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Streptococcus agalactiae

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https://www.readbyqxmd.com/read/29454032/basal-polarization-of-the-immune-responses-to-streptococcus-agalactiae-susceptible-and-resistant-tilapia-oreochromis-niloticus
#1
Jiajie Zhu, Xi Gan, Qiuwei Ao, Xiashuang Shen, Yun Tan, Ming Chen, Yongju Luo, Hui Wang, Hesheng Jiang, Chao Li
One of the highest priority areas for improvement is the development of effective strategies for decreasing disease mortality levels in aquaculture production, a better understanding of the components of the fish immune system and their functions in the context of pathogen invasion is needed. Tilapia is the most common fish in South China, and Streptococcus agalactiae has become the most serious disease problem for tilapia industry in China. Here, we profiled gene expression differences between tilapia differing in their susceptibility to S...
February 14, 2018: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/29451592/prevalence-of-streptococcus-agalactiae-colonization-in-pregnant-women-from-the-18th-health-region-of-paran%C3%A3-state
#2
Simone Cristina Castanho Sabaini de Melo, Aline Balandis Costa, Flávia Teixeira Ribeiro da Silva, Natália Maria Maciel Guerra Silva, Cristiano Massao Tashima, Rosilene Fressatti Cardoso, Rúbia Andreia F de Pádua, Isolde Previdelli, Maria Dalva de Barros Carvalho, Sandra Marisa Pelloso
Introduction The aim of this study was to determine the prevalence of GBS colonization in pregnant women in a public health service. Methods A study of 496 pregnant women at 35-37 gestational weeks was conducted from September 2011 to March 2014 in 21 municipalities of the 18th Health Region of Paraná State. Vaginal and anorectal samples of each woman were plated on sheep blood agar, and in HPTH and Todd-Hewitt enrichment broths. Results Of the 496 pregnant women, 141 (28.4%) were positive for GBS based on the combination of the three culture media with vaginal and anorectal samples...
2018: Revista do Instituto de Medicina Tropical de São Paulo
https://www.readbyqxmd.com/read/29451013/pradimicin-ird-from-amycolatopsis-sp-ird-009-and-its-antimicrobial-and-cytotoxic-activities
#3
Anelize Bauermeister, Felipe A Calil, Francisco das C L Pinto, Talita C T Medeiros, Larissa C Almeida, Leonardo J Silva, Itamar S de Melo, Tiago D Zucchi, Letícia V Costa-Lotufo, Luiz A B Moraes
A new polycyclic antibiotic, pradimicin-IRD, was isolated from actinobacteria Amycolatopsis sp. IRD-009 recovered from soil of Brazilian rainforest undergoing restoration area. This molecule is the major compound produced in solid culture media. The new compound was detected by a focused method of precursor ion (high-performance liquid chromatography coupled to tandem mass spectrometer) developed previously to identify unusual aminoglycosyl sugar moieties. The compound was isolated and its structure was, therefore, elucidated by high-resolution mass spectrometry, and 1D and 2D nuclear magnetic resonance experiments...
February 16, 2018: Natural Product Research
https://www.readbyqxmd.com/read/29449095/relationships-between-bacteriospermia-dna-integrity-nuclear-protamine-alteration-sperm-quality-and-icsi-outcome
#4
Ali Zeyad, Mohammed Hamad, Houda Amor, Mohamad Eid Hammadeh
The Aim of this study was to evaluate the effects of bacteriospermia on human sperm parameters, nuclear protamines, DNA integrity and ICSI outcome in patients enrolled for ICSI treatment. 84 unselected couples consulting in infertility and obstetrics clinic and enrolled for ICSI treatment were included in this study. The semen specimens were screened bacteriologically; semen and sperm parameters were also evaluated according to WHO guidelines. DNA integrity, protamines concentration and protamine deficiency were estimated by TUNEL assay, AU-PAGE and Chromomycin (CMA3) respectively...
February 12, 2018: Reproductive Biology
https://www.readbyqxmd.com/read/29421962/molecular-dynamics-simulation-of-metal-free-structure-of-lmb-a-laminin-binding-adhesin-of-streptococcus-agalactiae-metal-removal-and-its-structural-implications
#5
Upasana Sridharan, Preethi Ragunathan, Barbara Spellerberg, Karthe Ponnuraj
Metal binding receptors are one of the extracellular components of ATP-binding cassette transporters that are essential for regulation of metal homeostasis in bacteria. Laminin binding adhesin (Lmb) of Streptococcus agalactiae falls under this class of solute binding proteins. It binds to zinc with a high affinity. Crystal structure of Lmb solved previously by our group reveals that the zinc is tetrahedrally coordinated by three histidines and a glutamate at the interdomain cleft. Lmb contains a long disordered loop close to the metal binding site whose precise function is unknown...
