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https://www.readbyqxmd.com/read/28650987/accuracy-of-zika-virus-disease-case-definition-during-simultaneous-dengue-and-chikungunya-epidemics
#1
José Ueleres Braga, Clarisse Bressan, Ana Paula Razal Dalvi, Guilherme Amaral Calvet, Regina Paiva Daumas, Nadia Rodrigues, Mayumi Wakimoto, Rita Maria Ribeiro Nogueira, Karin Nielsen-Saines, Carlos Brito, Ana Maria Bispo de Filippis, Patrícia Brasil
BACKGROUND: Zika is a new disease in the American continent and its surveillance is of utmost importance, especially because of its ability to cause neurological manifestations as Guillain-Barré syndrome and serious congenital malformations through vertical transmission. The detection of suspected cases by the surveillance system depends on the case definition adopted. As the laboratory diagnosis of Zika infection still relies on the use of expensive and complex molecular techniques with low sensitivity due to a narrow window of detection, most suspected cases are not confirmed by laboratory tests, mainly reserved for pregnant women and newborns...
2017: PloS One
https://www.readbyqxmd.com/read/28645088/risk-based-screening-combined-with-a-pcr-based-test-for-group-b-streptococci-diminishes-the-use-of-antibiotics-in-laboring-women
#2
Mohammed R Khalil, Niels Uldbjerg, Poul B Thorsen, Birgitte Henriksen, Jens K Møller
OBJECTIVE: To assess the performance of a polymerase chain reaction - group B streptococci test (PCR-GBS test) - in deciding antibiotic prophylaxis in term laboring women. STUDY DESIGN: In this observational study, we enrolled 902 unselected Danish term pregnant women. During labor, midwives obtained vaginal swabs that were used for both GBS cultures (reference standard) and for the PCR-GBS test. Furthermore, we recorded the presence of risk factors for EOGBS (Early Onset Group B Streptococcal disease): (1) Bacteriuria during current pregnancy, (2) Prior infant with EOGBS (3) Temperature above 38...
June 9, 2017: European Journal of Obstetrics, Gynecology, and Reproductive Biology
https://www.readbyqxmd.com/read/28631186/association-between-epidermal-growth-factor-receptor-amplification-and-adp-ribosylation-factor-1-methylation-in-human-glioblastoma
#3
Concha López-Ginés, Lara Navarro, Lisandra Muñoz-Hidalgo, Enrique Buso, José Manuel Morales, Rosario Gil-Benso, Mariela Gregori-Romero, Javier Megías, Pedro Roldán, Remedios Segura-Sabater, José Manuel Almerich-Silla, Daniel Monleón, Miguel Cerdá-Nicolás
PURPOSE: Glioblastoma (GB) is the most frequent and most malignant primary brain tumor in adults. Previously, it has been found that both genetic and epigenetic factors may play critical roles in its etiology and prognosis. In addition, it has been found that the epidermal growth factor receptor gene (EGFR) is frequently over-expressed and amplified in primary GBs. Here, we assessed the promoter methylation status of 10 genes relevant to GB and explored associations between these findings and the EGFR gene amplification status...
June 19, 2017: Cellular Oncology (Dordrecht)
https://www.readbyqxmd.com/read/28624908/development-and-validation-of-kasp-markers-for-the-greenbug-resistance-gene-gb7-and-the-hessian-fly-resistance-gene-h32-in-wheat
#4
Chor-Tee Tan, Hangjin Yu, Yan Yang, Xiangyang Xu, Mingshun Chen, Jackie C Rudd, Qingwu Xue, Amir M H Ibrahim, Lisa Garza, Shichen Wang, Mark E Sorrells, Shuyu Liu
Greenbug and Hessian fly are important pests that decrease wheat production worldwide. We developed and validated breeder-friendly KASP markers for marker-assisted breeding to increase selection efficiency. Greenbug (Schizaphis graminum Rondani) and Hessian fly [Mayetiola destructor (Say)] are two major destructive insect pests of wheat (Triticum aestivum L.) throughout wheat production regions in the USA and worldwide. Greenbug and Hessian fly infestation can significantly reduce grain yield and quality. Breeding for resistance to these two pests using marker-assisted selection (MAS) is the most economical strategy to minimize losses...
