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https://www.readbyqxmd.com/read/28318768/clinical-development-strategy-for-a-candidate-group-a-streptococcal-vaccine
#1
REVIEW
Florian Schödel, Nicole J Moreland, Janet T Wittes, Kim Mulholland, Ian Frazer, Andrew C Steer, John D Fraser, Jonathan Carapetis
GroupA streptococci (GAS) cause a wide spectrum of diseases ranging from benign pharyngitis and skin infections to severe invasive disease and the immune sequelae rheumatic fever and rheumatic heart disease. Pharyngitis, one of the most frequent diseases caused by GAS, is highly prevalent in school-age children in temperate climates and a major cause of antibiotic use. An efficacious vaccine would reduce disease burden associated with pharyngitis and the need of care for sick children. Importantly, GAS pharyngitis is recognised as the main precursor for acute rheumatic fever so a vaccine that is efficacious against GAS pharyngitis should also prevent acute rheumatic fever and rheumatic heart disease...
March 16, 2017: Vaccine
https://www.readbyqxmd.com/read/28318629/machine-learning-algorithms-define-pathogen-specific-local-immune-fingerprints-in-peritoneal-dialysis-patients-with-bacterial-infections
#2
Jingjing Zhang, Ida M Friberg, Ann Kift-Morgan, Gita Parekh, Matt P Morgan, Anna Rita Liuzzi, Chan-Yu Lin, Kieron L Donovan, Chantal S Colmont, Peter H Morgan, Paul Davis, Ian Weeks, Donald J Fraser, Nicholas Topley, Matthias Eberl
The immune system has evolved to sense invading pathogens, control infection, and restore tissue integrity. Despite symptomatic variability in patients, unequivocal evidence that an individual's immune system distinguishes between different organisms and mounts an appropriate response is lacking. We here used a systematic approach to characterize responses to microbiologically well-defined infection in a total of 83 peritoneal dialysis patients on the day of presentation with acute peritonitis. A broad range of cellular and soluble parameters was determined in peritoneal effluents, covering the majority of local immune cells, inflammatory and regulatory cytokines and chemokines as well as tissue damage-related factors...
March 16, 2017: Kidney International
https://www.readbyqxmd.com/read/28314902/potential-factors-enabling-human-body-colonization-by-animal-streptococcus-dysgalactiae-subsp-equisimilis-strains
#3
Marcin Ciszewski, Eligia M Szewczyk
Streptococcus dysgalactiae subsp. equisimilis (SDSE) is a pyogenic, Lancefield C or G streptococcal pathogen. Until recently, it has been considered as an exclusive animal pathogen. Nowadays, it is responsible for both animal infections in wild animals, pets, and livestock and human infections often clinically similar to the ones caused by group A streptococcus (Streptococcus pyogenes). The risk of zoonotic infection is the most significant in people having regular contact with animals, such as veterinarians, cattlemen, and farmers...
March 18, 2017: Current Microbiology
https://www.readbyqxmd.com/read/28302546/rheumatic-heart-disease-epidemiology-and-health-systems-barriers-and-facilitators-a-systematic-review-of-studies-from-uganda-and-tanzania
#4
Annesinah H Moloi, Sumaya Mall, Mark E Engel, Renae Stafford, Zhang Wan Zhu, Liesl J Zuhlke, David A Watkins
BACKGROUND: Rheumatic heart disease (RHD) is an important and preventable cause of cardiovascular disease. OBJECTIVES: As part of a recent RHD initiative in Uganda and Tanzania, we systematically reviewed group A streptococcal disease (GAS), acute rheumatic fever (ARF), and RHD in these countries. METHODS: Using a systematic review and meta-analysis/meta-synthesis, we searched PubMed, Embase, and grey literature for quantitative and qualitative studies conducted in Uganda and Tanzania that included individuals affected by GAS, ARF, and RHD...
March 14, 2017: Global Heart
https://www.readbyqxmd.com/read/28288328/case-control-exploratory-study-of-cerebrospinal-fluid-chemokines-cytokines-and-lymphocyte-subsets-in-childhood-tourette-syndrome-with-positive-streptococcal-markers
#5
Michael R Pranzatelli, Elizabeth D Tate, Tyler J Allison
A longstanding question is whether neuroinflammation is present in children symptomatic for Tourette syndrome (TS) with positive streptococcal serology and throat cultures. The objective was to directly test for it using modern hypothesis-driven approaches. Profiling studies for 14 immune cell types (flow cytometry), 7 chemokines/cytokines (ELISA), oligoclonal bands, and other immunoglobulins were performed in this IRB-approved study of 5 children with TS and streptococcal markers compared to data from 26 non-inflammatory pediatric neurological controls...
