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Streptococcus agalactiae

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https://www.readbyqxmd.com/read/28807772/streptococcus-agalactiae-impairs-cerebral-bioenergetics-in-experimentally-infected-silver-catfish
#1
Matheus D Baldissera, Carine F Souza, Belisa S Parmeggiani, Roberto C V Santos, Guilhian Leipnitz, Karen L S Moreira, Maria Izabel U M da Rocha, Marcelo L da Veiga, Bernardo Baldisserotto
It is becoming evident that bacterial infectious diseases affect brain energy metabolism, where alterations of enzymatic complexes of the mitochondrial respiratory chain and creatine kinase (CK) lead to an impairment of cerebral bioenergetics which contribute to disease pathogenesis in the central nervous system (CNS). Based on this evidence, the aim of this study was to evaluate whether alterations in the activity of complex IV of the respiratory chain and CK contribute to impairment of cerebral bioenergetics during Streptococcus agalactiae infection in silver catfish (Rhamdia quelen)...
August 11, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28803959/thymosin-%C3%AE-4-is-involved-in-the-antimicrobial-immune-response-of-golden-pompano-trachinotus-ovatus
#2
Yun Sun, Xiaojuan Chen, Yue Xu, Qiaohong Liu, Xue Jiang, Shifeng Wang, Weiliang Guo, Yongcan Zhou
Thymosin beta belongs to the thymosin family, which consists of a series of highly conserved peptides involved in various biological processes. In teleosts, understanding of the immunological functions of thymosin beta is limited, particularly in vivo, which is essentially unknown. In the current study, we cloned and identified thymosin beta 4 from the teleost fish Golden pompano (Trachinotus ovatus), which we have named TroTβ4. We investigated the expression patterns and functions of TroTβ4 in both in vivo and in vitro assays...
August 10, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28798952/prevalence-of-subclinical-mastitis-and-distribution-of-pathogens-in-dairy-farms-of-rubavu-and-nyabihu-districts-rwanda
#3
J P Mpatswenumugabo, L C Bebora, G C Gitao, V A Mobegi, B Iraguha, O Kamana, B Shumbusho
A cross-sectional study was conducted from May 2016 to January 2017 in Rubavu and Nyabihu districts, Western Rwanda, aiming at estimating the prevalence of subclinical mastitis (SCM) and identifying its causative bacteria. Management practices and milking procedures were recorded through a questionnaire. 123 crossbreed milking cows from 13 dairy farms were randomly selected and screened for SCM using California Mastitis Test (CMT). Composite CMT positive milk samples were processed for bacterial isolation and identification...
2017: Journal of veterinary medicine
https://www.readbyqxmd.com/read/28783417/molecular-characterization-of-italian-isolates-of-fluoroquinolone-resistant-streptococcus-agalactiae-and-relationships-with-chloramphenicol-resistance
#4
Serena Simoni, Chiara Vincenzi, Andrea Brenciani, Gianluca Morroni, Patrizia Bagnarelli, Eleonora Giovanetti, Pietro E Varaldo, Marina Mingoia
A total number of 368 clinical isolates of Streptococcus agalactiae (group B Streptococcus, GBS) were collected in 2010-2016 from three hospitals in a region of central Italy. Fluoroquinolone (FQ)-resistant isolates were selected using levofloxacin. Levofloxacin-resistant (LR) strains (11/368, 2.99%) were characterized for several features, and their FQ resistance was analyzed phenotypically and genotypically using seven additional FQs. Their gyrA and parC quinolone resistance-determining regions were sequenced...
August 7, 2017: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
https://www.readbyqxmd.com/read/28781832/acute-suppurative-thyroiditis-caused-by-streptococcus-agalactiae-infection-a-case-report
#5
Nobuhiro Akuzawa, Toru Yokota, Tsukasa Suzuki, Masahiko Kurabayashi
Acute suppurative thyroiditis is a serious disease; therefore, its diagnosis in the acute phase is important. Fine needle aspiration biopsy of the thyroid gland plays a pivotal role in the diagnosis of acute suppurative thyroiditis. Appropriate culture technique and optimal imaging modalities are also important for its diagnosis.