June 17, 2017: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
https://www.readbyqxmd.com/read/28622535/vitamin-d-mediates-the-relationship-between-placental-cathelicidin-and-group-b-streptococcus-colonization-during-pregnancy
#5
Christine C Akoh, Eva K Pressman, Corrie M Whisner, Carrie Thomas, Chang Cao, Tera Kent, Elizabeth Cooper, Kimberly O O'Brien
Vitamin D is thought to modulate innate immune responses, and recent studies have highlighted the autocrine and paracrine functions of vitamin D in the placenta. Our objective was to determine the relationship between maternal vitamin D status and placental antimicrobial peptide (AMP) expression in a group of racially and ethnically diverse pregnant adolescents. In this study, 158 pregnant adolescents were recruited from the Rochester Adolescent Maternity Program (RAMP) in Rochester, NY. Maternal serum concentrations of the vitamin D biomarkers, 25-hydroxyvitamin D (25(OH)D) and 1,25-dihydroxyvitamin D (1,25(OH)2D), were measured at mid-gestation (∼26 weeks) and at delivery...
June 6, 2017: Journal of Reproductive Immunology
https://www.readbyqxmd.com/read/28621047/clinical-value-of-polymerase-chain-reaction-in-detecting-group-b-streptococcus-during-labor
#6
Dorothea Maria Koppes, Antonius Arnoldus Cornelis Maria Vriends, Michiel van Rijn, Antonine Dimphne van Heesewijk
AIM: To reduce the intrapartum use of antibiotics in women with prolonged rupture of the membranes (PROM) by restriction of antibiotics to women who are colonized with group B streptococci (GBS), as identified with the Cepheid Gene Xpert polymerase chain reaction (PCR) for detecting GBS. METHODS: We conducted a randomized controlled trial among full-term delivering women with PROM. Fifty-four women were enrolled, based on a power calculation with a significance level of 5% and a power of 95%...
June 2017: Journal of Obstetrics and Gynaecology Research
https://www.readbyqxmd.com/read/28615470/identification-of-the-group-b-streptococcus-capsule-type-using-a-dual-phenotypic-genotypic-assay
#7
Areej Alhhazmi, Armaan Pandey, Gregory J Tyrrell
The Group B streptococcus (GBS) capsular polysaccharide (CPS) is an important virulence factor which is also used for GBS typing. There are 10 CPS types (Ia, Ib and II-IX). GBS that do not phenotypically type are considered non-typable. All genes required for CPS synthesis are found on the GBS cps operon, which contains a highly variable CPS-determining region (cpsG-cpsK).The objective of this study was development of an assay to detect sialic acid on the GBS cell surface followed by a genotypic PCR CPS typing assay...
June 14, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28583016/a-comparison-of-enriched-culture-and-xpert-polymerase-chain-reaction-assay-of-group-b-streptococcus-carrier-status-at-35-37-week-gestation-to-labor-onset-a-prospective-controlled-study
#8
Yuri Perlitz, Moshe Ben-Ami, Emanuel C Megory, Orna Nitzan, Tal Bouganim, Johnny S Younis, Nora Shapso, Avi Peretz
OBJECTIVES: (1) To compare the accuracy of vagino-rectal enriched culture (EC) and a rapid polymerase chain reaction (PCR) test for the detection of Group B streptococcus (GBS) carrier status at 35-37-week gestation and at onset of labor (2). To assess the conversion rate of GBS carrier status between 35-37 weeks to the onset of labor according to the EC/PCR tests. A prospective study was performed at a women's health clinic, referred to give birth at one medical center. STUDY POPULATION: low risk pregnant women at 35-37-week gestation who did not know their GBS carrier status...
June 6, 2017: Journal of Maternal-fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/28575919/zika-virus-infection-in-pregnant-women-and-microcephaly
#9
Geraldo Duarte, Antonio Fernandes Moron, Artur Timerman, César Eduardo Fernandes, Corintio Mariani Neto, Gutemberg Leão de Almeida Filho, Heron Werner Junior, Hilka Flavia Barra do Espírito Santo, João Alfredo Piffero Steibel, João Bortoletti Filho, Juvenal Barreto Borriello de Andrade, Marcelo Burlá, Marcos Felipe Silva de Sá, Newton Eduardo Busso, Paulo César Giraldo, Renato Augusto Moreira de Sá, Renato Passini Junior, Rosiane Mattar, Rossana Pulcineli Vieira Francisco
From the discovery of the Zika virus (ZIKV) in 1947 in Uganda (Africa), until its arrival in South America, it was not known that it would affect human reproductive life so severely. Today, damage to the central nervous system is known to be multiple, and microcephaly is considered the tip of the iceberg. Microcephaly actually represents the epilogue of this infection's devastating process on the central nervous system of embryos and fetuses. As a result of central nervous system aggression by the ZIKV, this infection brings the possibility of arthrogryposis, dysphagia, deafness and visual impairment...
