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invasive group a streptococcus

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https://www.readbyqxmd.com/read/29226710/group-a-streptococcus-encounters-with-host-macrophages
#1
J Andrés Valderrama, Victor Nizet
Group A Streptococcus (GAS) is a leading human bacterial pathogen with diverse clinical manifestations. Macrophages constitute a critical first line of host defense against GAS infection, using numerous surface and intracellular receptors such as Toll-like receptors and inflammasomes for pathogen recognition and activation of inflammatory signaling pathways. Depending on the intensity of the GAS infection, activation of these signaling cascades may provide a beneficial early alarm for effective immune clearance, or conversely, may cause hyperinflammation and tissue injury during severe invasive infection...
December 11, 2017: Future Microbiology
https://www.readbyqxmd.com/read/29209311/codevelopment-of-microbiota-and-innate-immunity-and-the-risk-for-group-b-streptococcal-disease
#2
REVIEW
Julia Kolter, Philipp Henneke
The pathogenesis of neonatal late-onset sepsis (LOD), which manifests between the third day and the third month of life, remains poorly understood. Group B Streptococcus (GBS) is the most important cause of LOD in infants without underlying diseases or prematurity and the third most frequent cause of meningitis in the Western world. On the other hand, GBS is a common intestinal colonizer in infants. Accordingly, despite its adaption to the human lower gastrointestinal tract, GBS has retained its potential virulence and its transition from a commensal to a dangerous pathogen is unpredictable in the individual...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/29184151/association-between-antibodies-against-group-b-streptococcus-surface-proteins-and-recto-vaginal-colonisation-during-pregnancy
#3
Sonwabile Dzanibe, Gaurav Kwatra, Peter V Adrian, Sheila Z Kimaro-Mlacha, Clare L Cutland, Shabir A Madhi
Group B Streptococcus (GBS) recto-vaginal colonisation in pregnant women is the major risk factor for early-onset invasive GBS disease in their newborns. We aimed to determine the association between serum antibody levels against 11 GBS surface proteins and recto-vaginal acquisition of GBS colonisation during pregnancy. Sera collected from pregnant women at 20-25 weeks and ≥37 weeks of gestation age were measured for IgG titres against GBS surface proteins using  a multiplex immunoassay. Women were evaluated for recto-vaginal colonisation every 4-5 weeks...
November 28, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29181956/infectious-diseases-in-poland-in-2015
#4
Małgorzata Sadkowska-Todys, Andrzej Zieliński, Mirosław P. Czarkowski
PURPOSE OF THE STUDY: This is the next annual analysis of the situation of infectious and parasitic diseases in Poland in 2015 within the framework of the Epidemiological Chronicle of Przegląd Epidemiologiczny - Epidemiological Review. Its purpose is to identify potential threats to the health of populations from infectious diseases occurring in Poland with reference to other parts of the globe. MATERIAL AND METHODS: This paper is an introduction to more detailed studies of the epidemiological situation of selected infectious diseases and summarizes the results of the surveillance of infectious diseases in Poland in 2015...
2017: Przegla̧d Epidemiologiczny
https://www.readbyqxmd.com/read/29160197/isolation-and-molecular-characterization-of-group-b-streptococcus-from-laboratory-long-evans-rats-rattus-norvegicus-with-and-without-invasive-group-b-streptococcal-disease
#5
Caroline Bodi Winn, Vasudevan Bakthavatchalu, Michael Y Esmail, Yan Feng, JoAnn Dzink-Fox, Lauren Richey, Scott E Perkins, Eric K Nordberg, James G Fox
PURPOSE: Group B Streptococcus (S. agalactiae, GBS) is a Gram-positive opportunistic pathogen that inhabits the respiratory, urogenital and gastrointestinal tracts of humans and animals. Maternal colonization of GBS is a risk factor for a spectrum of clinical diseases in humans and a principle cause of neonatal meningitis and septicaemia. METHODOLOGY: We describe polymicrobial sepsis including GBS in two gravid adult female Long-Evans rats experiencing acute mortality from a colony of long-term breeding pairs...
November 21, 2017: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/29158432/identification-and-characterization-of-serotype-specific-variation-in-group-a-streptococcus-pilus-expression
#6
Gregory Calfee, Jessica L Danger, Ira Jain, Eric W Miller, Poulomee Sarkar, Brian Tjaden, Bernd Kreikemeyer, Paul Sumby
Isolates of a given bacterial pathogen often display phenotypic variation, and this can negatively impact public health, for example by reducing the efficacy of preventative measures. Here, we identify that the human pathogen group A Streptococcus (GAS; Streptococcus pyogenes) expresses pili on its cell surface in a serotype-specific manner. Specifically, we show that serotype M3 GAS isolates, which are non-randomly associated with causing particularly severe and lethal invasive infections, produce negligible amounts of pili relative to serotype M1 and M49 isolates...
