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Streptococcus agalactiae

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https://www.readbyqxmd.com/read/28544844/image-of-the-month-concomitant-tricuspid-and-mitral-native-valve-infective-endocarditis
#1
Su-Jin Jeong, Sang-Hoon Seol, Pil Sang Song
A 33-year-old immunocompetent man was admitted to the authors' hospital with a one-month duration of fevers, chills, and non-productive coughs, and suddenonset weakness and ischemic pain of both lower extremities. Physical examination revealed crepitating rales heard over bilateral lung fields. On auscultation, a grade 2~3/6 systolic murmur was heard over the leftlower sternal border and apical area. Transthoracic echocardiography revealed a mobile mass on the tricuspid valve compatible with vegetation, in addition to concomitant mitral valve vegetation (Video 1)...
January 2017: Journal of Heart Valve Disease
https://www.readbyqxmd.com/read/28532793/streptococcus-agalactiae-in-elephants-a-comparative-study-with-isolates-from-human-and-zoo-animal-and-livestock-origin
#2
Tobias Eisenberg, Jörg Rau, Uta Westerhüs, Tobias Knauf-Witzens, Ahmad Fawzy, Karen Schlez, Michael Zschöck, Ellen Prenger-Berninghoff, Carsten Heydel, Reinhard Sting, Stefanie P Glaeser, Dipen Pulami, Mark van der Linden, Christa Ewers
Streptococcus (S.) agalactiae represents a significant pathogen for humans and animals. However, there are only a few elderly reports on S. agalactiae infections in wild and zoo elephants even though this pathogen has been isolated comparatively frequently in these endangered animal species. Consequently, between 2004 and 2015, we collected S. agalactiae isolates from African and Asian elephants (n=23) living in four different zoos in Germany. These isolates were characterised and compared with isolates from other animal species (n=20 isolates) and humans (n=3)...
May 2017: Veterinary Microbiology
https://www.readbyqxmd.com/read/28529026/the-use-of-matrix-assisted-laser-desorption-ionization-time-of-flight-mass-spectrometry-maldi-tof-ms-for-rapid-bacterial-identification-in-patients-with-smear-positive-bacterial-meningitis
#3
Boaz Bishop, Yuval Geffen, Adi Plaut, Ola Kassis, Roni Bitterman, Mical Paul, Ami Neuberger
OBJECTIVES: To assess the potential of matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF-MS) in rapid identification of bacteria from smear-positive cerebrospinal fluid (CSF) in a cohort of patients with meningitis. METHODS: Single-center observational study, including adults and children with community-acquired or postneurosurgical bacterial meningitis. Meningitis was defined using established criteria. CSF samples that had a positive CSF Gram stain were directly examined by MALDI-TOF-MS...
May 18, 2017: Clinical Microbiology and Infection
https://www.readbyqxmd.com/read/28526572/comprehensive-evaluation-of-immunomodulation-by-moderate-hypoxia-in-s-agalactiae-vaccinated-nile-tilapia
#4
Sanchala Gallage, Takayuki Katagiri, Masato Endo, Masashi Maita
Streptococcus agalactiae is a major bacterial pathogen in tilapia aquaculture. Vaccines are known to provide protection but S. agalactiae clearance in tilapia can be reduced by marginal environmental conditions. Therefore, the purpose of this study is to examine S. agalactiae clearance in vaccinated Nile tilapia under moderate hypoxic (55± 5% DO) and normoxic (85 ± 5%DO) conditions. Fish were acclimatized to either moderate hypoxia or normoxia and immunized with formalin-inactivated S. agalactiae. Fish were experimentally challenged with S...
May 16, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28504863/diagnostic-accuracy-of-polymerase-chain-reaction-for-intrapartum-detection-of-group-b-streptococcus-colonization
#5
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/28499213/effect-of-excoecaria-agallocha-on-non-specific-immune-responses-and-disease-resistance-of-oreochromis-niloticus-against-streptococcus-agalactiae
#6
A A Laith, A G Mazlan, A W Effendy, M A Ambak, W W I Nurhafizah, A S Alia, A Jabar, M Najiah
The current study was designed to evaluate the effects of Excoecaria agallocha leaf extracts on immune mechanisms and resistance of tilapia, Oreochromis niloticus, after challenge with Streptococcus agalactiae. Fish were divided into 6 groups; groups 1-5 fed with E. agallocha leaf extracts at 10, 20, 30, 40 and 50mgkg(-1) level, respectively. Group 6 were fed without extract addition and acted as control. E. agallocha extracts were administered as feed supplement in fish diet for 28days and the hematological, immunological, and growth performance studies were conducted...