May 2017: Revista Brasileira de Ginecologia e Obstetrícia
https://www.readbyqxmd.com/read/28571573/comparison-of-molecular-serotyping-approaches-of-streptococcus-agalactiae-from-genomic-sequences
#10
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/28569141/disease-burden-and-antimicrobial-resistance-of-invasive-group-b-streptococcus-among-infants-in-china-a-protocol-for-a-national-prospective-observational-study
#11
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/28562753/group-b-streptococcus-detection-in-pregnant-women-via-culture-and-pcr-methods
#12
Cláudia Wollheim, Rosa Dea Sperhacke, Sabrina Kahler Ribeiro Fontana, Andréa Cristina Vanni, Sérgio Kakuta Kato, Patricia Regina de Araújo, Afonso Luis Barth, José Mauro Madi
INTRODUCTION: Group B Streptococcus (GBS), a source of neonatal infection, colonizes the gastrointestinal and genitourinary tracts of pregnant women. Routine screening for maternal GBS in late pregnancy and consequent intrapartum antibiotic prophylaxis have reduced the incidence of early-onset GBS neonatal infection. The aim of this study was to evaluate the performance of PCR, compared to culture (gold standard), in GBS colonization screening of pregnant women, and to establish the prevalence of GBS colonization among this population...
March 2017: Revista da Sociedade Brasileira de Medicina Tropical
https://www.readbyqxmd.com/read/28530022/development-of-a-reverse-transcription-quantitative-polymerase-chain-reaction-based-assay-for-broad-coverage-detection-of-african-and-asian-zika-virus-lineages
#13
Yang Yang, Gary Wong, Baoguo Ye, Shihua Li, Shanqin Li, Haixia Zheng, Qiang Wang, Mifang Liang, George F Gao, Lei Liu, Yingxia Liu, Yuhai Bi
The Zika virus (ZIKV) is an arbovirus that has spread rapidly worldwide within recent times. There is accumulating evidence that associates ZIKV infections with Guillain-Barré Syndrome (GBS) and microcephaly in humans. The ZIKV is genetically diverse and can be separated into Asian and African lineages. A rapid, sensitive, and specific assay is needed for the detection of ZIKV across various pandemic regions. So far, the available primers and probes do not cover the genetic diversity and geographic distribution of all ZIKV strains...
May 19, 2017: Virologica Sinica
https://www.readbyqxmd.com/read/28504863/diagnostic-accuracy-of-polymerase-chain-reaction-for-intrapartum-detection-of-group-b-streptococcus-colonization
#14
Rikke Bek Helmig, Jan Berg Gertsen
Many pregnant women are treated with antibiotics during labor to prevent transmission of group B Streptococcus (GBS, Streptococcus agalactiae) to their baby during the passage of the birth canal, and thus reducing the risk of serious infection of the newborn. Methods for intrapartum testing for GBS has been introduced to select women for whom intrapartum antibiotic prophylaxis should be offered. For such an intrapartum test to be useful in clinical practice, it has to be specific as well as sensitive. The aim of the present study is to evaluate the accuracy of the polymerase chain reaction (PCR) assay compared to an optimized culture method for GBS MATERIAL AND METHODS: In the period from 12...
May 15, 2017: Acta Obstetricia et Gynecologica Scandinavica
https://www.readbyqxmd.com/read/28479349/development-of-the-abbott-realtime-zika-assay-for-the-qualitative-detection-of-zika-virus-rna-from-serum-plasma-urine-and-whole-blood-specimens-using-the-m2000-system
#15
Matthew B Frankel, Kinnari Pandya, Jeffrey Gersch, Sarah Siddiqui, George J Schneider
Zika virus is an arthropod-borne flavivirus that has rapidly developed into a world-wide concern. Discovered in 1947, the virus was relatively obscure until an outbreak occurred in 2007 in the Yap islands and spread eventually to the Americas in 2015. Only 20% of patients infected with Zika virus develop symptoms. However, there can be serious consequences of infection including birth defects in developing fetuses and links to Guillain-Barré syndrome. The swift rise in infections has necessitated the development of diagnostic tests for both the detection of viral RNA and the presence of virus-specific antibodies...