August 2017: Clinical Case Reports
https://www.readbyqxmd.com/read/28780090/within-herd-prevalence-thresholds-for-herd-level-detection-of-mastitis-pathogens-using-multiplex-real-time-pcr-in-bulk-tank-milk-samples
#6
J B Soltau, E Einax, K Klengel, J Katholm, K Failing, A Wehrend, K Donat
The objective of the study was to assess the value of quantitative multiplex real-time PCR examination of bulk tank milk samples for bovine mastitis pathogens as a tool for herd level diagnosis. Using a logistic regression model, this study is aimed at calculating the threshold level of the apparent within-herd prevalence as determined by quarter milk sample cultivation of all lactating cows, thus allowing the detection of a herd positive for a specific pathogen within certain probability levels. A total of 6,335 quarter milk samples were collected and cultured from 1,615 cows on 51 farms in Germany...
August 2, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28779876/detection-of-streptococcus-agalactiae-by-immunochromatography-with-group-b-streptococcus-specific-surface-immunogenic-protein-in-pregnant-women
#7
Yoko Takayama, Hidehito Matsui, Yuzuru Adachi, Shin Nihonyanagi, Tatsuhiko Wada, Junko Mochizuki, Nobuya Unno, Hideaki Hanaki
BACKGROUND: Infection with Streptococcus agalactiae (Group B streptococcus: GBS) is a significant cause of morbidity and mortality in neonates. Screening for GBS is mainly done by culture-based methods, but a reliable result may take several days to obtain and culture is difficult to perform at institutions without a laboratory. We evaluated an immunochromatography method for rapid detection of GBS-specific surface immunogenic protein (Sip) using anti-Sip monoclonal antibodies. MATERIALS AND METHODS: A total of 377 cervical and vaginal swabs collected during weeks 35-37 of gestation were inoculated into GBS medium F and incubated...
August 2, 2017: Journal of Infection and Chemotherapy: Official Journal of the Japan Society of Chemotherapy
https://www.readbyqxmd.com/read/28768998/synthesis-and-biological-evaluation-of-novel-thioether-pleuromutilin-derivatives
#8
Shuhua Mu, Huixian Liu, Lifang Zhang, Xiaoyang Wang, Feiqun Xue, Yue Zhang
To develop new pleuromutilin derivatives as veterinary antibiotic medicines, we designed and synthesized a series of new thioether pleuromutilin derivatives possessing acylthiazolyl moiety based on previously designed derivatives. The antibacterial properties of the prepared pleuromutilin derivatives were assessed in vitro by the broth dilution method against five kinds of bacteria and the mycoplasma Mycoplasma gallisepticum (MG). All of the tested compounds displayed moderate to good antibacterial activity to methicillin-sensitive Staphylococcus aureus (MSSA), methicillin-sensitive Staphylococcus epidermidis (MSSE), methicillin-resistant S...
2017: Biological & Pharmaceutical Bulletin
https://www.readbyqxmd.com/read/28767617/prevalence-of-group-b-streptococcus-in-pregnant-women-in-iran-a-systematic-review-and-meta-analysis
#9
Mohammad Emaneini, Fereshteh Jabalameli, Willem B van Leeuwen, Reza Beigverdi
BACKGROUND: Group B Streptococcus (GBS or S. agalactiae) is a major cause of severe disease in neonates. In perinatal infections or early-onset disease (EOD), GBS is transmitted vertically to the newborn from the birth canal during labor and delivery. Limited information is available on the prevalence of GBS recto-vaginal colonization among pregnant women in Iran. METHODS: We performed a systematic search by using different electronic databases including: Medline (via Pubmed), Embase, Web of Science, and Iranian Database...
July 27, 2017: Pediatric Infectious Disease Journal
https://www.readbyqxmd.com/read/28764166/phytotherapy-in-streptococcusagalactiae-an-overview-of-the-medicinal-plants-effective-against-streptococcus-agalactiae
#10
REVIEW
Somayeh Delfani, Mahmoud Bahmani, Reza Mohammadrezaei-Khorramabadi, Mahmoud Rafieian-Kopaei
Streptococcus agalactiae is a spherical and Gram-positive bacterium that causes postpartum sepsis, endometritis, chorioamnionitis and premature delivery in pregnant women. The use of herbs and natural ingredients for the treatment of various disorders has been common. The present review is a report on the medicinal plants with anti-Streptococcus agalactiae effects. In this review, the search was carried out in Web of Science, PubMed, Scopus, Google Scholar and Science direct by keywords such as bacteria, Streptococcus agalactiae and medicinal plants...