November 20, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/29117332/estimates-of-the-burden-of-group-b-streptococcal-disease-worldwide-for-pregnant-women-stillbirths-and-children
#7
Anna C Seale, Fiorella Bianchi-Jassir, Neal J Russell, Maya Kohli-Lynch, Cally J Tann, Jenny Hall, Lola Madrid, Hannah Blencowe, Simon Cousens, Carol J Baker, Linda Bartlett, Clare Cutland, Michael G Gravett, Paul T Heath, Margaret Ip, Kirsty Le Doare, Shabir A Madhi, Craig E Rubens, Samir K Saha, Stephanie J Schrag, Ajoke Sobanjo-Ter Meulen, Johan Vekemans, Joy E Lawn
Background: We aimed to provide the first comprehensive estimates of the burden of group B Streptococcus (GBS), including invasive disease in pregnant and postpartum women, fetal infection/stillbirth, and infants. Intrapartum antibiotic prophylaxis is the current mainstay of prevention, reducing early-onset infant disease in high-income contexts. Maternal GBS vaccines are in development. Methods: For 2015 live births, we used a compartmental model to estimate (1) exposure to maternal GBS colonization, (2) cases of infant invasive GBS disease, (3) deaths, and (4) disabilities...
November 6, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/29117328/maternal-disease-with-group-b-streptococcus-and-serotype-distribution-worldwide-systematic-review-and-meta-analyses
#8
Jennifer Hall, Nadine Hack Adams, Linda Bartlett, Anna C Seale, Theresa Lamagni, Fiorella Bianchi-Jassir, Joy E Lawn, Carol J Baker, Clare Cutland, Paul T Heath, Margaret Ip, Kirsty Le Doare, Shabir A Madhi, Craig E Rubens, Samir K Saha, Stephanie Schrag, Ajoke Sobanjo-Ter Meulen, Johan Vekemans, Michael G Gravett
Background: Infections such as group B Streptococcus (GBS) are an important cause of maternal sepsis, yet limited data on epidemiology exist. This article, the third of 11, estimates the incidence of maternal GBS disease worldwide. Methods: We conducted systematic literature reviews (PubMed/Medline, Embase, Latin American and Caribbean Health Sciences Literature [LILACS], World Health Organization Library Information System [WHOLIS], and Scopus) and sought unpublished data on invasive GBS disease in women pregnant or within 42 days postpartum...
November 6, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/29117327/maternal-colonization-with-group-b-streptococcus-and-serotype-distribution-worldwide-systematic-review-and-meta-analyses
#9
Neal J Russell, Anna C Seale, Megan O'Driscoll, Catherine O'Sullivan, Fiorella Bianchi-Jassir, Juan Gonzalez-Guarin, Joy E Lawn, Carol J Baker, Linda Bartlett, Clare Cutland, Michael G Gravett, Paul T Heath, Kirsty Le Doare, Shabir A Madhi, Craig E Rubens, Stephanie Schrag, Ajoke Sobanjo-Ter Meulen, Johan Vekemans, Samir K Saha, Margaret Ip
Background: Maternal rectovaginal colonization with group B Streptococcus (GBS) is the most common pathway for GBS disease in mother, fetus, and newborn. This article, the second in a series estimating the burden of GBS, aims to determine the prevalence and serotype distribution of GBS colonizing pregnant women worldwide. Methods: We conducted systematic literature reviews (PubMed/Medline, Embase, Latin American and Caribbean Health Sciences Literature [LILACS], World Health Organization Library Information System [WHOLIS], and Scopus), organized Chinese language searches, and sought unpublished data from investigator groups...
November 6, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/29117326/infant-group-b-streptococcal-disease-incidence-and-serotypes-worldwide-systematic-review-and-meta-analyses
#10
Lola Madrid, Anna C Seale, Maya Kohli-Lynch, Karen M Edmond, Joy E Lawn, Paul T Heath, Shabir A Madhi, Carol J Baker, Linda Bartlett, Clare Cutland, Michael G Gravett, Margaret Ip, Kirsty Le Doare, Craig E Rubens, Samir K Saha, Ajoke Sobanjo-Ter Meulen, Johan Vekemans, Stephanie Schrag
Background: Group B Streptococcus (GBS) remains a leading cause of neonatal sepsis in high-income contexts, despite declines due to intrapartum antibiotic prophylaxis (IAP). Recent evidence suggests higher incidence in Africa, where IAP is rare. We investigated the global incidence of infant invasive GBS disease and the associated serotypes, updating previous estimates. Methods: We conducted systematic literature reviews (PubMed/Medline, Embase, Latin American and Caribbean Health Sciences Literature [LILACS], World Health Organization Library Information System [WHOLIS], and Scopus) and sought unpublished data regarding invasive GBS disease in infants aged 0-89 days...
