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https://www.readbyqxmd.com/read/29336909/-non-reported-spa-types-in-our-country-in-staphylococcus-aureus-from-adult-patients-of-a-school-hospital-santa-fe-argentina
#1
Carla Tomatis, María R Baroni, María A Mendosa, Alicia Nagel, Analia Mollerach, Claudia Alvarez, Maria Laura Zurbriggen, Sabrina Cristobal, Glenda Segovia, Emilce de Los A Méndez
Staphylococcus aureus is a pathogen associated a different kind of infection. Molecular markers are useful tools to study microbial epidemiology. Twenty two methicillin-resistant S. aureus (MRSA) and 23 methicillin-susceptible S. aureus (MSSA) were studied by mecA gene, SCCmec cassette, Panton Valentine leucocidin (PVL) and spa polymorphism. The clinical data patients were analyzed. MSSA was prevalent in samples different from skin and soft tissue (SST) and in hospitalized patients, whereas MRSA in SST. SCCmec type IV was predominant, followed by type I...
January 11, 2018: Revista Argentina de Microbiología
https://www.readbyqxmd.com/read/29330346/underestimation-of-staphylococcus-aureus-mrsa-and-mssa-carriage-associated-with-standard-culturing-techniques-one-third-of-carriers-missed
#2
S T J Tsang, M P McHugh, D Guerendiain, P J Gwynne, J Boyd, A H R W Simpson, T S Walsh, I F Laurenson, K E Templeton
OBJECTIVES: Nasal carriers of Staphylococcus (S.) aureus (MRSA and MSSA) have an increased risk for healthcare-associated infections. There are currently limited national screening policies for the detection of S. aureus despite the World Health Organization's recommendations. This study aimed to evaluate the diagnostic performance of molecular and culture techniques in S. aureus screening, determine the cause of any discrepancy between the diagnostic techniques, and model the potential effect of different diagnostic techniques on S...
January 2018: Bone & Joint Research
https://www.readbyqxmd.com/read/29325865/emerging-discrepancies-in-conventional-and-molecular-epidemiology-of-methicillin-resistant-staph-aureus-isolated-from-bovine-milk
#3
Amjad Islam Aqib, Muhammad Ijaz, Shahid Hussain Farooqi, Rais Ahmed, Muhammad Shoaib, Muhammad Muddassir Ali, Khalid Mehmood, Hui Zhang
Methicillin resistant Staph aureus (MRSA) is an emerging public health concern from dairy milk, and its diagnosis by phenotypic methodology is experiencing higher discrepancies. The present study was planned to estimate discrepancies in phenotypic identification of MRSA and MSSA (Methicillin sensitive Staph aureus) in relation to mecA, and prevalent risk factors from various localities. In-vitro oxacilline antibiotic disks were used for phenotypic identification of MRSA, whereas mecA gene was used as MRSA marker in Staph aureus by PCR...
January 8, 2018: Microbial Pathogenesis
https://www.readbyqxmd.com/read/29320769/electronic-nose-in-the-detection-of-wound-infection-bacteria-from-bacterial-cultures-a-proof-of-principle-study
#4
Taavi Saviauk, Juha P Kiiski, Maarit K Nieminen, Nelly N Tamminen, Antti N Roine, Pekka S Kumpulainen, Lauri J Hokkinen, Markus T Karjalainen, Risto E Vuento, Janne J Aittoniemi, Terho J Lehtimäki, Niku K Oksala
BACKGROUND: Soft tissue infections, including postoperative wound infections, result in a significant burden for modern society. Rapid diagnosis of wound infections is based on bacterial stains, cultures, and polymerase chain reaction assays, and the results are available earliest after several hours, but more often not until days after. Therefore, antibiotic treatment is often administered empirically without a specific diagnosis. METHODS: We employed our electronic nose (eNose) system for this proof-of-concept study, aiming to differentiate the most relevant bacteria causing wound infections utilizing a set of clinical bacterial cultures on identical blood culture dishes, and established bacterial lines from the gaseous headspace...