June 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28763075/-group-b-streptococcal-perinatal-infection-a-global-latin-american-and-mexican-overview
#11
Gerardo C Palacios-Saucedo, Talyha Itzel Hernández-Hernández, Lydia Guadalupe Rivera-Morales, Evangelina Briones-Lara, Amílcar Caballero-Trejo, José M Vázquez-Guillén, Gustavo I Amador-Patiño, Ricardo García-Cabello, Fortino Solórzano-Santos, Cristina Rodríguez-Padillacs
Group B streptococci (Streptococcus agalactiae) cause a number of infections in women during pregnancy and postpartum, such as urinary tract infection, chorioamnionitis and endometritis, consequently may affect the newborn. Group B streptococci is the most common cause of severe infections in newborns in developed countries. Studies on the epidemiology of group B streptococci infections in Latin America are still limited. This information is also unknown in Mexico, but studies carried out in the center of the country have found high rates of vaginal colonization in pregnant women and there are case series and case reports of newborns...
May 2017: Gaceta Médica de México
https://www.readbyqxmd.com/read/28758124/the-analysis-of-etiology-and-risk-factors-for-192-cases-of-neonatal-sepsis
#12
Ting Xiao, Li-Ping Chen, Hui Liu, SiSi Xie, Yan Luo, Ding-Chang Wu
This study aimed to investigate the etiology and risk factors of neonatal sepsis. A retrospective analysis was conducted on 192 patients with sepsis from August 2013 to March 2015. One hundred and six healthy neonates were used as the control group. Logistic regression was used to analyze the risk factors and ROC curve analysis performed in laboratory which indicated a significant correlation. The results of univariate analysis showed that postnatal age, body weight, and parity were significantly related to neonatal sepsis (P < 0...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28757508/in-vitro-synergistic-activities-of-cefazolin-and-nisin-a-against-mastitis-pathogens
#13
Kohei Kitazaki, Shoko Koga, Kohei Nagatoshi, Koichi Kuwano, Takeshi Zendo, Jiro Nakayama, Kenji Sonomoto, Hitoshi Ano, Hiromu Katamoto
First-generation cephalosporins such as cefazolin (CEZ) have been widely used for mastitis treatment in dairy cattle. However, the use of antibiotics results in the presence of antibiotic residues in milk, which is used for human consumption. Nisin A, a bacteriocin produced by Lactococcus lactis, has been used as a broad-spectrum food preservative for over 50 years. Therefore, a combination of CEZ and nisin A might provide an extended activity spectrum against mastitis pathogens and reduce the antibiotic dose for mastitis treatment...
July 29, 2017: Journal of Veterinary Medical Science
https://www.readbyqxmd.com/read/28757159/effectivity-of-oral-recombinant-dna-vaccine-against-streptococcus-agalactiae-in-nile-tilapia
#14
Ling Zhu, Qian Yang, Lingyuan Huang, Kaiyu Wang, Xingli Wang, Defang Chen, Yi Geng, Xiaoli Huang, Ping Ouyang, Weimin Lai
The effects of oral vaccination by two immune routes (gavage and mixed fodder administration) using a recombinant DNA vaccine SL7207-pVAX1-sip against Streptococcus agalactiae were assessed. SL7207-pVAX1-sip significantly enhanced various innate immune responses of tilapia, such as total serum protein, superoxide dismutase activity, lysozyme activity, complement C3 concentration in serum, serum antibacterial activity, and interleukin 1β and tumor necrosis factor-α. Vaccinated fish had higher relative percent survival values (57% and 63% for gavage group and mix fodder administration, respectively) at 10 weeks after S...
July 28, 2017: Developmental and Comparative Immunology
https://www.readbyqxmd.com/read/28757019/genomic-comparison-of-virulent-and-non-virulent-serotype-v-st1-streptococcus-agalactiae-in-fish
#15
Rui Wang, Li-Ping Li, Ting Huang, Ai-Ying Lei, Yan Huang, Fu-Guang Luo, Dong-Ying Wang, Wei-Yi Huang, Ming Chen, Jun Huang
Streptococcus agalactiae or Group B Streptococcus (GBS) is the major pathogen causing pneumonia and meningitis in human, mastitis in dairy cows, and streptococcal disease in tilapia. Previous studies have shown that fish GBS strains are correlated with human GBS strains in evolution and might have cross-host infection ability. Although the invasive disease caused by ST1 GBS in non-pregnant adults and cows is increasing worldwide, infection of fish by ST1 GBS has not been reported. The aim of this study was to determine whether ST1 GBS was virulent in fish and to investigate the genomic characteristics of ST1 GBS strains with different pathogenicity in tilapia...