November 6, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/29111412/serotype-distribution-and-antibiotic-susceptibility-of-streptococcus-pneumoniae-strains-in-the-south-of-tunisia-a-five-year-study-2012-2016-of-pediatric-and-adult-populations
#11
Sonia Ktari, Ikram Jmal, Manel Mroua, Sonda Maalej, Nour ElHouda Ben Ayed, Basma Mnif, Faouzia Rhimi, Adnene Hammami
OBJECTIVES: To analyze the serotype distribution of Streptococcus pneumoniae clinical isolates collected in the south of Tunisia over a 5-year period in different age groups and to assess their antimicrobial susceptibility patterns. METHODS: A total of 305 non-duplicate S. pneumoniae isolates were collected between January 2012 and December 2016 at the university hospital in Sfax, Tunisia. All isolates were serotyped by multiplex PCR. The antibiotic susceptibility of all isolates was determined using the disk diffusion test or Etest assay...
October 27, 2017: International Journal of Infectious Diseases: IJID
https://www.readbyqxmd.com/read/29109702/genomic-comparison-among-lethal-invasive-strains-of-streptococcus-pyogenes-serotype-m1
#12
Gabriel R Fernandes, Aulus E A D Barbosa, Renan N Almeida, Fabíola F Dos S Castro, Marina de C P da Ponte, Celio Faria-Junior, Fernanda M P Müller, Antônio A B Viana, Dario Grattapaglia, Octavio L Franco, Sérgio A Alencar, Simoni C Dias
Streptococcus pyogenes, also known as group A Streptococcus (GAS), is a human pathogen that causes diverse human diseases including streptococcal toxic shock syndrome (STSS). A GAS outbreak occurred in Brasilia, Brazil, during the second half of the year 2011, causing 26 deaths. Whole genome sequencing was performed using Illumina platform. The sequences were assembled and genes were predicted for comparative analysis with emm type 1 strains: MGAS5005 and M1 GAS. Genomics comparison revealed one of the invasive strains that differ from others isolates and from emm 1 reference genomes...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29109175/the-streptococcus-agalactiae-stringent-response-enhances-virulence-and-persistence-in-human-blood
#13
Thomas A Hooven, Andrew J Catomeris, Maryam Bonakdar, Luke J Tallon, Ivette Santana-Cruz, Sandra Ott, Sean C Daugherty, Hervé Tettelin, Adam J Ratner
Streptococcus agalactiae (group B Streptococcus, GBS) causes serious infection in neonates. We previously reported a Tn-seq system for performing genome-wide assessment of gene fitness in GBS. In order to identify molecular mechanisms required for GBS to transition from a mucosal commensal lifestyle to bloodstream invasion, we performed Tn-seq on GBS coincubated with human whole blood. Our analysis identified 16 genes conditionally essential for GBS survival in blood, of which 75% were members of the capsular polysaccharide (cps) operon...
November 6, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/29107650/molecular-characterization-and-antibiotic-resistance-of-streptococcus-dysgalactiae-subspecies-equisimilis-isolated-from-patients-with-streptococcal-toxic-shock-syndrome
#14
T Ikebe, R Okuno, M Sasaki, Y Kanda, H Otsuka, R Kawahara, H Ohya, M Suzuki, K Uchida, H Nihonmatsu, M Ohnishi
Streptococcal toxic shock syndrome (STSS) is a severe invasive infection characterized by the sudden onset of shock, multiorgan failure, and high mortality. Although STSS is mainly caused by Streptococcus pyogenes, group G streptococcus identified as S. dysgalactiae subsp. equisimilis (SDSE) causing STSS has also been reported; however, no study has analyzed >100 isolates of SDSE causing STSS. Therefore, we characterized the emm genotype of 173 SDSE isolates obtained from STSS patients in Japan during 2014-2016 and performed antimicrobial susceptibility testing using the broth microdilution method and emm gene typing...
October 26, 2017: Journal of Infection and Chemotherapy: Official Journal of the Japan Society of Chemotherapy
https://www.readbyqxmd.com/read/29107417/osteoarticular-and-skin-and-soft-tissue-infections-caused-by-streptococcus-agalactiae-in-elderly-patients-are-frequently-associated-with-bacteremia
#15
Corinne Ruppen, Julia Notter, Carol Strahm, Beat Sonderegger, Parham Sendi
Older persons (≥65 years) are at risk for invasive group B streptococcal (GBS) infections. The most frequent clinical syndromes in 174 infection episodes were osteoarticular (40%) and skin and soft-tissue infections (30%). In 36% of episodes, a companion microorganism was isolated, and in 45%, blood culture results were positive. Antibiotics were streamlined after species identification in 29% of monomicrobial infections. These findings have clinical and therapeutic implications for GBS infections in the elderly...