January 10, 2018: European Surgical Research. Europäische Chirurgische Forschung. Recherches Chirurgicales Européennes
https://www.readbyqxmd.com/read/29309899/management-of-bloodstream-infections-by-infection-specialists-an-international-escmid-cross-sectional-survey
#5
Kévin Diallo, Nathalie Thilly, Amandine Luc, Guillaume Beraud, Önder Ergonul, Maddalena Giannella, Diamantis Kofteridis, Tomislav Kostyanev, José Ramón Paňo-Pardo, Pilar Retamar, Winfried Kern, Céline Pulcini
BACKGROUND: Bloodstream infections (BSI) are frequent, but international guidelines are available only for MRSA and candidaemia. OBJECTIVES: Our objective was to explore the management of BSI by infection specialists. METHODS: This international ESCMID cross-sectional survey was opened from December 2016 to February 2017. All infection specialists, senior or trainees, giving at least weekly advice on positive blood cultures could participate...
January 5, 2018: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/29307750/methicillin-resistant-staphylococcus-aureus-has-greater-risk-of-transmission-in-the-operating-room-than-methicillin-sensitive-s-aureus
#6
Randy W Loftus, Franklin Dexter, Alysha D M Robinson
BACKGROUND: Methicillin-resistant Staphylococcus aureus (MRSA) is a pathogenic S aureus strain characteristic associated with increased patient morbidity and mortality. The health care system needs to understand MRSA transmissibility in all settings to improve basic preventive measures to generate sustained reductions in invasive MRSA infections. Our primary aim was to compare intraoperative transmissibility of MRSA versus methicillin-sensitive S aureus (MSSA) isolates. METHODS: S aureus isolates (N = 173) collected from 274 randomly selected operating room environments (first and second case of the day in each operating room, a case pair) at 3 hospitals underwent systematic-phenotypic and genomic processing to identify clonally related transmission events...
January 4, 2018: American Journal of Infection Control
https://www.readbyqxmd.com/read/29305961/no-effect-of-vancomycin-mic-%C3%A2-1-5-mg-l-on-treatment-outcome-in-methicillin-susceptible-staphylococcus-aureus-bacteremia
#7
Kevin Bouiller, Caroline Laborde, Serge Ludwig Aho, Didier Hocquet, André Pechinot, Vincent Le Moing, Xavier Bertrand, Lionel Piroth, Catherine Chirouze
OBJECTIVES: The vancomycin minimum inhibitory concentration (MIC) has been shown to affect the outcome of methicillin-susceptible Staphylococcus aureus (MSSA) bacteremia. In this study, the outcomes of patients with MSSA bacteremia, with a vancomycin MIC≥ 1.5 mg/L were assessed. METHODS: A prospective cohort of patients with MSSA bacteremia in two tertiary-care hospitals was collected. Vancomycin MIC was determined by Etest. SA strains were categorized as low (<1...
January 3, 2018: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/29304819/heavy-metal-exposure-and-nasal-staphylococcus-aureus-colonization-analysis-of-the-national-health-and-nutrition-examination-survey-nhanes
#8
Shoshannah Eggers, Nasia Safdar, Kristen Mc Malecki
BACKGROUND: Heavy metals including lead and cadmium can disrupt the immune system and the human microbiota. and are increasingly of concern with respect to the propogation of antibiotic-resistence. Infection by methicillin-resistant Staphylococcus aureus (MRSA) is a major cause of global morbidity and mortality. Heavy metal exposure may be associated with increased MRSA colonization and infection, and a decrease in methicillin-susceptible Staphylococcus aureus (MSSA) through co-selection mechanisms and natural selection of antibiotic resistance in the presence of heavy metals...
January 5, 2018: Environmental Health: a Global Access Science Source
https://www.readbyqxmd.com/read/29288646/bacteria-induce-autophagy-in-a-human-ocular-surface-cell-line
#9
Kimberly M Brothers, Regis P Kowalski, Shenghe Tian, Paul R Kinchington, Robert M Q Shanks
Autophagy protects cells from intracellular pathogens, but can be exploited by some infectious agents to their benefit. Currently it is not known if bacteria induce autohpagy in cells of the cornea. The goal of this study was to develop an ocular surface autophagy reporter cell line and determine whether ocular bacterial pathogens influence host responses through autophagy induction. The cell line was made using lentivirus transduction of an LC3-GFP fusion protein in human corneal limbal epithelial (HCLE) cells...
