to treat these infections. The OM outer leaflet is comprised of endotoxin containing lipid A, which can be modified to increase resistance to CAMPs and prevent clearance by the innate immune response. One type of lipid A modification involves the addition of phosphoethanolamine to the 1 and 4' headgroup positions by phosphoethanolamine transferases...
February 13, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28193722/targeting-the-mucosal-barrier-how-pathogens-modulate-the-cellular-polarity-network
#13
Travis R Ruch, Joanne N Engel
The mucosal barrier is composed of polarized epithelial cells with distinct apical and basolateral surfaces separated by tight junctions and serves as both a physical and immunological barrier to incoming pathogens. Specialized polarity proteins are critical for establishment and maintenance of polarity. Many human pathogens have evolved virulence mechanisms that target the polarity network to enhance binding, create replication niches, move through the barrier by transcytosis, or bypass the barrier by disrupting cell-cell junctions...
February 13, 2017: Cold Spring Harbor Perspectives in Biology
https://www.readbyqxmd.com/read/28193667/whole-genome-sequencing-of-a-large-panel-of-contemporary-neisseria-gonorrhoeae-clinical-isolates-indicates-that-a-wild-type-mtra-gene-is-common-implications-for-inducible-antimicrobial-resistance
#14
Eshaw Vidyaprakash, A Jeanine Abrams, William M Shafer, David L Trees
Previous studies (1) have shown that the expression of the mtrCDE efflux pump operon is inducible at the transcriptional level in gonococci during incubation in sub-lethal concentrations of the nonionic detergent Triton X-100, which along with antibiotics, bile salts, progesterone and antimicrobial peptides, is a substrate of the MtrCDE efflux pump (2).….
February 13, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28192483/development-of-a-high-throughput-method-to-evaluate-serum-bactericidal-activity-using-bacterial-atp-measurement-as-survival-readout
#15
Francesca Necchi, Allan Saul, Simona Rondini
Serum Bactericidal Activity (SBA) assay is the method of choice to evaluate the complement-mediated functional activity of both infection- and vaccine-induced antibodies. To perform a typical SBA assay, serial dilutions of sera are incubated with target bacterial strains and complement. The conventional SBA assay is based on plating on agar the SBA reaction mix and counting the surviving bacterial colony forming units (CFU) at each serum dilution. Even with automated colony counting, it is labor-intensive, time-consuming and not amenable for large-scale studies...
2017: PloS One
https://www.readbyqxmd.com/read/28192236/diagnosis-of-primary-antibody-and-complement-immunodeficiencies-in-young-adults-after-a-first-invasive-bacterial-infection
#16
Sébastien Sanges, Frédéric Wallet, Nicolas Blondiaux, Didier Theis, Isabelle Verin, Anne Vachée, Rodrigue Dessein, Karine Faure, Nathalie Viget, Eric Senneville, Olivier Leroy, Fleur Maury, Nicolas Just, Julien Poissy, Daniel Mathieu, Anne Prévotat, Cécile Chenivesse, Arnaud Scherpereel, Grégoire Smith, Benjamin Lopez, Jérémie Rosain, Véronique Fremeaux-Bacchi, Eric Hachulla, Pierre-Yves Hatron, Mathilde Bahuaud, Frédéric Batteux, David Launay, Myriam Labalette, Guillaume Lefèvre
OBJECTIVES: Screening for primary immunodeficiencies (PIDs) in adults is recommended after two severe bacterial infections. We aimed to evaluate if screening should be performed after the first invasive infection in young adults. METHODS: Eligible patients were retrospectively identified using hospital discharge and bacteriology databases in 3 centers during a 3-year period. Eighteen to forty year-old patients were included if they had experienced an invasive infection with encapsulated bacteria commonly encountered in PIDs (Streptococcus pneumoniae (SP), Neisseria meningitidis (NM), Neisseria gonorrhoeae (NG), Haemophilus influenzae (HI) or group A Streptococcus (GAS))...