February 8, 2018: Journal of Biomolecular Structure & Dynamics
https://www.readbyqxmd.com/read/29407233/efficacy-of-dietary-curcumin-supplementation-as-bactericidal-for-silver-catfish-against-streptococcus-agalactiae
#6
Matheus D Baldissera, Carine F Souza, Carla C Zeppenfeld, Sharine Descovi, Vanessa S Machado, Roberto C V Santos, Bernardo Baldisserotto
The antibiotics were frequently used for combating bacterial infections in aquaculture, but this treatment causes antibiotic resistance, negative impact on the environment and on health, and accumulation of residual in edible tissues. Several evidences have considered the dietary supplementation with natural products an interesting alternative to antibiotics, as the use of curcumin, a polyphenol with anti-inflammatory, antioxidant and antimicrobial properties. Thus, the aim of this study was to evaluate whether fish fed with a diet containing 150 mg curcumin/kg feed is able to enhance the resistance of silver catfish to Streptococcus agalactiae infection...
January 30, 2018: Microbial Pathogenesis
https://www.readbyqxmd.com/read/29399583/status-of-group-b-streptococcal-vaccine-development
#7
Shun Mei Lin, Yong Zhi, Ki Bum Ahn, Sangyong Lim, Ho Seong Seo
Streptococcus agalactiae (group B streptococcus, GBS) is a leading causal organism of neonatal invasive diseases and severe infections in the elderly. Despite significant advances in the diagnosis and treatment of GBS infections and improvement in personal hygiene standards, this pathogen is still a global health concern. Thus, an effective vaccine against GBS would augment existing strategies to substantially decrease GBS infection. In 2014, World Health Organization convened the first meeting for consultation on GBS vaccine development, focusing on the GBS maternal immunization program, which was aimed at reducing infections in neonates and young infants worldwide...
January 2018: Clinical and Experimental Vaccine Research
https://www.readbyqxmd.com/read/29390957/streptococcus-agalactiae-meningoencephalitis-associated-with-gastroesophageal-reflux-disease-and-chronic-proton-pump-inhibitors-use-in-a-9%C3%A2-month-old-infant-a-case-report
#8
Victoria Bîrluţiu, Codruța Mihaela Luca, Rareș-Mircea Bîrluțiu
BACKGROUND: Streptococcus agalactiae (Group B Streptococcus) is recognized as the etiologic agent of newborn and infant meningitis, aged up to 90 days, starting from the colonization of the maternal genital or gastrointestinal tract, but it is rarely responsible for meningitis in old infants. CASE PRESENTATION: We present the case of a 9 month-old infant diagnosed with S. agalactiae meningoencephalitis associated with chronic gastroesophageal reflux disease treated with a proton pump inhibitor (PPI)...
February 1, 2018: BMC Pediatrics
https://www.readbyqxmd.com/read/29378799/a-vaginal-tract-signal-detected-by-the-gbs-saers-system-elicits-transcriptomic-changes-and-enhances-murine-colonization
#9
Laura C Cook, Hong Hu, Mark Maienschein-Cline, Michael J Federle
Streptococcus agalactiae (Group B Streptococcus, GBS) can colonize the human vaginal tract leading to both superficial and serious infections in adults and neonates. To study bacterial colonization of the reproductive tract in a mammalian system, we employ a murine vaginal carriage model. Using RNASeq, the transcriptome of GBS growing in vivo during vaginal carriage was determined. Over one-quarter of the genes in GBS are found to be differentially regulated during in vivo colonization as compared to laboratory cultures...
January 29, 2018: Infection and Immunity
https://www.readbyqxmd.com/read/29378338/phenotypic-and-molecular-characterization-of-streptococcus-agalactiae-colonized-in-chinese-pregnant-women-predominance-of-st19-iii-and-st17-iii
#10
Xiaolin Wang, Xuelian Cao, Shunming Li, Qianting Ou, Dongxin Lin, Zhenjiang Yao, Sidong Chen, Chuan'an Wu, Guoming Wen, Xiaohua Ye
Streptococcus agalactiae (GBS) remains a major cause of invasive infections in neonates and pregnant women. Our aim was to evaluate the phenotypic and molecular characteristics of GBS isolates in order to reveal potential relationships among molecular characteristics and differences in genotype-phenotype characteristics between ST17 and ST19. A total of 104 GBS isolates were collected from pregnant women. All isolates were tested for antibiotic susceptibility by disk diffusion method and molecular characteristics, including antibiotic-resistant genes, virulence genes, serotypes and STs...
