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invasive group a streptococcus

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https://www.readbyqxmd.com/read/28628457/clonal-clusters-and-virulence-factors-of-group-c-and-g-streptococcus-causing-severe-infections-manitoba-canada-2012-2014
#1
Sylvain A Lother, Walter Demczuk, Irene Martin, Michael Mulvey, Brenden Dufault, Philippe Lagacé-Wiens, Yoav Keynan
The incidence of group C and G Streptococcus (GCGS) bacteremia, which is associated with severe disease and death, is increasing. We characterized clinical features, outcomes, and genetic determinants of GCGS bacteremia for 89 patients in Winnipeg, Manitoba, Canada, who had GCGS bacteremia during 2012-2014. Of the 89 patients, 51% had bacteremia from skin and soft tissue, 70% had severe disease features, and 20% died. Whole-genome sequencing analysis was performed on isolates derived from 89 blood samples and 33 respiratory sample controls: 5 closely related genetic lineages were identified as being more likely to cause invasive disease than non-clade isolates (83% vs...
July 2017: Emerging Infectious Diseases
https://www.readbyqxmd.com/read/28612153/streptococcus-pneumoniae-antimicrobial-resistance-decreased-in-the-helsinki-metropolitan-area-after-routine-10-valent-pneumococcal-conjugate-vaccination-of-infants-in-finland
#2
R Sihvonen, L Siira, M Toropainen, P Kuusela, A Pätäri-Sampo
Since the introduction of 10-valent pneumococcal conjugate vaccine (PCV10) into the Finnish national vaccination program in September 2010, the incidence of invasive pneumococcal disease in children has decreased steeply in Finland. We studied the antimicrobial susceptibility of invasive and non-invasive Streptococcus pneumoniae (pneumococcus) isolated in the Helsinki Metropolitan Area during 2009-2014. We divided the data into two age groups: isolates from patients <5 years old and ≥5 years old. We also studied the serotype distribution of invasive isolates and of a subset of non-invasive multidrug-resistant isolates...
June 13, 2017: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/28571573/comparison-of-molecular-serotyping-approaches-of-streptococcus-agalactiae-from-genomic-sequences
#3
Georgia Kapatai, Darshana Patel, Androulla Efstratiou, Victoria J Chalker
BACKGROUND: Group B streptococcus (GBS) capsular polysaccharide is one of the major virulence factors underlying invasive GBS disease and a component of forthcoming vaccines. Serotype classification of GBS is based on the capsule polysaccharide of which ten variants are known to exist (Ia, Ib, II-IX). Current methods for GBS serotype assignment rely on latex agglutination or PCR while more recently a whole genome sequencing method was reported. In this study, three distinct algorithms for serotype assignment from genomic data were assessed using a panel of 790 clinical isolates...
June 1, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28570820/human-milk-oligosaccharides-exhibit-antimicrobial-and-anti-biofilm-properties-against-group-b-streptococcus
#4
Dorothy L Ackerman, Ryan S Doster, Jörn-Hendrik Weitkamp, David Aronoff, Jennifer A Gaddy, Steven D Townsend
Streptococcus agalactiae (Group B Streptococcus, GBS) is a Gram-positive bacterial pathogen that causes invasive infections of both children and adults. During pregnancy, GBS is a significant cause of infection of the fetal membranes (chorioamnionitis), which can lead to intra-amniotic infection, preterm birth, stillbirth, and neonatal sepsis. Recently, breastfeeding has been thought to represent a potential mode of GBS transmission from mother to newborn, which might increase the risk for late-onset sepsis...
