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streptococcus pneumoniae

Christina M Abrams, Diego R Hijano, Bindiya Bagga
No abstract text is available yet for this article.
2018: Global Pediatric Health
Suvi Härmälä, Constantinos Parisinos, Laura Shallcross, Alastair O'Brien, Andrew Hayward
INTRODUCTION: In advanced chronic liver disease, diseases caused by common bacteria Streptococcus pneumoniae or influenza virus put people at an increased risk of serious health complications and death. The effectiveness of the available vaccines in reducing the risk of poor health outcomes, however, is less clear. METHODS AND ANALYSIS: We will search Medline (Ovid), Embase (Ovid), PubMed and Cochrane Central Register of Controlled Trials for published reports on randomised controlled trials and observational studies on the effectiveness of pneumococcal and influenza vaccines in people with chronic liver disease...
March 16, 2018: BMJ Open
Francesca Micoli, Paolo Costantino, Roberto Adamo
Cell surface carbohydrates have been proven optimal targets for vaccine development. Conjugation of polysaccharides to a carrier protein triggers a T-cell dependent immune response to the glycan moiety. Licensed glycoconjugate vaccines are produced by chemical conjugation of capsular polysaccharides to prevent meningitis caused by meningococcus, pneumococcus and Haemophilus influenzae type b. However, other classes of carbohydrates (O-antigens, exopolysaccharides, wall/teichoic acids) represent attractive targets for developing vaccines...
March 14, 2018: FEMS Microbiology Reviews
Xu Chen, Stefan Gustafsson, Thomas Whitington, Yan Borné, Erik Lorentzen, Jitong Sun, Peter Almgren, Jun Su, Robert Karlsson, Jie Song, Yi Lu, Yiqiang Zhan, Sara Hägg, Per Svensson, Karin E Smedby, Susan L Slager, Erik Ingelsson, Cecilia M Lindgren, Andrew P Morris, Olle Melander, Thomas Karlsson, Ulf de Faire, Kenneth Caidahl, Gunnar Engström, Lars Lind, Mikael C I Karlsson, Nancy L Pedersen, Johan Frostegård, Patrik K E Magnusson
Phosphorylcholine (PC) is an epitope on oxidized low-density lipoprotein (oxLDL), apoptotic cells and several pathogens like Streptococcus pneumoniae. Immunoglobulin M against PC (IgM anti-PC) has the ability to inhibit uptake of oxLDL by macrophages and increase clearance of apoptotic cells. From our genome-wide association studies (GWAS) in four European-ancestry cohorts, six SNPs in 11q24.1 were discovered (in 3002 individuals) and replicated (in 646 individuals) to be associated with serum level of IgM anti-PC (the leading SNP rs35923643-G, combined beta=0...
March 14, 2018: Human Molecular Genetics
Florencia Escarrá, Ana G Fedullo, Natalia Veliz, Julián Rosa, Rodrigo Oribe, Marisa Di Santo, Bqca Vanesa Reijtman, Lic Alejandra Mastroianni, Guadalupe Pérez
INTRODUCTION: the incidence of invasive infections caused by pneumococcus (Streptococcus pneumoniae) has declined since generalized vaccination with pneumococcal conjugated vaccine, but it is still a prevalent pathogen in children. Amongst pneumococcal invasive infections, IE (infectious endocarditis) is rare, with an incidence between 1 and 7%. CASE REPORT: We describe the case of a previously healthy 4 year old boy, who had received one dose of 10-valent pneumococcal conjugate vaccine who presents with fever, a new heart murmur and heart failure...
December 2017: Revista Chilena de Pediatría
Hassan Al Moussawi, Michael Krzyzak, Zainab Awada, Jean M Chalhoub
A brain abscess is defined as a focal intracerebral infection consisting of an encapsulated collection of pus, which can be a life-threatening complication of infections, trauma, or surgery. While immunocompromised patients can have a wide array of causative organisms, bacterial species represent the most common etiology in immunocompetent individuals. The incidence of brain abscesses ranges from 0.4 to 0.9 per 100,000, with a high predisposition among immunocompromised patients and in those with disruption of the blood-brain barrier...
January 13, 2018: Curēus
Catia Cilloniz, Miquel Ferrer, Adamanthia Liapikou, Carolina Garcia-Vidal, Albert Gabarrus, Adrian Ceccato, Jorge Puig de La Bellacasa, Francesco Blasi, Antoni Torres
Question: To assess the incidence, characteristics, aetiology, risk factors and mortality of acute respiratory distress syndrome (ARDS) in ICU patients with community-acquired pneumonia (CAP) using the Berlin definition. Methods: We prospectively enrolled consecutive mechanically-ventilated ICU adults with CAP over 20 years, compared with mechanically-ventilated patients without ARDS. The main outcome was 30-day mortality. Results: Among 5,334 patients hospitalized with CAP, 930 (17%) were admitted to the ICU, and 432 required mechanical ventilation; 125 (29%) cases met the Berlin ARDS criteria...