December 27, 2017: Experimental Eye Research
https://www.readbyqxmd.com/read/29287356/multifunctions-of-pleurotus-sajor-caju-fr-singer-a-highly-nutritious-food-and-a-source-for-bioactive-compounds
#10
Tiane C Finimundy, Lillian Barros, Ricardo C Calhelha, Maria José Alves, Miguel A Prieto, Rui M V Abreu, Aldo J P Dillon, João A P Henriques, Mariana Roesch-Ely, Isabel C F R Ferreira
A study with Pleurotus sajor-caju was conducted to: evaluate the nutritional and chemical composition of the fruiting bodies; optimize the preparation of bioactive phenolic extracts; and characterize the optimized extract in terms of bioactive compounds and properties. P. sajor-caju revealed an equilibrated nutritional composition with the presence of hydrophilic (sugars and organic acids) and lipophilic (tocopherols and PUFA) compounds. p-Hydroxybenzoic, p-coumaric and cinnamic acids were identified in the extract obtained with ethanol (30g/l ratio) at 55°C for 85min...
April 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29273750/elimination-of-antibiotic-resistant-surgical-implant-biofilms-using-an-engineered-cationic-amphipathic-peptide-wlbu2
#11
Jonathan B Mandell, Berthony Deslouches, Ronald C Montelaro, Robert M Q Shanks, Yohei Doi, Kenneth L Urish
Antibiotics are unable to remove biofilms from surgical implants. This high antibiotic tolerance is related to bacterial persisters, a sub-population of bacteria phenotypically tolerant to antibiotics secondary to a reduced metabolic state. WLBU2 is an engineered cationic amphipathic peptide designed to maximize antimicrobial activity with minimal mammalian cell toxicity. The objective of this study was to test the ability of WLBU2 to remove Staphylococcus aureus surgical implant biofilms. WLBU2 effectively treated S...
December 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29247432/antimicrobial-photodynamic-therapy-a-promising-treatment-for-prosthetic-joint-infections
#12
Timothy Briggs, Gordon Blunn, Simon Hislop, Rita Ramalhete, Caroline Bagley, David McKenna, Melanie Coathup
Periprosthetic joint infection (PJI) is associated with high patient morbidity and a large financial cost. This study investigated Photodynamic Therapy (PDT) as a means of eradicating bacteria that cause PJI, using a laser with a 665-nm wavelength and methylene blue (MB) as the photosensitizer. The effectiveness of MB concentration on the growth inhibition of methicillin-sensitive Staphylococcus aureus (MSSA), methicillin-resistant Staphylococcus aureus (MRSA), Staphylococcus epidermidis, Pseudomonas aeruginosa and Acinetobacter baumannii was investigated...
December 15, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/29246634/genetics-of-bi-component-leukocidin-and-drug-resistance-in-nasal-and-clinical-staphylococcus-aureus-in-lagos-nigeria
#13
Nkechi V Enwuru, Solayide A Adesida, Christian A Enwuru, Beniam Ghebremedhin, Udoma E Mendie, Akitoye O Coker
BACKGROUND: Resistant and virulent Staphylococcus aureus is a global public health challenge. Staphylococcal Bi-component leukotoxins are cytolytic to immune cells and evolve to disarm the innate immunity during infections, hence the severity of the disease. OBJECTIVE: We studied drug resistance profile and the occurrence of bi-component leukocidin in clinical and nasal S. aureus in Lagos, Nigeria. METHOD: Ninety-two S. aureus (70 clinical and 22 nasal) strains were characterized by conventional and molecular methods...
December 12, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/29243921/extra-sugar-on-vancomycin-new-analogues-for-combating-multidrug-resistant-staphylococcus-aureus-and-vancomycin-resistant-enterococci
#14
Dongliang Guan, Feifei Chen, Lun Xiong, Feng Tang, Faridoon Faridoon, Yunguang Qiu, Naixia Zhang, Likun Gong, Jian Li, Lefu Lan, Wei Huang
Lipophilic substitution on vancomycin is an effective strategy for development of novel vancomycin analogues against drug-resistant bacteria by enhancing bacterial cell wall interaction. However, hydrophobic structures usually led to long elimination half-life and accumulative toxicity, therefore hydrophilic fragments were also introduced to the lipo-vancomycin to regulate their PK/PD properties. Here, we synthesized a series of new vancomycin analogues carrying various sugar moieties on the 7th-amino acid phenyl ring and lipophilic substitutions on vancosamine with extensive SAR analysis...
