keyword
MENU ▼
Read by QxMD icon Read
search

invasive group a streptococcus

keyword
https://www.readbyqxmd.com/read/28830075/streptococcal-heme-binding-protein-shp-promotes-virulence-and-contributes-to-the-pathogenesis-of-group-a-streptococcus-infection
#1
Xiaolan Zhang, Chunmei Lu, Fengmin Zhang, Yingli Song, Minghui Cai, Hui Zhu
Streptococcal heme binding protein (Shp) is involved in the process of heme acquisition in group A Streptococcus (GAS). However, no research thus far has examined the contribution of Shp to the virulence of GAS. To this end, we generated an isogenic strain lacking the shp gene (Δshp) and its complemented strain (Δshp-c) using the parent strain MGAS5005 (WT). Deletion of shp increased survival rates and neutrophil recruitment and reduced skin lesion sizes and GAS loads in the blood and the liver, lung, kidney and spleen in subcutaneous infections of mice...
September 29, 2017: Pathogens and Disease
https://www.readbyqxmd.com/read/28817704/analysis-of-multidrug-resistant-group-b-streptococci-with-reduced-penicillin-susceptibility-forming-small-less-hemolytic-colonies
#2
Hirotsugu Banno, Kouji Kimura, Yosuke Tanaka, Tsuyoshi Sekizuka, Makoto Kuroda, Wanchun Jin, Jun-Ichi Wachino, Keiko Yamada, Keigo Shibayama, Yoshichika Arakawa
Group B streptococci (GBS; Streptococcus agalactiae) are the leading cause of neonatal invasive diseases and are also important pathogens for elderly adults. Until now, nearly all GBS with reduced penicillin susceptibility (PRGBS) have shown β-hemolytic activity and grow on sheep blood agar. However, we have previously reported three PRGBS clinical isolates harboring a CylK deletion that form small less hemolytic colonies. In this study, we examined the causes of small, less hemolytic colony formation in these clinical isolates...
2017: PloS One
https://www.readbyqxmd.com/read/28814408/intrinsic-maturational-neonatal-immune-deficiencies-and-susceptibility-to-group-b-streptococcus-infection
#3
REVIEW
Michelle L Korir, Shannon D Manning, H Dele Davies
Although a normal member of the gastrointestinal and vaginal microbiota, group B Streptococcus (GBS) can also occasionally be the cause of highly invasive neonatal disease and is an emerging pathogen in both elderly and immunocompromised adults. Neonatal GBS infections are typically transmitted from mother to baby either in utero or during passage through the birth canal and can lead to pneumonia, sepsis, and meningitis within the first few months of life. Compared to the adult immune system, the neonatal immune system has a number of deficiencies, making neonates more susceptible to infection...
October 2017: Clinical Microbiology Reviews
https://www.readbyqxmd.com/read/28808155/roca-is-an-accessory-protein-to-the-virulence-regulating-covr-s-two-component-system-in-the-group-a-streptococcus
#4
Ira Jain, Eric W Miller, Jessica L Danger, Kathryn J Pflughoeft, Paul Sumby
Regulating gene expression during infection is critical to the ability of pathogens to circumvent the immune response and cause disease. This is true for the group A Streptococcus (GAS), a pathogen that causes both invasive (e.g. necrotizing fasciitis) and non-invasive (e.g. pharyngitis) diseases. The control of virulence (CovR/S) two-component system has a major role in regulating GAS virulence factor expression. The regulator of cov (RocA) protein, which is a predicted kinase, functions in an undetermined manner through CovR/S to alter gene expression and reduce invasive disease virulence...
August 14, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28807000/necrotizing-streptococcal-myositis-of-the-upper-extremity-a-case-report
#5
Johannes C Reichert, Götz Habild, Paul Simon, Ulrich Nöth, Jan B Krümpelmann
BACKGROUND: Necrotizing myositis is a rare but life-threatening soft-tissue infection characterized by rapidly spreading inflammation and subsequent necrosis of the affected tissue. The myositis is often caused by toxin-producing, virulent bacteria such as group A β-hemolytic streptococcus and associated with severe systemic toxicity. It is rapidly fatal unless diagnosed promptly and treated aggressively. However, necrotizing myositis is often initially misdiagnosed as a more benign soft-tissue infection as such fulminant, invasive muscle infections are rare with no more than 30 cases reported over the last century...
August 15, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/28805176/estimating-the-risk-of-invasive-group-a-streptococcus-infection-in-care-home-residents-in-england-2009-2010
#6
M Saavedra-Campos, B Simone, S Balasegaram, A Wright, M Usdin, T Lamagni
Invasive group A streptococcal (iGAS) infections cause severe disease and death, especially in residents of long-term care facilities (LTCFs). In order to inform iGAS prevention, we compared the risk of iGAS in LTCF residents and community residents. We identified LTCF residents among cases of iGAS from national surveillance (2009-2010) using postcode matching, and cases of hospital-acquired infections via hospital admission records. We used Poisson regression to calculate incidence rate ratios (IRR) and logistic regression to explore factors associated with case fatality rate (CFR)...