January 26, 2018: Research in Microbiology
https://www.readbyqxmd.com/read/29371153/pilus-encoding-islets-in-s-agalactiae-and-its-association-with-antibacterial-resistance-and-serotype-distribution
#11
Farzaneh Khodaei, Mohammad Najafi, Alka Hasani, Enayatollah Kalantar, Esmail Sharifi, Abbas Amini, Mohammad Aghazadeh
Group B Streptococcus (GBS) is a versatile organism which uses multiple virulence factors which bind to the surface of epithelial cells. Pili are one of virulence factors detected in recent years. A total of 90 isolates were collected from invasive and non-invasive isolates among adults throughout 2014-2015. Isolates were serotyped at molecular level based on capsular polysaccharide (cps) serotyping and analyzed for pilus island profiles, scpB gene, and hvgA gene presence. Isolates were subjected to antimicrobial susceptibility towards penicillin, tetracycline, erythromycin, clindamycin, moxifloxacin, levofloxacin, and vancomycin by disk diffusion method and MICs for erythromycin and clindamycin were determined by broth dilution methods...
January 22, 2018: Microbial Pathogenesis
https://www.readbyqxmd.com/read/29353079/expression-and-functional-characterization-of-transferrin-in-nile-tilapia-oreochromis-niloticus-in-response-to-bacterial-infection
#12
Xiaoxue Yin, Liangliang Mu, Xia Bian, Liting Wu, Bingxi Li, Jing Liu, Zheng Guo, Jianmin Ye
Transferrin (TF), an iron-binding glycoprotein, plays an important role in host defense against pathogenic infection, which inhibits the growth and proliferation of pathogens, deprives iron from invading pathogens, and activates anti-microbial responses in macrophages. In this study, a TF homologue (OnTF) was identified from Nile tilapia (Oreochromis niloticus) and characterized at expression pattern against bacterial infection and capability binding bacterial pathogens. The open reading frame of OnTF is 2118 bp of nucleotide sequence encoding polypeptides of 705 amino acids...
January 15, 2018: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/29349940/etiology-of-invasive-bacterial-infections-in-immunocompetent-children-in-korea-2006-2010-a-retrospective-multicenter-study
#13
Kyuyol Rhie, Eun Hwa Choi, Eun Young Cho, Jina Lee, Jin Han Kang, Dong Soo Kim, Yae Jean Kim, Youngmin Ahn, Byung Wook Eun, Sung Hee Oh, Sung Ho Cha, Young Jin Hong, Kwang Nam Kim, Nam Hee Kim, Yun Kyung Kim, Jong Hyun Kim, Taekjin Lee, Hwang Min Kim, Kun Song Lee, Chun Soo Kim, Su Eun Park, Young Mi Kim, Chi Eun Oh, Sang Hyuk Ma, Dae Sun Jo, Young Youn Choi, Hoan Jong Lee
BACKGROUND: Invasive bacterial infections in apparently immunocompetent children were retrospectively analyzed to figure causative bacterial organisms in Korea. METHODS: A total of 947 cases from 25 university hospitals were identified from 2006 to 2010 as a continuance of a previous 10-year period study from 1996 to 2005. RESULTS: Escherichia coli (41.3%), Streptococcus agalactiae (27.7%), and Staphylococcus aureus (27.1%) were the most common pathogens in infants < 3 months of age...
February 5, 2018: Journal of Korean Medical Science
https://www.readbyqxmd.com/read/29349788/roles-of-water-quality-and-disinfectant-application-on-inactivation-of-fish-pathogenic-streptococcus-agalactiae-with-povidone-iodine-quaternary-ammonium-compounds-and-glutaraldehyde
#14
N Mon-On, W Surachetpong, S Mongkolsuk, K Sirikanchana
Streptococcosis is an important bacterial disease in Nile tilapia causing severe economic losses to tilapia aquaculture worldwide. The effects of water quality (low- [LS] and high-level [HS] soiling, to mimic clean or dirty surface conditions and temperatures) and disinfectant application (diluted concentrations and exposure time) were characterized on the inactivation of Streptococcus agalactiae isolated from diseased tilapia. Five isolates were tested against three commercial disinfectant products with the main ingredients being povidone iodine (Anidine 100™; AD), benzalkonium chloride (Better BKC 80%™; BKC 80), and a mixture of quaternary ammonium compounds and glutaraldehyde (Chloraldehyde™; CR)...