March 15, 2018: European Respiratory Journal: Official Journal of the European Society for Clinical Respiratory Physiology
Lingling Gan, Xuemei Zhang, Xiuyu Xu, Wenchun Xu, Chang Lu, Jin Cui, Hong Wang
<i>spd1672</i>, a novel <i>Streptococcus pneumoniae</i> (<i>S. pn</i>) gene induced in vivo, has been identified to contribute to the virulence of <i>S. pn</i>; however, the role of <i>spd1672</i> during host innate immune reaction against<i> S. pn</i> infection is unknown. In the present study, mice were infected with wild type D39 and mutant D39Δspd1672 strains. Compared to the D39-infected mice, reduced bacterial load and attenuated inflammatory response were observed in the D39Δ<i>spd1672</i>-treated mice...
March 15, 2018: Canadian Journal of Microbiology
Carol Kelly, James D Chalmers, Iain Crossingham, Nicola Relph, Lambert M Felix, David J Evans, Stephen J Milan, Sally Spencer
BACKGROUND: Bronchiectasis is a chronic respiratory disease characterised by abnormal and irreversible dilatation and distortion of the smaller airways. Bacterial colonisation of the damaged airways leads to chronic cough and sputum production, often with breathlessness and further structural damage to the airways. Long-term macrolide antibiotic therapy may suppress bacterial infection and reduce inflammation, leading to fewer exacerbations, fewer symptoms, improved lung function, and improved quality of life...
March 15, 2018: Cochrane Database of Systematic Reviews
Anne Dommaschk, Lara F Lang, Regina Maus, Jennifer Stolper, Tobias Welte, Ulrich A Maus
Nasopharyngeal colonization with Streptococcus pneumoniae (the pneumococcus) is known to mount protective adaptive immune responses in rodents and humans. However, the cellular response of the nasopharyngeal compartment to pneumococcal colonization and its importance for the ensuing adaptive immune response is only partially defined. Here we show that nasopharyngeal colonization with S. pneumoniae triggered substantial expansion of both integrin αE (CD103) positive dendritic cells (DC) and T lymphocytes in nasopharynx, nasal-associated lymphoid tissue (NALT) and cervical lymph nodes (CLN) of WT mice...
March 15, 2018: European Journal of Immunology
Toumi Sano, Tamaho Suzuki, Ayako Nishigori, Chiharu Miyatake, Shinya Koizumi, Kiyohiko Kaizu, Atsushi Fujita, Mitsuhiro Kamisago, Bin Chang, Naruhiko Ishiwada, Takeshi Asano
The introduction of the Haemophilus influenzae type b (Hib) vaccine and the 7-valent pneumococcal conjugate vaccine (PCV7) has led to dramatic reductions in cases of invasive H. influenzae disease and invasive pneumococcal disease (IPD). After the introduction of the PCV7 and the 13-valent pneumococcal conjugate vaccine (PCV13), the number of children with IPD markedly decreased in our hospital. However, since 2015, three children with IPD have been admitted to our hospital. We analyzed the serotype, multilocus sequence type, and antimicrobial susceptibility of Streptococcus pneumoniae strains isolated in these newly diagnosed cases...
2018: Journal of Nippon Medical School, Nippon Ika Daigaku Zasshi
Jin Yang Baek, Cheol-In Kang, So Hyun Kim, Kwan Soo Ko, Doo Ryeon Chung, Kyong Ran Peck, Nam Yong Lee, Jae-Hoon Song
The use of fluoroquinolones to treat respiratory tract infections and pneumonia due to Streptococcus pneumoniae has affected the emergence of resistance to this class of drugs. Increasing pneumococcal resistance to levofloxacin has become a major public health concern. We investigated the prevalence and genetic characteristics of levofloxacin-nonsusceptible S. pneumoniae (LNSP) clinical isolates in Korea. A total of 43 LNSP isolates collected from a national surveillance study at 13 tertiary hospitals between 2008 and 2014 were analyzed for serotype and antimicrobial susceptibilities to 19 antimicrobial agents as well as the quinolone resistance-determining region mutation...
February 16, 2018: Diagnostic Microbiology and Infectious Disease
Carlos M Luna, Laura Pulido, Diego Burgos
PURPOSE OF REVIEW: As Streptococcus pneumoniae was considered the etiological agent of nearly all the cases of pneumonia at the beginning of the 20th century, and today is identified in fewer than 10-15% of cases, we analyze the possible causes of such a decline. RECENT FINDINGS: Extensive use of early empiric antimicrobial therapy, discovery of previously unrecognized pathogens, availability to newer diagnostic methods for the recognition of the pneumonia pathogens (PCR, urinary antigens, monoclonal antibodies etc...