August 2017: Veterinary Microbiology
https://www.readbyqxmd.com/read/28747586/a-novel-probiotic-bacillus-siamensis-b44v-isolated-from-thai-pickled-vegetables-phak-dong-for-potential-use-as-a-feed-supplement-in-aquaculture
#16
Ratchanu Meidong, Sompong Doolgindachbaporn, Winai Jamjan, Kenji Sakai, Yukihiro Tashiro, Yuki Okugawa, Saowanit Tongpim
The use of probiotic bacteria to control bacterial infection in farmed fish is of clear practical interest. The aims of this study were to isolate and select a probiotic Bacillus sp. and to evaluate the effects of its supplementation on the growth and disease resistance of hybrid catfish. Bacillus siamensis strain B44v, selectively isolated from Thai pickled vegetables (Phak-dong), displayed a high potential as a probiotic in catfish culture. This bacterium produced a bacteriocin-like substance and exhibited a broad-spectrum antibacterial activity inhibiting both Gram-positive and Gram-negative bacteria, especially the fish pathogens Aeromonas hydrophila and Streptococcus agalactiae...
July 27, 2017: Journal of General and Applied Microbiology
https://www.readbyqxmd.com/read/28745405/streptococcus-agalactiae-multilocus-sequence-type-261-is-associated-with-mortalities-in-the-emerging-ghanaian-tilapia-industry
#17
D W Verner-Jeffreys, T J Wallis, I Cano Cejas, D Ryder, D J Haydon, J F Domazoro, J Dontwi, T R Field, D Adjei-Boteng, G Wood, T Bean, S W Feist
No abstract text is available yet for this article.
July 26, 2017: Journal of Fish Diseases
https://www.readbyqxmd.com/read/28735311/erythromycin-or-clindamycin-is-it-still-an-empirical-therapy-against-streptococcus-agalactiae-in-patients-allergic-to-penicillin
#18
Piotr Leszczyński, Beata Sokół-Leszczyńska, Bronisława Pietrzak, Anna Sawicka-Grzelak, Mirosław Wielgoś
Retrospective analysis of Streptococcus agalactiae antibiotic susceptibility isolated in 2010-2013 was performed. Penicillin was still the first-line antibiotic. Due to the high percentage of strains resistant to erythromycin and clindamycin empirical treatment with these antibiotics may not be effective. Lower resistance rate to erythromycin and clindamycin among strains isolated from infected pregnant women and newborns were observed than among strains isolated from samples from patients hospitalized in other departments (29% and 47% v...
July 6, 2017: Polish Journal of Microbiology
https://www.readbyqxmd.com/read/28735051/telavancin-activity-in-vitro-tested-against-a-worldwide-collection-of-gram-positive-clinical-isolates-2014
#19
Leonard R Duncan, Helio S Sader, Jennifer I Smart, Robert K Flamm, Rodrigo E Mendes
OBJECTIVES: Telavancin activity was measured against Gram-positive pathogens collected worldwide during 2014 using the revised broth microdilution testing method. The results were compared with previous reports. METHODS: A total of 10 552 isolates from 86 sites located in 32 countries were included as part of the Telavancin International Surveillance Program for the Americas, Europe and Asia-Pacific. RESULTS: Telavancin had MIC50 and MIC90 values of 0...
July 19, 2017: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/28733150/seven-new-lignan-glycosides-from-the-branches-of-alangium-kurzii-craib-var-laxifolium
#20
Jie Ren, Yang-Guo Xie, Ying-Ying Huang, Sheng-Lan Zhu, Shi-Kai Yan, Hui-Zi Jin, Wei-Dong Zhang
Seven new lignan glycosides (1-3, 8-10, and 14) and 17 known compounds were isolated from the branches of Alangium kurzii Craib var. laxifolium. Their structures were established by spectroscopic analysis and circular dichroism (CD) and X-ray analysis. The isolated compounds were evaluated for their antibacterial activities against Staphylococcus aureus CI1011, Streptococcus suis CI1608, Salmonella gallinarum CI0912, Enterococcus faecalis CI1304, Aeromonas hydrophila CI1008, Escherichia coli CI151012, Vibrio parahaemolyticus CI150506, Klebsiella pneumoniae CI131216, Pseudomonas aeruginosa CI1011, Staphylococcus epidermidis CI1110, and Streptococcus agalactiae CI1302...
July 19, 2017: Fitoterapia
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