September 19, 2017: Diagnostic Microbiology and Infectious Disease
https://www.readbyqxmd.com/read/29106586/immunization-with-a-latch-peptide-provides-serotype-independent-protection-against-group-b-streptococcus-infection-in-mice
#16
Shun-Mei Lin, A-Yeung Jang, Yong Zhi, Shuang Gao, Sangyong Lim, Jae Hyang Lim, Joon Young Song, Paul M Sullam, Joon Heang Rhee, Ho Seong Seo
Streptococcus agalactiae (Group B streptococcus, GBS) is a leading cause of neonatal invasive diseases as well as of severe infections in the elderly. The GBS serine rich repeat glycoprotein, Srr1, acts as a critical virulent factor by facilitating GBS invasion into the central nervous system through interaction with the fibrinogen A chain. In this study, we found that Srr1 is highly conserved in GBS clinical isolates (86.7%). Following immunization with different Srr1 truncated peptides, we demonstrated that only mice immunized with Srr1 truncates containing the latch domain were protected against GBS meningitis...
November 2, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/29100794/serotype-distribution-and-clinical-correlation-of-streptococcus-agalactiae-causing-invasive-disease-in-infants-and-children-in-taiwan
#17
Chiao-Wei Lo, Hao-Chuan Liu, Chien-Chung Lee, Chia-Ling Lin, Chyi-Liang Chen, Mei-Jy Jeng, Cheng-Hsun Chiu
BACKGROUND: Streptococcus agalactiae, or group B Streptococcus (GBS), remains to be one of the leading pathogens causing invasive infections in infants. METHODS: The clinical GBS isolates from sterile sites of patients younger than 18 years old were collected from October 1998 to December 2014 in two hospitals in Taiwan. Medical records were retrospectively reviewed. Every isolate was serotyped with a multiplex PCR assay. Multilocus sequence typing (MLST) was performed in representative isolates of different serotypes...
October 24, 2017: Journal of Microbiology, Immunology, and Infection, Wei Mian Yu Gan Ran za Zhi
https://www.readbyqxmd.com/read/29071076/burden-of-bacterial-upper-respiratory-tract-pathogens-in-school-children-of-nepal
#18
Sangita Thapa, Shishir Gokhale, Annavarapu Laxminarasimha Sharma, Lokendra Bahadur Sapkota, Shamshul Ansari, Rajendra Gautam, Sony Shrestha, Puja Neopane
INTRODUCTION: Respiratory tract infections are one of the most common human infections in all age group and important cause of mortality and morbidity worldwide. Most bacterial upper respiratory tract infections are vaccine preventable. This study aimed to determine the prevalence of carrier state of bacterial upper respiratory tract pathogens among school children. It also aimed to study their antibiograms. METHODS: The specimen from posterior pharyngeal wall and tonsils were collected from 204 participants on calcium alginate coated swabs (HiMedia)...
2017: BMJ Open Respiratory Research
https://www.readbyqxmd.com/read/29069346/outbreak-of-invasive-infections-from-subtype-emm26-3-group-a-streptococcus-among-homeless-adults-anchorage-alaska-2016-2017
#19
Emily Mosites, Anna Frick, Prabhu Gounder, Louisa Castrodale, Yuan Li, Karen Rudolph, Debby Hurlburt, Kristen D Lecy, Tammy Zulz, Tolu Adebanjo, Jennifer Onukwube, Bernard Beall, Chris A Van Beneden, Thomas Hennessy, Joseph McLaughlin, Bruce Michael
Background: In 2016, we detected an outbreak of group A Streptococcus (GAS) invasive infections among the estimated 1000 persons experiencing homelessness (PEH) in Anchorage, Alaska. We characterized the outbreak and implemented a mass antibiotic intervention at homeless service facilities. Methods: We identified cases through the Alaska GAS laboratory-based surveillance system. We conducted emm-typing, antimicrobial susceptibility testing, and whole genome sequencing (WGS) on all invasive isolates and compared medical record data of patients infected with emm26...
October 23, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/29034376/exploring-the-pregnant-guinea-pig-as-a-model-for-group-b-streptococcus-intrauterine-infection
#20
Maria I Harrell, Kellie Burnside, Christopher Whidbey, Jay Vornhagen, Kristina M Adams Waldorf, Lakshmi Rajagopal
Infection of the amniotic cavity remains a major cause of preterm birth, stillbirth, fetal injury and early onset, fulminant infections in newborns. Currently, there are no effective therapies to prevent in utero infection and consequent co-morbidities. This is in part due to the lack of feasible and appropriate animal models to understand mechanisms that lead to in utero infections. Use of mouse and rat models do not fully recapitulate human pregnancy, while pregnant nonhuman primate models are limited by ethical considerations, technical constraints, and cost...
September 2017: Journal of Infectious Diseases and Medicine
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