March 10, 2017: Cytokine
https://www.readbyqxmd.com/read/28285457/group-a-streptococcus-acute-rheumatic-fever-and-rheumatic-heart-disease-epidemiology-and-clinical-considerations
#6
REVIEW
Liesl J Zühlke, Andrea Beaton, Mark E Engel, Christopher T Hugo-Hamman, Ganesan Karthikeyan, Judith M Katzenellenbogen, Ntobeko Ntusi, Anna P Ralph, Anita Saxena, Pierre R Smeesters, David Watkins, Peter Zilla, Jonathan Carapetis
Early recognition of group A streptococcal pharyngitis and appropriate management with benzathine penicillin using local clinical prediction rules together with validated rapi-strep testing when available should be incorporated in primary health care. A directed approach to the differential diagnosis of acute rheumatic fever now includes the concept of low-risk versus medium-to-high risk populations. Initiation of secondary prophylaxis and the establishment of early medium to long-term care plans is a key aspect of the management of ARF...
February 2017: Current Treatment Options in Cardiovascular Medicine
https://www.readbyqxmd.com/read/28283948/evaluation-of-the-potency-neutralizing-antibody-response-and-stability-of-a-recombinant-fusion-protein-vaccine-for-streptococcus-pyogenes
#7
E Burlet, H HogenEsch, A Dunham, G Morefield
Streptococcus pyogenes or group A streptococcus (GAS) is a Gram-positive bacterium that can cause a wide range of diseases, including pharyngitis, impetigo, scarlet fever, necrotizing fasciitis, rheumatic fever, and streptococcal toxic shock syndrome. Despite the increasing burden on global health caused by GAS, there is currently no licensed vaccine available. In this study, we evaluated immunogenicity, induction of neutralizing antibodies, and stability of a new recombinant fusion protein vaccine that targets infections from GAS...
March 10, 2017: AAPS Journal
https://www.readbyqxmd.com/read/28283012/-evaluation-of-mascia-brunelli-rapid-antigen-test-in-the-diagnosis-of-group-a-streptococcal-pharyngitis
#8
Ayşe Barış, Nur Anlıaçık, Mehmet Emin Bulut, Rıdvan Deniz, Elif Yücel, Elif Aktaş
Pharyngitis in most cases is due to viral microorganisms however drug therapy without the detection of etiological agent leads to unnecessary use of antibiotics. On the other hand, when the etiologic agent is group A beta-hemolytic streptococci (GAS) it is important to identify the etiologic agent rapidly which will guide the treatment with appropriate antibiotics. The use of highly sensitive rapid tests will contribute significantly to early diagnosis and appropriate therapy. The aim of this study is to evaluate the efficacy of Mascia Brunelli rapid antigen test for the detection of GAS in throat swab samples...
January 2017: Mikrobiyoloji Bülteni
https://www.readbyqxmd.com/read/28276804/screening-for-early-onset-invasive-group-b-streptococcal-disease-in-neonates-in-an-irish-hospital-2001-2014-a-retrospective-audit
#9
Maryke Nielsen, Naveed Sheikh, Eoin Fitzgerald, Mary Meehan, David LeBlanc, Maeve Eogan, Afif El-Khuffash, Richard J Drew
Group B Streptococcus (GBS) is the most common cause of early-onset neonatal sepsis and meningitis. In babies with no clinical suspicion of infection, who are at risk of early-onset invasive disease based on maternal risk factors, blood cultures are taken to detect bacteraemia. In our institution, lumbar punctures are performed in infants with clinical signs of sepsis but not in infants who are well at the time of screening. Between 2001 and 2014, there were 112,361 live births weighing >500 g, of whom 13,959 (12...
February 6, 2017: Infectious Diseases
https://www.readbyqxmd.com/read/28274774/group-b-streptococcal-colonization-and-transmission-dynamics-in-pregnant-women-and-their-newborns-in-nigeria-implications-for-prevention-strategies
#10
Nubwa Medugu, Kenneth C Iregbu, Robert E Parker, Jessica Plemmons, Pallavi Singh, Lamidi I Audu, Efena Efetie, H Dele Davies, Shannon D Manning
OBJECTIVES: Because few studies have been conducted on group B Streptococcus (GBS) in Nigeria, we sought to estimate GBS colonization and transmission frequencies for 500 women and their newborns and identify risk factors for both outcomes. METHODS: GBS strains were characterized for antibiotic susceptibilities, capsule (cps) genotype, pilus island profile, and multilocus sequence type (ST). RESULTS: In all, 171 (34.2%) mothers and 95 (19...