June 1, 2017: ACS Infectious Diseases
https://www.readbyqxmd.com/read/28569141/disease-burden-and-antimicrobial-resistance-of-invasive-group-b-streptococcus-among-infants-in-china-a-protocol-for-a-national-prospective-observational-study
#5
Wenjing Ji, Haiying Liu, Zhengjiang Jin, Aimin Wang, Xiaoping Mu, Xiaosong Qin, Weidong Wang, Chunyan Gao, Yuning Zhu, Xiaodan Feng, Jine Lei, Shangyang She, Lan Jiang, Jing Liu, Shuhua Yang, Zeshi Liu, Gang Li, Qiuhong Li, Dawen Guo, Muhammad Majid Aziz, Ali Hassan Gillani, Yu Fang
BACKGROUND: Group B Streptococcus (GBS) is a cause of neonatal sepsis, pneumonia, and meningitis that can lead to neurological sequelae in infants less than 3 months of age. The GBS disease burden is not known in China, therefore it cannot receive major attention. The main objectives of this study are the evaluation of the incidence of neonatal GBS infection, GBS case-fatality ratio, its serotypes and genotypes, bacterial resistance, clinical treatment and outcomes in China. METHODS: We are conducting a nation-wide, population-based, multi-center, prospective, observational cohort study in China from May 2016 to December 2017...
May 31, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28537550/household-transmission-of-invasive-group-a-streptococcus-infections-in-england-a-population-based-study-2009-2011-to-2013
#6
Rachel Mearkle, Maria Saavedra-Campos, Theresa Lamagni, Martine Usdin, Juliana Coelho, Vicki Chalker, Shiranee Sriskandan, Rebecca Cordery, Chas Rawlings, Sooria Balasegaram
Invasive group A streptococcal infection has a 15% case fatality rate and a risk of secondary transmission. This retrospective study used two national data sources from England; enhanced surveillance (2009) and a case management system (2011-2013) to identify clusters of severe group A streptococcal disease. Twenty-four household pairs were identified. The median onset interval between cases was 2 days (range 0-28) with simultaneous onset in eight pairs. The attack rate during the 30 days after first exposure to a primary case was 4,520 per 100,000 person-years at risk (95% confidence interval (CI): 2,900-6,730) a 1,940 (95% CI: 1,240-2,880) fold elevation over the background incidence...
May 11, 2017: Euro Surveillance: Bulletin Européen sur les Maladies Transmissibles, European Communicable Disease Bulletin
https://www.readbyqxmd.com/read/28531208/phylogenetic-analysis-of-emergent-streptococcus-pneumoniae-serotype-22f-causing-invasive-pneumococcal-disease-using-whole-genome-sequencing
#7
Walter H B Demczuk, Irene Martin, Linda Hoang, Paul Van Caeseele, Brigitte Lefebvre, Greg Horsman, David Haldane, Jonathan Gubbay, Sam Ratnam, Gregory German, Jennifer Daley Bernier, Lori Strudwick, Allison McGeer, George G Zhanel, Gary Van Domselaar, Morag Graham, Michael R Mulvey
Since implementation of the 13-valent polyvalent conjugate vaccine (PCV13) in Canada during 2010, the proportion of PCV13 serotypes causing invasive pneumococcal disease (IPD) has declined from 55% (n = 1492) in 2010 to 31% (n = 764) in 2014. A concurrent increase of non-PCV13 serotypes has occurred and 22F has become the most prevalent serotype in Canada increasing from 7% (n = 183) to 11% (n = 283). Core single nucleotide variant phylogenetic analysis was performed on 137 Streptococcus pneumoniae serotype 22F isolates collected across Canada from 2005-2015...
2017: PloS One
https://www.readbyqxmd.com/read/28529115/pneumococcal-infection-in-patients-with-systemic-lupus-erythematosus
#8
Juliet Schurder, Tiphaine Goulenok, Romain Jouenne, Antoine Dossier, Damien Van Gysel, Thomas Papo, Karim Sacre
OBJECTIVE: Our study aimed to analyze the risk factors associated with the occurrence and severity of pneumococcal infection (PI) in systemic lupus erythematosus (SLE) patients. METHODS: Medical records of all SLE patients admitted in our department from January 2005 to December 2014 were retrospectively reviewed. SLE Patients were separated in 2 groups according to whether they had PI or not. Medical records of all consecutive patients (with and without SLE) admitted in our department for PI over the same period of time were also reviewed...