January 19, 2018: Journal of Fish Diseases
https://www.readbyqxmd.com/read/29337246/tlr3-gene-in-japanese-sea-perch-lateolabrax-japonicus-molecular-cloning-characterization-and-expression-analysis-after-bacterial-infection
#15
Pengfei Wang, Chao Zhao, Chengyang Wang, Sigang Fan, Lulu Yan, Lihua Qiu
Toll-like receptors (TLRs) play important roles in fish innate immune and are involved in the defense process of bacteria invasion. In the present study, the full-length cDNA of TLR3 from the sea perch, Lateolabrax japonicus, was cloned and characterized. The full length of LjTLR3 cDNA was 3265 bp including an open reading frame of 2679 bp encoding a peptide of 922 amino acids. Tissues distribution analysis indicated that LjTLR3 showed a tissue-specific variation with high expression in spleen, head-kidney and liver...
January 11, 2018: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/29331467/canadian-national-dairy-study-herd-level-milk-quality
#16
C A Bauman, H W Barkema, J Dubuc, G P Keefe, D F Kelton
The objective of this study was to estimate Canadian national milk quality parameters and estimate the bulk tank milk (BTM) prevalence of 4 mastitis pathogens, Staphylococcus aureus, Streptococcus agalactiae, Mycoplasma bovis, and Prototheca spp., on Canadian dairy farms. A questionnaire was sent to all Canadian dairy producers. Of the 1,062 producers who completed the questionnaire, 374 producers from across the country were visited and milking hygiene was assessed. Farm-level milk quality data for all Canadian dairy producers was collected from the provincial marketing boards and combined with the questionnaire and farm visit data...
January 10, 2018: Journal of Dairy Science
https://www.readbyqxmd.com/read/29317307/transgenic-expression-of-tilapia-piscidin-3-tp3-in-zebrafish-confers-resistance-to-streptococcus-agalactiae
#17
Bor-Chyuan Su, Yung-Wei Lai, Jyh-Yih Chen, Chieh-Yu Pan
To study the biological role of tilapia piscidin 3 (TP3) in Streptococcus agalactiae infection in vivo, TP3/DsRed overexpressing transgenic zebrafish were generated. Under normal growth conditions, TP3/DsRed transgenic zebrafish exhibited an orange-red body color, without any other obvious abnormalities. However, when compared to wild type fish, TP3/DsRed transgenic zebrafish were resistant to S. agalactiae infection. After infection, the TP3 overexpressing fish exhibited higher expression of Toll-like receptor 4a (TLR4a), interleukin (IL)-10, IL-22, and C3b...
January 6, 2018: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/29301904/complete-genome-sequences-of-three-streptococcus-agalactiae-serotype-ia-isolates-obtained-from-disease-outbreaks-in-nile-tilapia-oreochromis-niloticus
#18
Anita Jaglarz, Artur Gurgul, William J Leigh, Janina Z Costa, Kim D Thompson
This paper describes the whole-genome sequences for three Streptococcus agalactiae serotype Ia isolates. The isolates were recovered from the brains of clinically sick tilapia, Oreochromis niloticus, that were suffering from streptococcosis. One isolate was from tilapia in the United States and the other two from fish in China.
January 4, 2018: Genome Announcements
https://www.readbyqxmd.com/read/29299896/infective-endocarditis-presenting-as-endogenous-endophthalmitis-secondary-to-streptococcus-agalactiae-in-a-healthy-adult-case-reports-and-literature-review
#19
Yu Ra Sim, Ye Jin Lee, Seung Woon Park, Sang Hyun Kim, Ju Hee Choi, Jung Yoon Choi, Min Ja Kim, Jang Wook Sohn, Jaemoon Ahn, Young Kyung Yoon
Endogenous endophthalmitis secondary to group B Streptococcus (GBS) is extremely rare, particularly in healthy adults. However, the visual prognosis is poor. We report the first South Korean case of GBS infective endocarditis presenting as endogenous endophthalmitis and skin and soft tissue infection. Cultures of blood, vitreous humor, and pus from skin aspirates yielded a penicillin-susceptible serotype V strain of Streptococcus agalactiae. After 6 weeks, the patient completely recovered from GBS infective endocarditis...
December 2017: Infection & Chemotherapy
https://www.readbyqxmd.com/read/29290098/rotavirus-infection-as-a-frequent-cause-of-neonatal-fever
#20
Ha-Na Kang, Hyun Kyung Park, Hyun-Ju Lee, Jin-Hwa Moon, Jae Won Oh, Chang-Ryul Kim
BACKGROUND: Fever rather than diarrhea or vomiting was the most common symptom of neonatal rotavirus(RV) infection in our previous study. We investigated if RV infection is a major cause of neonatal fever and we compared the clinical characteristics of bacterial infections, viral infections and unknown causes of neonatal fever. METHOD: We reviewed the electronic medical records of 48 newborns of ≤ 28 days who were admitted to the Special Care Nursery of Hanyang University Guri Hospital for fever (≥ 38°C) from 2005 to 2009...
December 31, 2017: Pediatrics International: Official Journal of the Japan Pediatric Society
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