March 5, 2017: Clinical Microbiology and Infection
https://www.readbyqxmd.com/read/28260599/peritonsillar-abscess-clinical-aspects-of-microbiology-risk-factors-and-the-association-with-parapharyngeal-abscess
#11
REVIEW
Tejs Ehlers Klug
PTA is a collection of pus located between the tonsillar capsule and the pharyngeal constrictor muscle. It is considered a complication of acute tonsillitis and is the most prevalent deep neck infection (approximately 2000 cases annually in Denmark) and cause of acute admission to Danish ENT departments. Teenagers and young adults are most commonly affected and males may predominate over females. However, no studies of age- and gender-stratified incidence rates have previously been published. Furthermore, smoking may be associated with increased risk of peritonsillar abscess (PTA) development, although the magnitude of the association has not been estimated...
March 2017: Danish Medical Journal
https://www.readbyqxmd.com/read/28247153/group-b-streptococcal-pcr-testing-in-comparison-to-culture-for-diagnosis-of-late-onset-bacteraemia-and-meningitis-in-infants-aged-7-90-days-a-multi-centre-diagnostic-accuracy-study
#12
S M Morrissey, M Nielsen, L Ryan, H Al Dhanhani, M Meehan, S McDermott, N O'Sullivan, M Doyle, P Gavin, N O'Sullivan, R Cunney, R J Drew
The aim of this study was to compare an in-house real-time PCR assay, with bacterial culture as the reference, for the diagnosis of late onset group B Streptococcal (GBS) disease. This was a retrospective review. All children aged 7-90 days presenting to four paediatric centres that had a blood or CSF sample tested by GBS PCR were included. Of 7,686 blood and 2,495 cerebrospinal fluid (CSF) samples from patients of all ages received for PCR testing, 893 and 859 samples were eligible for the study, respectively...
March 1, 2017: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/28238245/rheumatic-fever-and-rheumatic-heart-disease-collaboration-patterns-and-research-core-topics
#13
Alejandro Salinas, Gregorio González, Jose Manuel Ramos
BACKGROUND: Rheumatic fever and rheumatic heart disease (RHD) are important health problems in developing countries. The study aim was to provide a review and content analysis of the scientific literature on rheumatic fever and RHD over a 70-year period. METHODS: Medline was employed via the online PubMed service of the US National Library of Medicine, to search for all documents containing the MeSH terms 'rheumatic fever' or 'rheumatic heart disease' between January 1945 and December 2013...
September 2016: Journal of Heart Valve Disease
https://www.readbyqxmd.com/read/28237623/effect-of-underlying-immune-compromise-on-the-manifestations-and-outcomes-of-group-a-streptococcal-bacteremia
#14
Kathleen A Linder, Leen Alkhouli, Mayur Ramesh, George A Alangaden, Carol A Kauffman, Marisa H Miceli
BACKGROUND: Group A streptococcal bloodstream infection is the most common presentation of invasive group A streptococcal disease. We sought to determine the impact of immunosuppression on severity of disease and clinical outcomes. METHODS: This retrospective review of 148 patients with at least one positive blood culture for Streptococcus pyogenes from 1/2003 to 3/2013 compared immunocompromised patients with those with no immunocompromise in regards to development of severe complications and mortality...
February 22, 2017: Journal of Infection
https://www.readbyqxmd.com/read/28236250/group-b-streptococcal-disease-in-infants-in-the-first-year-of-life-a-nationwide-surveillance-study-in-japan-2011-2015
#15
Kousaku Matsubara, Kiyoshi Hoshina, Masatoshi Kondo, Isao Miyairi, Yoshiya Yukitake, Yusuke Ito, Kisei Minami, Ryuichi Genkawa
PURPOSE: This study aimed to describe the epidemiology of childhood group B streptococcus (GBS) disease including late late-onset disease (LLOD) and to clinically characterize recurrent cases and twin-sibling cases in Japan. METHODS: We collected information on infants (<1 year of age) with invasive GBS disease and institutional information about births and transfers through a nationwide questionnaire between 2011 and 2015. RESULTS: We identified 133 infants with early-onset disease (EOD), 274 late-onset disease (LOD), and 38 LLOD from 149 institutes...