August 2017: Journal of Virological Methods
https://www.readbyqxmd.com/read/28446575/evaluation-of-strepb-select-chromagar-and-the-fast-track-diagnostics-group-b-streptococcus-gbs-real-time-polymerase-chain-reaction-assay-compared-to-routine-culture-for-detection-of-gbs-during-antepartum-screening
#16
Deirdre L Church, Heather Baxter, Tracie Lloyd, Oscar Larios, Daniel B Gregson
Life-threatening infection in neonates due to Group B Streptococcus (GBS) is preventable by screening near-term pregnant women and treatment at delivery. 295 vaginal-rectal swabs were collected from women attending antepartum clinics in Calgary. GBS colonization was detected by the standard culture method (Strep B Carrot broth subbed to blood agar with a neomycin disk), and compared to recovery using Strep Group B Broth (Dalynn Biologicals) subbed to StrepB Select chromagar (CA) (Bio-Rad Laboratories), and the Fast Track Diagnostics GBS real-time PCR (qPCR) assay (Phoenix Airmid Biomedical Corp...
April 26, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28402182/analysis-of-point-mutations-in-the-pbp2x-pbp2b-and-pbp1a-genes-of-streptococcus-agalactiae-and-their-relation-with-a-reduced-susceptibility-to-cephalosporins
#17
Giorgio Piccinelli, Giuseppe Carlentini, Franco Gargiulo, Arnaldo Caruso, Maria Antonia De Francesco
The emergence of group B Streptococcus (GBS) isolates with reduced penicillin susceptibility (PRGBS) and their tendency to be nonsusceptible to fluoroquinolones prompted us to analyze the possible presence of amino acid mutations in penicillin-binding proteins (PBPs) (PBP2X, PBP1A, and PBP2B) from a collection of fluoroquinolone-resistant GBS isolates. We analyzed 21 GBS isolates resistant to levofloxacin. Sequence analysis of genes for PBPs was performed. The minimal inhibitory concentrations (MICs) for penicillin, ceftibuten, cefaclor, cefixime, cefotaxime, and ceftizoxime were performed by the Etest method and by broth microdilution method...
April 12, 2017: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
https://www.readbyqxmd.com/read/28381212/low-depth-genotyping-by-sequencing-gbs-in-a-bovine-population-strategies-to-maximize-the-selection-of-high-quality-genotypes-and-the-accuracy-of-imputation
#18
Jean-Simon Brouard, Brian Boyle, Eveline M Ibeagha-Awemu, Nathalie Bissonnette
BACKGROUND: Genotyping-by-sequencing (GBS) has emerged as a powerful and cost-effective approach for discovering and genotyping single-nucleotide polymorphisms. The GBS technique was largely used in crop species where its low sequence coverage is not a drawback for calling genotypes because inbred lines are almost homozygous. In contrast, only a few studies used the GBS technique in animal populations (with sizeable heterozygosity rates) and many of those that have been published did not consider the quality of the genotypes produced by the bioinformatic pipelines...
April 5, 2017: BMC Genetics
https://www.readbyqxmd.com/read/28321367/evaluation-of-procedures-for-typing-of-group-b-streptococcus-a-retrospective-study
#19
Hans-Christian Slotved, Steen Hoffmann
BACKGROUND: This study evaluates two procedures for typing of Streptococcus agalactiae (group B streptococci; GBS) isolates, using retrospective typing data from the period 2010 to 2014 with a commercial latex agglutination test (latex test) and the Lancefield precipitation test (LP test). Furthermore, the genotype distribution of phenotypically non-typable (NT) GBS isolates is presented. We also raise the awareness, that the difference in typing results obtained by phenotypical methods and genotype based methods may have implications on vaccine surveillance in case a GBS vaccine is introduced...
2017: PeerJ
https://www.readbyqxmd.com/read/28315021/clinical-strains-of-streptococcus-agalactiae-carry-two-different-variants-of-pathogenicity-island-xii
#20
Eugenia Kuleshevich, Joseph Ferretti, Ilda Santos Sanches, Natesan Balasubramanian, Barbara Spellerberg, Androulla Efstratiou, Paula Kriz, Kornelia Grabovskaya, Olga Arjanova, Alevtina Savitcheva, Valentin Shevchenko, Anton Rysev, Alexander Suvorov
Streptococcus agalactiae or Group B streptococci (GBS) are a common cause of serious diseases of newborns and adults. GBS pathogenicity largely depends on genes located on the accessory genome including several pathogenicity islands (PAI). The present paper is focused on the structure and molecular epidemiological analysis of one of the GBS pathogenicity islands-the pathogenicity island PAI XII (Glaser et al. Mol Microbiol 45(6):1499-1513, 2002). This PAI was found to be composed of three different mobile genetic elements: a composite transposon (PAI-C), a genomic islet (PAI-B), and a pathogenicity island associated with gene sspB1 (PAI-A)...
March 18, 2017: Folia Microbiologica
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