May 4, 2017: Research in Veterinary Science
https://www.readbyqxmd.com/read/28476676/protective-efficacy-of-cationic-plga-microspheres-loaded-with-dna-vaccine-encoding-the-sip-gene-of-streptococcus-agalactiae-in-tilapia
#7
Yan-Ping Ma, Hao Ke, Zhi-Ling Liang, Jiang-Yao Ma, Le Hao, Zhen-Xing Liu
Streptococcus agalactiae (S. agalactiae) is an important fish pathogen, which has received more attention in the past decade due to the increasing economic losses in the tilapia industry worldwide. As existing effective vaccines of S. agalactiae in fish have obvious disadvantage, to select immunoprotective antigens and package materials would undoubtedly contribute to the development of novel oral vaccines. In the present study, surface immunogenic protein (sip) was selected from the S. agalactiae serovar I a genomes as immunogenic protein in DNA vaccine form with cationic chitosan and biodegradable and biocompatible PLGA...
May 2, 2017: Fish & Shellfish Immunology
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
#8
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/28474347/optimization-of-cord-blood-unit-sterility-testing-impact-of-dilution-analysis-delay-and-inhibitory-substances
#9
Mélissa Girard, Audrey Laforce-Lavoie, Marie Joëlle de Grandmont, Marie-Pierre Cayer, Diane Fournier, Gilles Delage, Louis Thibault
BACKGROUND: Different methods are used by cord blood banks to prepare samples for sterility testing. Suboptimal methods can result in the release of contaminated products. In our organization, samples are prepared by diluting the final product in RPMI-1640 medium. In this work, we have compared our method with different approaches to verify whether optimization should be sought. STUDY DESIGN AND METHODS: Cord blood units (n = 6 units per bacterial strain) characterized to contain inhibitory substances or not were inoculated (10 colony-forming units/mL) with Streptococcus agalactiae, Staphylococcus epidermidis, Klebsiella pneumoniae, Escherichia coli, or Bacteroides fragilis...
May 4, 2017: Transfusion
https://www.readbyqxmd.com/read/28470079/validity-of-somatic-cell-count-as-indicator-of-pathogen-specific-intramammary-infections
#10
Inge-Marié Petzer, Joanne Karzis, Edward F Donkin, Edward C Webb, Eric M C Etter
The objective of this study was to determine whether somatic cell count (SCC) was an effective test, with a sensitivity exceeding 85%, to determine species-specific bacterial infections. In addition, the relation between the SCC and various udder pathogen groups was investigated. SCC thresholds of greater than 200 000 cells/mL were used in quarter and greater than 150 000 cells/mL in composite milk samples. A retrospective study was conducted on a data set for 89 635 quarter and 345 467 composite cow milk samples...
April 13, 2017: Journal of the South African Veterinary Association
https://www.readbyqxmd.com/read/28461319/bacteriophage-lysin-cf-301-a-potent-anti-staphylococcal-biofilm-agent
#11
Raymond Schuch, Babar K Khan, Assaf Raz, Jimmy A Rotolo, Michael Wittekind
Biofilms pose a unique therapeutic challenge because of the antibiotic tolerance of constituent bacteria. Treatments for biofilm-based infections represent a major unmet medical need, requiring novel agents to eradicate mature biofilms. Our objective was to evaluate bacteriophage lysin CF-301 as a new agent to target Staphylococcus aureus biofilms. We used minimum biofilm eradicating concentration (MBEC) assays on ninety-five S. aureus strains to obtain a MBEC90 value of ≤0.25 μg/ml for CF-301. Mature biofilms of coagulase-negative staphylococci, Streptococcus pyogenes, and Streptococcus agalactiae were also sensitive to disruption, with MBEC90 values ranging from 0...
May 1, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28456490/pediatric-bacterial-meningitis-in-japan-2013-2015-3-5-years-after-the-wide-use-of-haemophilus-influenzae-type-b-and-streptococcus-pneumoniae-conjugated-vaccines
#12
Masayoshi Shinjoh, Yoshio Yamaguchi, Satoshi Iwata
BACKGROUND: Haemophilus influenzae type b (Hib) vaccine and pneumococcal conjugated vaccine (PCV) have been widely used since 2010 in Japan when both vaccines were supported by the regional governments, and they were covered as routine recommended vaccines in 2013. The incidence of bacterial meningitis due to these organisms decreased in 2011 and 2012, but meningitis due to Streptococcus agalactiae and Escherichia coli remained unchanged. OBJECTIVES: We planned to confirm whether the incidence also decreased in subsequent years...