May 18, 2017: Joint, Bone, Spine: Revue du Rhumatisme
https://www.readbyqxmd.com/read/28520869/comparative-pathogenomic-characterization-of-a-non-invasive-serotype-m71-strain-streptococcus-pyogenes-ns53-reveals-incongruent-phenotypic-implications-from-distinct-genotypic-markers
#9
Yun-Juan Bao, Yang Li, Zhong Liang, Garima Agrahari, Shaun W Lee, Victoria A Ploplis, Francis J Castellino
The strains serotyped as M71 from group A Streptococcus are common causes of pharyngeal and skin diseases worldwide. Here we characterize the genome of a unique non-invasive M71 human isolate, NS53. The genome does not contain structural rearrangements or large-scale gene gains/losses, but encodes a full set of non-truncated known virulence factors, thus providing an ideal reference for comparative studies. However, the NS53 genome showed incongruent phenotypic implications from distinct genotypic markers. NS53 is characterized as an emm pattern D and FCT (fibronectin-collagen-T antigen) type-3 strain, typical of skin tropic strains, but is phylogenetically close to emm pattern E strains with preference for both skin and pharyngeal infections...
July 31, 2017: Pathogens and Disease
https://www.readbyqxmd.com/read/28515218/group-b-streptococcus-among-pregnant-women-and-newborns-in-mirzapur-bangladesh-colonization-vertical-transmission-and-serotype-distribution
#10
Samir K Saha, Zabed B Ahmed, Joyanta K Modak, Hakka Naziat, Shampa Saha, Mohammad A Uddin, Maksuda Islam, Abdullah H Baqui, Gary L Darmstadt, Stephanie J Schrag
Group B Streptococcus (GBS) infection is a leading cause of death in newborns in developed countries. Data on burden of GBS in Asian countries is lacking. This study aimed to understand i) rate of maternal recto-vaginal GBS carriage, ii) vertical transmission of GBS as determined by culturing ear, umbilicus and nasal swabs, and iii) distribution of GBS serotypes. This prospective observational study was conducted from September 2012 to November 2013 at Kumudini Hospital, a secondary level hospital, at Mirzapur, Bangladesh...
May 17, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28502330/three-decades-of-follow-up-of-adults-after-recovery-from-invasive-pneumococcal-pneumonia
#11
Oluwadamilare O Ajayi, Nancy B Norton, Todd W Gress, Ronald J Stanek, Maurice A Mufson
BACKGROUND: Streptococcus pneumoniae infection is the most common cause of community-acquired pneumonia in adults. Invasive pneumococcal disease (IPD) carries a high case fatality rate. We investigated the lifespan of adults who recovered from IPD during a 32-year follow-up. MATERIALS AND METHODS: We determined whether adults discharged after an episode of IPD from hospitals affiliated with the Marshall University Joan C. Edwards School of Medicine in Huntington, West Virginia from 1983-2003 were alive on June 30, 2014...
May 2017: American Journal of the Medical Sciences
https://www.readbyqxmd.com/read/28475781/2015-epidemic-of-severe-streptococcus-agalactiae-sequence-type-283-infections-in-singapore-associated-with-the-consumption-of-raw-freshwater-fish-a-detailed-analysis-of-clinical-epidemiological-and-bacterial-sequencing-data
#12
Shirin Kalimuddin, Swaine L Chen, Cindy T K Lim, Tse Hsien Koh, Thean Yen Tan, Michelle Kam, Christopher W Wong, Kurosh S Mehershahi, Man Ling Chau, Lee Ching Ng, Wen Ying Tang, Hishamuddin Badaruddin, Jeanette Teo, Anucha Apisarnthanarak, Nuntra Suwantarat, Margaret Ip, Matthew T G Holden, Li Yang Hsu, Timothy Barkham
Background: Streptococcus agalactiae (group B Streptococcus [GBS]) has not been described as a foodborne pathogen. However, in 2015, a large outbreak of severe invasive sequence type (ST) 283 GBS infections in adults epidemiologically linked to the consumption of raw freshwater fish occurred in Singapore. We attempted to determine the scale of the outbreak, define the clinical spectrum of disease, and link the outbreak to contaminated fish. Methods: Time-series analysis was performed on microbiology laboratory data...