February 10, 2017: Clinical Microbiology and Infection
https://www.readbyqxmd.com/read/28191300/a-case-report-of-neisseria-mucosa-peritonitis-in-a-chronic-ambulatory-peritoneal-dialysis-patient
#17
Alan Awdisho, Maria Bermudez
Peritonitis is a leading complication of chronic ambulatory peritoneal dialysis. However, very rarely does Neisseria mucosa cause peritonitis. We describe an unusual case of N. mucosa peritonitis in a chronic ambulatory peritoneal dialysis patient. A 28-year-old Hispanic male presents with diffuse abdominal pain exacerbated during draining of the peritoneal fluid. Peritoneal fluid examination was remarkable for leukocytosis and gramnegative diplococci. Bacterial cultures were positive for N. mucosa growth. The patient was treated with ciprofloxacin with preservation of the dialysis catheter...
December 31, 2016: Infectious Disease Reports
https://www.readbyqxmd.com/read/28187809/management-of-bacterial-central-nervous-system-infections
#18
M C Brouwer, D van de Beek
Bacterial infections of the central nervous system present as a medical emergency, thus requiring rapid diagnosis and immediate treatment. The most prevalent bacterial infections seen in the intensive care unit can be summarized as acute bacterial meningitis, subdural empyema, intracerebral abscess, and ventriculitis, which all commonly involve the brain parenchyma. The infections can either be community-acquired or hospital-acquired, e.g., after neurosurgical intervention, as a complication of severe neurotrauma or related to indwelling cerebrospinal fluid drains...
2017: Handbook of Clinical Neurology
https://www.readbyqxmd.com/read/28182591/comparison-of-cobas-4800-m2000-viper-xtr-and-infinity-80-automated-instruments-when-processing-urine-specimens-for-the-diagnosis-of-chlamydia-trachomatis-and-neisseria-gonorrhoeae
#19
Max A Chernesky, Dan Jang, Jodi Gilchrist, Marek Smieja, Manuel Arias, Todd Hatchette, Andre Poirier, Donna Mayne, Sam Ratnam
OBJECTIVES: North American and European advisory groups recommend testing for Chlamydia trachomatis (CT) and Neisseria gonorrhoeae (NG) with nucleic acid amplification tests. Testing is often performed on automated instruments. The objectives of this study were to process urines for the diagnosis of CT and NG and to examine workflow procedures and outcomes. METHODS: While processing 1, 24, 48, 96, and 192 urine specimens on 3 batch-mode systems which use 96-well plates: cobas 4800, m2000, and Viper XTR and the random access cartridge testing GeneXpert Infinity 80, we measured assay performance, hands-on time for processing and maintenance, reagents and plastics consumption, time required to obtain results, and testing accuracy...
March 2017: Sexually Transmitted Diseases
https://www.readbyqxmd.com/read/28178114/resistance-to-ceftriaxone-and-azithromycin-in-neisseria-gonorrhoeae-isolates-from-7-countries-of-south-america-and-the-caribbean-2010-2011
#20
Sidharath Dev Thakur, Pamela Araya, Graciela Borthagaray, Patricia Galarza, Alina Llop Hernandez, Daisy Payares, Olga Marina Sanabria Cruz, Maria Elena Trigoso Carvallo, Aura Helena Corredor, Jo-Anne R Dillon
Seven countries in Latin America and the Caribbean report on (2010 and 2011) the susceptibility of 2235 isolates of Neisseria gonorrhoeae to 6 antibiotics. Thirteen isolates had ceftriaxone minimum inhibitory concentrations (MICs) of 0.125 to ≥ 0.25 mg/L. The percentage of resistant isolates to the following antibiotics was: azithromycin, 1.0% to 1.7%; ciprofloxacin, 42.1% to 36.2%; penicillin, 31% to 35%; tetracycline, 21.8% to 22.6%.
March 2017: Sexually Transmitted Diseases
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