February 25, 2017: Infection
https://www.readbyqxmd.com/read/28230706/first-presentation-acute-rheumatic-fever-is-preventable-in-a-community-setting-a-school-based-intervention
#16
Diana Lennon, Philippa Anderson, Melissa Kerdemelidis, Elizabeth Farrell, Suzanne Crengle Mahi, Teuila Percival, David Jansen, Joanna Stewart
BACKGROUND: Robust evidence is lacking for community initiatives to prevent first presentation acute rheumatic fever (ARF) by group A streptococcal (GAS) pharyngitis treatment. METHODS: We measured the effect of introducing a sore throat clinic program on first presentation ARF into 61 year 1-8 schools with students aged 5-13years (population ~ 25,000) in Auckland, New Zealand. The study period was 2010-2016. A generalized linear mixed model investigated ARF rate changes before and after the staggered introduction of school clinics...
February 22, 2017: Pediatric Infectious Disease Journal
https://www.readbyqxmd.com/read/28222125/streptococcus-sanguinis-induces-neutrophil-cell-death-by-production-of-hydrogen-peroxide
#17
Ryuichi Sumioka, Masanobu Nakata, Nobuo Okahashi, Yixuan Li, Satoshi Wada, Masaya Yamaguchi, Tomoko Sumitomo, Mikako Hayashi, Shigetada Kawabata
Streptococcus is the dominant bacterial genus in the human oral cavity and a leading cause of infective endocarditis. Streptococcus sanguinis belongs to the mitis group of streptococci and produces hydrogen peroxide (H2O2) by the action of SpxB, a pyruvate oxidase. In this study, we investigated the involvement of SpxB in survival of S. sanguinis in human blood and whether bacterial H2O2 exhibits cytotoxicity against human neutrophils. Results of a bactericidal test with human whole blood revealed that the spxB mutation in S...
2017: PloS One
https://www.readbyqxmd.com/read/28220899/group-a-streptococcal-m1-protein-provides-resistance-against-the-antimicrobial-activity-of-histones
#18
Simon Döhrmann, Christopher N LaRock, Ericka L Anderson, Jason N Cole, Brinda Ryali, Chelsea Stewart, Poochit Nonejuie, Joe Pogliano, Ross Corriden, Partho Ghosh, Victor Nizet
Histones are essential elements of chromatin structure and gene regulation in eukaryotes. An unexpected attribute of these nuclear proteins is their antimicrobial activity. A framework for histone release and function in host defense in vivo was revealed with the discovery of neutrophil extracellular traps, a specialized cell death process in which DNA-based structures containing histones are extruded to ensnare and kill bacteria. Investigating the susceptibility of various Gram-positive pathogens to histones, we found high-level resistance by one leading human pathogen, group A Streptococcus (GAS)...
February 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28218632/clinical-case-of-the-month-group-g-streptococcal-bacteremia-secondary-to-a-burn-wound-infection
#19
Paige Deichmann, Amol Sura, Charles Sanders, Nisha Aravindakshan-Patel, Fred Lopez
A 61-year-old man presented to the emergency department with second degree burns along his right arm and hand. He reported that his knees suddenly gave out while holding a pot of soup resulting in the scalding liquid spilling over his arm. His medical history is significant for alcohol abuse, chronic obstructive pulmonary disease, atrial fibrillation, congestive heart failure with preserved ejection fraction, chronic knee instability, and degenerative joint disease of the spine.
January 2017: Journal of the Louisiana State Medical Society: Official Organ of the Louisiana State Medical Society
https://www.readbyqxmd.com/read/28202416/microarray-analysis-of-macrophage-response-to-infection-with-streptococcus-oralis-reveals-the-immunosuppressive-effect-of-hydrogen-peroxide
#20
Hitomi Matsushima, Yutaro Kumagai, Alexis Vandenbon, Hideo Kataoka, Miki Kadena, Haruka Fukamachi, Takafumi Arimoto, Hirobumi Morisaki, Nagatoshi Fujiwara, Nobuo Okahashi, Hirotaka Kuwata
Oral streptococci including mitis group streptococci are commensal residents and are also the first to colonize the oral cavity. However, various species of these oral streptococci have the potential to invade the host and occasionally lead to severe infectious disease such as cardiovascular diseases. Oral streptococci have close interactions with the host immune system including macrophages at the oral mucosal surface. One notable common trait of oral streptococcus including Streptococcus oralis (S. oralis) is the production of hydrogen peroxide (H2O2)...
April 1, 2017: Biochemical and Biophysical Research Communications
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