May 15, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/28470020/rapid-emergence-of-a-new-clone-impacts-the-population-at-risk-and-increases-the-incidence-of-type-emm89-group-a-streptococcus-invasive-disease
#13
Sarah Teatero, Brenda L Coleman, Stephen B Beres, Randall J Olsen, Christopher Kandel, Olivia Reynolds, Taryn B T Athey, James M Musser, Allison McGeer, Nahuel Fittipaldi
BACKGROUND: Invasive group A Streptococcus (iGAS) disease caused by type emm89 strains has been increasing worldwide, driven by the emergence of an epidemic clonal variant (clade 3 emm89). The clinical characteristics of patients with emm89 iGAS disease, and in particular with clade 3 emm89 iGAS disease, are poorly described. METHODS: We used population-based iGAS surveillance data collected in metropolitan Toronto, Ontario, Canada during the period 2000-2014. We sequenced the genomes of 105 emm89 isolates representing all emm89 iGAS disease cases in the area during the period and 138 temporally matched emm89 iGAS isolates collected elsewhere in Ontario...
2017: Open Forum Infectious Diseases
https://www.readbyqxmd.com/read/28462035/whole-genome-sequencing-of-group-a-streptococcus-development-and-evaluation-of-an-automated-pipeline-for-emmgene-typing
#14
Georgia Kapatai, Juliana Coelho, Steven Platt, Victoria J Chalker
Streptococcus pyogenes group A Streptococcus (GAS) is the most common cause of bacterial throat infections, and can cause mild to severe skin and soft tissue infections, including impetigo, erysipelas, necrotizing fasciitis, as well as systemic and fatal infections including septicaemia and meningitis. Estimated annual incidence for invasive group A streptococcal infection (iGAS) in industrialised countries is approximately three per 100,000 per year. Typing is currently used in England and Wales to monitor bacterial strains of S...
2017: PeerJ
https://www.readbyqxmd.com/read/28459299/enhanced-nasopharyngeal-infection-and-shedding-associated-with-an-epidemic-lineage-of-emm3-group-a-streptococcus
#15
Baharak Afshar, Claire E Turner, Theresa L Lamagni, Ken C Smith, Ali Al-Shahib, Anthony Underwood, Matthew T G Holden, Androulla Efstratiou, Shiranee Sriskandan
BACKGROUND: A group A Streptococcus (GAS) lineage of genotype emm3, sequence type 15 (ST15) was associated with a 6 month upsurge in invasive GAS disease in the UK. The epidemic lineage (Lineage C) had lost 2 typical emm3 prophages, Φ315.1 and Φ315.2 associated with the superantigen ssa, but gained a different prophage (ΦUK-M3.1) associated with a different superantigen, speC and a DNAse spd1. METHODS AND RESULTS: The presence of speC and spd1 in Lineage C ST15 strains enhanced both in vitro mitogenic and DNase activities over non-Lineage C ST15 strains...
May 1, 2017: Virulence
https://www.readbyqxmd.com/read/28447173/clinical-and-microbiological-features-associated-with-group-b-streptococcus-bone-and-joint-infections-france-2004-2014
#16
S Kernéis, C Plainvert, J-P Barnier, A Tazi, N Dmytruk, B Gislain, J Loubinoux, F El Sayed, V Cattoir, N Desplaces, V Vernet, P Morand, C Poyart
This study describes the clinical and microbiological features associated with group B Streptococcus (GBS) bone and joint infections (BJIs). It was a retrospective analysis of adult cases of GBS BJIs reported to the French National Reference Center for Streptococci from January 2004 to December 2014. Clinical data and GBS molecular characteristics are reported. Strains were collected from 163 patients. The most frequent comorbidities were: solid organ cancer (n = 21, 21%) and diabetes mellitus (n = 20, 20%)...