August 14, 2017: Epidemiology and Infection
https://www.readbyqxmd.com/read/28783696/il-1%C3%AE-is-an-innate-immune-sensor-of-microbial-proteolysis
#7
Christopher N LaRock, Jordan Todd, Doris L LaRock, Joshua Olson, Anthony J O'Donoghue, Avril A B Robertson, Matthew A Cooper, Hal M Hoffman, Victor Nizet
Interleukin-1β (IL-1β) is a key proinflammatory cytokine that drives antimicrobial immune responses. IL-1β is aberrantly activated in autoimmune diseases, and IL-1β inhibitors are used as therapeutic agents to treat patients with certain autoimmune disorders. Review of postmarketing surveillance of patients receiving IL-1β inhibitors found a disproportionate reporting of invasive infections by group A Streptococcus (GAS). IL-1β inhibition increased mouse susceptibility to GAS infection, but IL-1β was produced independent of canonical inflammasomes...
August 19, 2016: Science Immunology
https://www.readbyqxmd.com/read/28783687/group-b-streptococcus-circumvents-neutrophils-and-neutrophil-extracellular-traps-during-amniotic-cavity-invasion-and-preterm-labor
#8
Erica Boldenow, Claire Gendrin, Lisa Ngo, Craig Bierle, Jay Vornhagen, Michelle Coleman, Sean Merillat, Blair Armistead, Christopher Whidbey, Varchita Alishetti, Veronica Santana-Ufret, Jason Ogle, Michael Gough, Sengkeo Srinouanprachanh, James W MacDonald, Theo K Bammler, Aasthaa Bansal, H Denny Liggitt, Lakshmi Rajagopal, Kristina M Adams Waldorf
Preterm birth is a leading cause of neonatal morbidity and mortality. Although microbial invasion of the amniotic cavity (MIAC) is associated with most early preterm births, the temporal events that occur during MIAC and preterm labor are not known. Group B streptococci (GBS) are β-hemolytic, Gram-positive bacteria, which commonly colonize the vagina but have been recovered from the amniotic fluid in preterm birth cases. To understand temporal events that occur during MIAC, we used a chronically catheterized nonhuman primate model that closely emulates human pregnancy...
October 14, 2016: Science Immunology
https://www.readbyqxmd.com/read/28778116/caveolin-1-restricts-group-a-streptococcus-invasion-of-non-phagocytic-host-cells
#9
Jin Yan Lim, Timothy C Barnett, Michele Bastiani, Kerrie-Ann McMahon, Charles Ferguson, Richard I Webb, Robert G Parton, Mark J Walker
Caveolae are composed of two major proteins, caveolin-1 (CAV1) and cavin-1/polymerase transcript factor I (CAVIN1). Here we demonstrate that CAV1 levels modulate invasion of group A Streptococcus (GAS) into non-phagocytic mammalian cells. GAS showed enhanced internalization into CAV1 knockout mouse embryonic fibroblasts (MEFs), and CAV1 knockdown human epithelial HEp-2 cells, whereas over-expression of CAV1 in HEp-2 cells reduced GAS invasion. This effect was not dependent on the expression of the GAS fibronectin binding protein SfbI, which had previously been implicated in caveolae-mediated uptake...
August 4, 2017: Cellular Microbiology
https://www.readbyqxmd.com/read/28769806/a-red-blood-cell-membrane-camouflaged-nanoparticle-counteracts-streptolysin-o-mediated-virulence-phenotypes-of-invasive-group-a-streptococcus
#10
Tamara Escajadillo, Joshua Olson, Brian T Luk, Liangfang Zhang, Victor Nizet
Group A Streptococcus (GAS), an important human-specific Gram-positive bacterial pathogen, is associated with a broad spectrum of disease, ranging from mild superficial infections such as pharyngitis and impetigo, to serious invasive infections including necrotizing fasciitis and streptococcal toxic shock syndrome. The GAS pore-forming streptolysin O (SLO) is a well characterized virulence factor produced by nearly all GAS clinical isolates. High level expression of SLO is epidemiologically linked to intercontinental dissemination of hypervirulent clonotypes and poor clinical outcomes...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/28757019/genomic-comparison-of-virulent-and-non-virulent-serotype-v-st1-streptococcus-agalactiae-in-fish
#11
Rui Wang, Li-Ping Li, Ting Huang, Ai-Ying Lei, Yan Huang, Fu-Guang Luo, Dong-Ying Wang, Wei-Yi Huang, Ming Chen, Jun Huang
Streptococcus agalactiae or Group B Streptococcus (GBS) is the major pathogen causing pneumonia and meningitis in human, mastitis in dairy cows, and streptococcal disease in tilapia. Previous studies have shown that fish GBS strains are correlated with human GBS strains in evolution and might have cross-host infection ability. Although the invasive disease caused by ST1 GBS in non-pregnant adults and cows is increasing worldwide, infection of fish by ST1 GBS has not been reported. The aim of this study was to determine whether ST1 GBS was virulent in fish and to investigate the genomic characteristics of ST1 GBS strains with different pathogenicity in tilapia...