April 26, 2017: Journal of Infection and Chemotherapy: Official Journal of the Japan Society of Chemotherapy
https://www.readbyqxmd.com/read/28450213/isolation-characterization-virulence-and-immunogenicity-testing-of-field-isolates-of-pasteurella-multocida-staphylococcus-aureus-and-streptococcus-agalactiae-in-laboratory-settings
#13
Qudratullah, G Muhammad, M Saqib, M Qamar Bilal
The present study was designed to investigate isolation, characterization, virulence and immunogenicity testing of field isolates of Pasteurella multocida, Staphylococcus aureus, and Streptococcus agalactiae in rabbits and mice. Isolates of P. multocida, S. aureus and Str. agalactiae recovered from field cases of Hemorragic septicemia and mastitis were scrutinized for virulence/pathogenicity and immunogenicity. Mouse LD50 of P. multocida showed that P. multocida isolate No.1 was more virulent than isolates No...
April 24, 2017: Acta Tropica
https://www.readbyqxmd.com/read/28442416/molecular-characterization-and-expression-of-interleukin-10-and-interleukin-22-in-golden-pompano-trachinotus-ovatus-in-response-to-streptococcus-agalactiae-stimulus
#14
Yinhui Peng, Xiaohui Cai, Guoyin Zhang, Junlin Wang, Yuan Li, Zhiwen Wang, Bei Wang, Xiangying Xiong, Zaohe Wu, Jichang Jian
In the present study, members of the interleukin (IL)-10 family of cytokines, including IL-10 (TOIL-10) and IL-22 (TOIL-22) of golden pompano (Trachinotus ovatus), were cloned for the first time, and their expression patterns and 3D structures analyzed. The full-length cDNA sequences of TOIL-10 and TOIL-22 contained open reading frames of 564 and 567 bp, respectively. TOIL-10 and TOIL-22 shared higher homology (78%-89%) with the corresponding genes from various fish relative to other species (25%-34%) and contained the IL-10 family signature and four cysteine residues that are well conserved in other vertebrate IL-10 members...
April 22, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28435137/group-b-streptococcus-and-perinatal-mortality
#15
Piet Cools, Pierrette Melin
The World Health Organization estimates that every year, one million neonatal deaths occur because of neonatal infection. Furthermore, an equal number of stillbirths are thought to be caused by infections. Here we discuss the role of Streptococcus agalactiae (group B Streptococcus, GBS) in neonatal disease and stillbirth.
April 20, 2017: Research in Microbiology
https://www.readbyqxmd.com/read/28434736/incidence-of-clinical-mastitis-and-distribution-of-pathogens-on-large-chinese-dairy-farms
#16
Jian Gao, Herman W Barkema, Limei Zhang, Gang Liu, Zhaoju Deng, Lingjie Cai, Ruixue Shan, Shiyao Zhang, Jiaqi Zou, John P Kastelic, Bo Han
Knowledge of the incidence of clinical mastitis (CM) and the distribution of pathogens involved is essential for development of prevention and control programs as well as treatment protocols. No country-wide study on the incidence of CM and the distribution of pathogens involved has been conducted in China. Core objectives of this study were, therefore, to determine the cumulative incidence of CM and the distribution of pathogens causing CM on large Chinese (>500 cows) dairy farms. In addition, associations between the distribution of CM pathogens and bedding materials and seasonal factors were also investigated...
April 20, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28428133/epidemiological-study-of-common-diseases-and-their-risk-factors-in-camels-in-south-punjab-pakistan
#17
Aneela Zameer Durrani, Zubair Bashir, Imran Rasheed, Noor-Ul-Ain Sarwar
Bacteriological study of mastitis along with common blood protozoan diseases were studied in dromedary camels in Cholistan, Dera Ismail Khan and Rahim Yar Khan districts in South Punjab, Pakistan. For this purpose 300 camels were sampled randomly at different common grazing and watering point. For study of blood parasites clinically suspected and apparently healthy camels, 150 each, were sampled. An overall prevalence of 15%and 5% was recorded for trypanosomiasis and Anaplasmosis respectively. Trypanosoma evansi was identified with 280 bp product on polymerase chain reaction test...
April 18, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28425874/in-vitro-and-in-vivo-assessments-of-rhodomyrtus-tomentosa-leaf-extract-as-an-alternative-anti-streptococcal-agent-in-nile-tilapia-oreochromis-niloticus-l
#18
Pinanong Na-Phatthalung, Sasitorn Chusri, Naraid Suanyuk, Supayang Piyawan Voravuthikunchai
PURPOSE: Rhodomyrtustomentosa is a Thai medicinal plant that has been attracting attention for its remarkable antibacterial properties against Gram-positive pathogenic bacteria. The purpose of this study was to evaluate the antibacterial properties of R. tomentosa leaf extract against Streptococcus agalactiae and Streptococcus iniae isolated from infected tilapia. METHODOLOGY: The anti-streptococcal activity of R. tomentosa was determined using broth microdilution assays...
April 2017: Journal of Medical Microbiology
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/28402182/analysis-of-point-mutations-in-the-pbp2x-pbp2b-and-pbp1a-genes-of-streptococcus-agalactiae-and-their-relation-with-a-reduced-susceptibility-to-cephalosporins
#20
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
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