April 26, 2017: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/28420662/outcome-of-a-screening-programme-for-the-prevention-of-neonatal-invasive-early-onset-group-b-streptococcus-infection-in-a-uk-maternity-unit-an-observational-study
#17
G Gopal Rao, G Nartey, T McAree, A O'Reilly, S Hiles, T Lee, S Wallace, R Batura, P Khanna, H Abbas, C Tilsed, R Nicholl, T Lamagni, P Bassett
BACKGROUND: Against a background of failure to prevent neonatal invasive early-onset group B Streptococcus infections (GBS) in our maternity unit using risk-based approach for intrapartum antibiotic prophylaxis, we introduced an antenatal GBS carriage screening programme to identify additional women to target for prophylaxis. OBJECTIVES: To describe the implementation and outcome of an antepartum screening programme for prevention of invasive early-onset GBS infection in a UK maternity unit...
April 18, 2017: BMJ Open
https://www.readbyqxmd.com/read/28417006/first-report-of-serotype-23b-streptococcus-pneumoniae-isolated-from-an-adult-patient-with-invasive-infection-in-japan
#18
A Takamatsu, M Kawaguchiya, B Chang, M Ito, Y Hirano, S Katsuta, S Matsuzaka, Y Serizawa, N Kobayashi
Serotype 23B Streptococcus pneumoniae was isolated from a 67-year-old Japanese patient with meningitis. This isolate was susceptible to penicillin G, while genotyped as gPISP with a mutation in a penicillin-binding motif in PBP2b. The 23B isolate was assigned to ST11996 that is related to CC439, a dominant group among serotype 23B.
May 2017: New Microbes and New Infections
https://www.readbyqxmd.com/read/28416607/human-milk-oligosaccharides-inhibit-growth-of-group-b-streptococcus
#19
Ann E Lin, Chloe A Autran, Alexandra Szyszka, Tamara Escajadillo, Mia Huang, Kamil Godula, Anthony R Prudden, Geert-Jan Boons, Amanda L Lewis, Kelly S Doran, Victor Nizet, Lars Bode
Streptococcus agalactiae (group B Streptococcus; GBS) is a leading cause of invasive bacterial infections in newborns, typically acquired vertically during childbirth secondary to maternal vaginal colonization. Human milk oligosaccharides (HMOs) have important nutritional and biological activities that guide development of the infant's immune system and shape the composition of normal gut microbiota. In this manner, HMOs help protect against pathogen colonization and reduce risk of infection. In the course of our studies of HMO-microbial interactions, we unexpectedly uncovered a novel HMO property to directly inhibit the growth of GBS, independent of host immunity...
April 17, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28401320/the-virulence-factors-of-group-a-streptococcus-strains-isolated-from-invasive-and-non-invasive-infections-in-polish-and-german-centres-2009-2011
#20
M Strus, P B Heczko, E Golińska, A Tomusiak, A Chmielarczyk, M Dorycka, M van der Linden, A Samet, A Piórkowska
Streptococcus pyogenes (GAS) is one of the major human pathogenic bacteria that cause a wide range of diseases. Currently, increased incidence of streptococcal invasive infections is observed worldwide. In this study, we focused on the prevalence of genes encoding superantigens and type M proteins in the population of GAS strains from invasive versus non-invasive infections. We tested 253 GAS strains: 48 strains from patients with invasive infections (18 from wound/deep skin localization, 30 from women in labour) and 205 strains from non-invasive forms (147 from common infections of the upper respiratory, 49 from the vagina of females with genital tract infections and 9 from non-invasive wound and superficial skin infections)...
April 11, 2017: European Journal of Clinical Microbiology & Infectious Diseases
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