March 13, 2018: Current Opinion in Pulmonary Medicine
M Georgieva, L Kagedan, Ying-Jie Lu, C M Thompson, M Lipsitch
Genomic analysis reveals extensive sequence variation and hot spots of recombination in surface proteins of Streptococcus pneumoniae While this phenomenon is commonly attributed to diversifying selection by host immune responses, there is little mechanistic evidence for the hypothesis that diversification of surface protein antigens produces an immune escape benefit during infection with S. pneumoniae Here, we investigate the biological significance of sequence variation within the S. pneumoniae cell wall-associated pneumococcal surface protein C (PspC) protein antigen...
March 13, 2018: MBio
L L Chen, D L Han, Y F Zhai, J H Wang, Y F Wang, M Chen
Current clinical treatments for pneumococcal infections have many limitations and are faced with many challenges. New capsular polysaccharide structures must be explored to cope with diseases caused by different serotypes of Streptococcus pneumoniae. UDP-galactose 4-epimerase (GalE) is an essential enzyme involved in polysaccharide synthesis. It is an important virulence factor in many bacterial pathogens. In this study, we found that two genes (galEsp1 and galEsp2) are responsible for galactose metabolism in pathogenic S...
January 2018: Biochemistry. Biokhimii︠a︡
Kennedy Daniel Mwambete, Mathias Eulambius
OBJECTIVES: The study aimed to determine the prevalence of otitis media (OM)-associated bacterial flora of asymptomatic people living with HIV (PLH) on antiretroviral therapy (ART) and assess antibiotic resistance profiles of the bacteria. METHODOLOGY: Ear secretion specimens were collected by syringe or cotton swabs. Isolated bacteria were subjected to antibiotic sensitivity tests. RESULTS: Of 290 recruited PLH, 81.7% were females and 18...
January 2018: Journal of the International Association of Providers of AIDS Care
Bernard Louizette Christophe, Mariana Mott, Gabriela da Cunha, Juliana Caierão, Pedro D Azevedo, Cícero Dias
PURPOSE: Invasive pneumococcal disease (IPD) in the elderly is an important public health issue due to the increased proportion of this population in many countries including Brazil. We aimed to characterise pneumococci isolates in adults >50 years with IPD, following the introduction of the 10-valent pneumococcal conjugate vaccine (PCV10) as part of the National Childhood Immunisation Program for children ≤2 years in March 2010. METHODOLOGY: Between 2013 and 2015, pneumococcal isolates were collected and serotypes were determined using multiplex PCR and/or Quellung reaction...
March 13, 2018: Journal of Medical Microbiology
Umut Gazi, Djursun Karasartova, Ibrahim Tayfun Sahiner, Ayse Semra Gureser, Ozgur Tosun, Mehmet Kursat Derici, Mete Dolapci, Aysegul Taylan Ozkan
AIM: Splenectomised patients are associated with lifelong risk of fatal overwhelming post-splenectomy infection (OPSI), which is mostly caused by Streptococcus pneumoniae. Today OPSI cases can still be reported even in patients with appropriate vaccination. In our study, the levels of vaccine-specific memory B- and T cells were compared between control and splenectomised patients to enlighten the underlying reason. MATERIALS AND METHODS: Five healthy and 14 post-traumatic splenectomised individuals were vaccinated with 13-valent pneumococcal conjugate vaccine (PCV-13) followed by 23-valent pneumococcal polysaccharide vaccine (PPV-23)...
March 13, 2018: International Journal of Clinical Practice
Nafisatu Bello, Abubakar Tukur Dawakin Kudu, Azeezat Bolanle Adetokun, Dalha Wada Taura, Yusuf Dan'asabe Jobbi, Mustapha Umar, Ibrahim Yusuf
Background and Objectives: Bacterial infection in sickle cell anaemic patients is a major cause of mortality and requires proper treatment with appropriate antibiotics. However, continue defiant of these infections causing pathogens to many antibiotics and inadequate screening methods in overburden health care facilities such as our in Kano, Nigeria necessitates the conduct of this study. A research was therefore conducted to isolate, characterize and test for antimicrobial susceptibility of bacteraemia-causing pathogens from febrile children with and without sickle cell disease in Kano, Nigeria...
2018: Mediterranean Journal of Hematology and Infectious Diseases
Chenghe Xiong, Shaojie Feng, Yin Qiao, Zhongwu Guo, Guofeng Gu
A highly convergent and efficient strategy was developed for the synthesis of complex oligosaccharides of Streptococcus pneumoniae type 3 capsular polysaccharide containing multiple glucuronic acid units. After oligoglucosides were effectively and stereoselectively assembled, the designated glucose units were regioselectively oxidized to glucuronic acid in one step at the final synthetic stage, which helped avoid difficult glycosylations involving glucuronic acid. The target oligosaccharides had a free amino group at the reducing end and varied caps at the non-reducing end to enable further modification and structure-activity relationship study...
March 12, 2018: Chemistry: a European Journal
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