August 2017: Veterinary Microbiology
https://www.readbyqxmd.com/read/28750420/a-10-year-observational-study-of-streptococcus-dysgalactiae-bacteraemia-in-adults-frequent-occurrence-among-female-intravenous-drug-users
#12
Corinne Ruppen, Magnus Rasmussen, Carlo Casanova, Parham Sendi
Beta-haemolytic streptococci of groups C and G have become increasingly recognized as causes of invasive human infections. We reviewed clinical and molecular characteristics of Streptococcus dysgalactiae isolates that caused bacteraemia in adults from 2006 to 2015. Among 67 episodes, skin and soft-tissue infections (43%) and emm types stG62647.0 (26%) were the most frequent clinical manifestation and emm type, respectively. Nineteen (28%) episodes occurred in intravenous drug users (75% women). Our observational study shows similarities to but also differences from other reports...
July 27, 2017: Swiss Medical Weekly
https://www.readbyqxmd.com/read/28736993/molecular-characterization-of-streptococcus-pneumoniae-particularly-serotype19a-st320-that-emerged-in-krasnoyarsk-russia
#13
Irina N Protasova, Tsai-Wen Wan, Natalya V Bakhareva, Wei-Chun Hung, Wataru Higuchi, Yasuhisa Iwao, Tatyana A Yelistratova, Natalya A Ilyenkova, Yelena S Sokolovskaya, Galina P Martynova, Ivan V Reva, Galina V Reva, Sergey V Sidorenko, Lee-Jene Teng, Olga V Peryanova, Alla B Salmina, Tatsuo Yamamoto
Streptococcus pneumoniae, a common human pathogen, colonizes the nasopharynx and causes diseases including acute otitis media (AOM). We herein report pneumococcal serotype distributions in children before and after PCV7 vaccination and in patients with pneumococcal disease in Siberian Russia (Krasnoyarsk). Analyses included antimicrobial susceptibility testing, ST typing, a pulsed-field gel electrophoresis analysis, virulence-related surface protein gene (VSG) typing with novel primers, and a structural analysis by scanning electron microscopy...
July 23, 2017: Microbiology and Immunology
https://www.readbyqxmd.com/read/28736198/characterization-of-streptococcus-pneumoniae-invasive-serotype-19a-isolates-from-argentina-1993-2014
#14
Paula Gagetti, Diego Faccone, Vanesa Reijtman, Sofia Fossati, Marisa Rodriguez, Omar Veliz, Paola Ceriana, Mabel Regueira, Alejandra Corso
The aim of this study was to characterize Streptococcus pneumoniae serotype 19A isolates causing invasive pneumococcal disease in children, collected in Argentina between 1993 and 2014. A total of 176 isolates serotype 19A were analyzed. There was an increase in the proportion of serotype 19A isolates from 3% in 1993 to 6% in 2011, prior to the introduction of PCV13 in 2012, and from 2012 to 2014 its proportion gradually decreased. Penicillin resistance among serotype 19A isolates throughout the study period was 65...
July 20, 2017: Vaccine
https://www.readbyqxmd.com/read/28725562/pleural-empyema-and-streptococcal-toxic-shock-syndrome-due-to-streptococcus-pyogenes-in-a-healthy-spanish-traveler-in-japan
#15
Tetsuya Sakai, Daisuke Taniyama, Saeko Takahashi, Morio Nakamura, Takashi Takahashi
Group A Streptococcus (GAS, Streptococcus pyogenes) causes invasive infections including streptococcal toxic shock syndrome (STSS) and local infections. To our knowledge, this is the first report of a case of an invasive GAS infection with pneumonia and pleural empyema (PE) followed by STSS (disseminated intravascular coagulation [DIC] and acute renal insufficiency) in a healthy male adult. He received combined supportive therapies of PE drainage, anti-DIC agent, hemodialysis, and antimicrobials and eventually made a clinical recovery...
2017: IDCases
https://www.readbyqxmd.com/read/28720729/inhibition-of-inflammasome-dependent-interleukin-1%C3%AE-production-by-streptococcal-nad-glycohydrolase-evidence-for-extracellular-activity
#16
Dóra Hancz, Elsa Westerlund, Benedicte Bastiat-Sempe, Onkar Sharma, Christine Valfridsson, Lena Meyer, John F Love, Maghnus O'Seaghdha, Michael R Wessels, Jenny J Persson
Group A Streptococcus (GAS) is a common human pathogen and the etiologic agent of a large number of diseases ranging from mild, self-limiting infections to invasive life-threatening conditions. Two prominent virulence factors of this bacterium are the genetically and functionally linked pore-forming toxin streptolysin O (SLO) and its cotoxin NAD(+)-glycohydrolase (NADase). Overexpression of these toxins has been linked to increased bacterial virulence and is correlated with invasive GAS disease. NADase can be translocated into host cells by a SLO-dependent mechanism, and cytosolic NADase has been assigned multiple properties such as protection of intracellularly located GAS bacteria and induction of host cell death through energy depletion...
July 18, 2017: MBio
https://www.readbyqxmd.com/read/28712490/pneumococcal-vaccination-for-splenectomized-patients-with-thalassemia-major-in-indonesia
#17
Teny Tjitra Sari, Arwin Ali P Akib, Djajadiman Gatot, Alida Roswita Harahap, Saptawati Bardosono, Sri Rezeki S Hadinegoro
INTRODUCTION: Streptococcus pneumoniae is a capsulated bacterium that can cause severe infection in patients with thalassemia major, particularly those who have undergone splenectomy. The absence of the spleen as well as zinc deficiency in splenectomized patients with thalassemia major increases the possibility of developing invasive pneumococcal infection. The aims of this study are to evaluate pneumococcal IgG levels following PCV and PPV immunizations and the effect of zinc supplementation on qualitative specific immune responses in splenectomized patients with thalassemia...
July 13, 2017: Vaccine
https://www.readbyqxmd.com/read/28705427/invasive-disease-by-streptococcus-pyogenes-patients-hospitalized-for-6-years
#18
Vanessa Arias-Constantí, Victoria Trenchs-Sainz de la Maza, Nuria Elvira Sanz-Marcos, Carmina Guitart-Pardellans, Amadeu Gené-Giralt, Carles Luaces-Cubells
INTRODUCTION AND OBJECTIVE: The last years an increase of severe cases of invasive disease (ID) due to Streptococcus pyogenes or streptococcus b-hemolytic group A (SGA) had been detected. The aim of this study was to analyze the epidemiology and the clinical features of ID due to SGA in a tertiary Pediatric Hospital. MATERIAL AND METHODS: Retrospective study in a Pediatric hospital, of all in-patients with final diagnosis of ID due to SGA during 6 years (2009-2014)...
July 10, 2017: Enfermedades Infecciosas y Microbiología Clínica
https://www.readbyqxmd.com/read/28705211/streptococcal-toxic-shock-syndrome-due-to-streptococcus-dysgalactiae-subspecies-equisimilis-in-breast-cancer-related-lymphedema-a-case-report
#19
Makoto Sumazaki, Fumi Saito, Hideaki Ogata, Miho Yoshida, Yorichika Kubota, Syunsuke Magoshi, Hironori Kaneko
BACKGROUND: Breast cancer-related lymphedema often causes cellulitis and is one of the most common complications after breast cancer surgery. Streptococci are the major pathogens underlying such cellulitis. Among the streptococci, the importance of the Lancefield groups C and G is underappreciated; most cases involve Streptococcus dysgalactiae subspecies equisimilis. Despite having a relatively weak toxicity compared with group A streptococci, Streptococcus dysgalactiae subspecies equisimilis is associated with a mortality rate that is as high as that of group A streptococci in cases of invasive infection because Streptococcus dysgalactiae subspecies equisimilis mainly affects elderly individuals who already have various comorbidities...
July 14, 2017: Journal of Medical Case Reports
https://www.readbyqxmd.com/read/28696530/immunogenicity-and-safety-of-single-dose-13-valent-pneumococcal-conjugate-vaccine-in-pediatric-and-adolescent-oncology-patients
#20
Te-Yu Hung, Rishi S Kotecha, Christopher C Blyth, Sarah K Steed, Ruth B Thornton, Anne L Ryan, Catherine H Cole, Peter C Richmond
BACKGROUND: Children receiving immunosuppressive treatment for cancer are at high risk for invasive pneumococcal disease. The 13-valent pneumococcal conjugate vaccine (PCV13) can prevent pneumococcal disease in healthy children; however, there is an absence of literature regarding the benefit of PCV13 in immunocompromised children with cancer. METHODS: A prospective, open-label cohort study recruited children between ages 1 and 18 years who were receiving active immunosuppressive therapy (AIT) or were within 12 months after completing immunosuppressive therapy (CIT)...
July 11, 2017: Cancer
keyword
keyword
75194
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"