December 15, 2017: Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29228127/antibiotic-resistance-and-the-risk-of-recurrent-bacteremia
#15
Sjoukje H S Woudt, Sabine C de Greeff, Annelot F Schoffelen, Anne L M Vlek, Marc J M Bonten
Background: Direct health effects of antibiotic resistance are difficult to assess. We quantified the risk of recurrent bacteremia associated with antibiotic resistance. Methods: We extracted antimicrobial susceptibility testing data on blood isolates of Enterobacteriaceae, Pseudomonas spp., Enterococcus spp. and Staphylococcus aureus from the Dutch surveillance system for antimicrobial resistance between 2008 and 2017. First and first recurrent (4-30days) bacteremia episodes were categorized as susceptible, single non-susceptible or co-non-susceptible (I/R), to 3rd generation cephalosporins -/+ carbapenems (Enterobacteriaceae), ceftazidime -/+ carbapenems (Pseudomonas spp...
December 7, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/29216563/synthesis-and-antimicrobial-activity-of-amino-acid-and-peptide-derivatives-of-mycophenolic-acid
#16
Agnieszka Siebert, Magdalena Wysocka, Beata Krawczyk, Grzegorz Cholewiński, Janusz Rachoń
The series of 16 novel amino acid and peptide mycophenolic acid (MPA) derivatives was obtained as potential antibacterial agents. Coupling of MPA with respective amines was optimized with condensing reagents such as EDCI/DMAP and T3P/TEA. Amino acid analogs were received both as methyl esters and also with the free carboxylic group. The biological activity of the products was tested on five references bacterial strains: Klebsiella pneumoniae ATCC 700603 (ESBL), Escherichia coli ATCC 8739, Pseudomonas aeruginosa ATCC 27853, Staphylococcus aureus MRSA ATCC 43300, Staphylococcus aureus MSSA ATCC 25923...
January 1, 2018: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29204221/antibiotic-resistance-patterns-and-virulence-determinants-of-different-sccmec-and-pulsotypes-of-staphylococcus-aureus-isolated-from-a-major-hospital-in-ilam-iran
#17
REVIEW
Mehdi Abbasi, Majid BaseriSalehi, Nima Bahador, Morovat Taherikalani
Aims & Objectives: The aim of this study is to evaluate genetic relatedness, antibiotic resistance pattern, and virulence characteristics of different types of S. aureus isolated from air, surfaces, staff, and patients in a Public hospital in Ilam. Methods & Materials: A total of 88 of 140 staphylococci identified as S. aureus by conventional and molecular methods were used in this study. Isolate samples were obtained from surfaces, staff, patients, and hospital indoor air...
2017: Open Microbiology Journal
https://www.readbyqxmd.com/read/29201229/antimicrobial-resistance-and-prevalence-of-cvfb-sek-and-seq-genes-among-staphylococcus-aureus-isolates-from-paediatric-patients-with-bloodstream-infections
#18
Bing-Shao Liang, Yan-Mei Huang, Yin-Shuang Chen, Hui Dong, Jia-Liang Mai, Yong-Qiang Xie, Hua-Min Zhong, Qiu-Lian Deng, Yan Long, Yi-Yu Yang, Si-Tang Gong, Zhen-Wen Zhou
Staphylococcus aureus (S. aureus) is one of the most frequently isolated pathogens in neonatal cases of early and late-onset sepsis. Drug resistance profiles and carriage of toxin genes may affect the treatment and outcome of an infection. The present study aimed to determine the antimicrobial resistance patterns and frequencies of the toxin-associated genes conserved virulence factor B (CvfB), staphylococcal enterotoxin Q (SEQ) and staphylococcal enterotoxin K (SEK) among S. aureus isolates recovered from paediatric patients with bloodstream infections (BSIs) in Guangzhou (China)...
November 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/29198902/inoculum-effect-of-high-concentrations-of-methicillin-susceptible-staphylococcus-aureus-on-the-efficacy-of-cefazolin-and-other-beta-lactams
#19
Masachika Saeki, Masaaki Shinagawa, Yuki Yakuwa, Shinya Nirasawa, Yuki Sato, Nozomi Yanagihara, Satoshi Takahashi
The existence of a cefazolin inoculum effect (InE) of methicillin-susceptible Staphylococcus aureus (MSSA), which is speculated to be a reason for cefazolin treatment failure in MSSA infections, is controversial. In Japan, although cefazolin is one of the therapeutic choices for patients with MSSA infection, there are few reports of this effect. Additionally, the association between InE and blaZ type in beta-lactams other than cefazolin has not been well documented. In this study, we confirmed an MSSA InE in several beta-lactams, including cefazolin, and its relationship with blaZ, using 52 MSSA isolates from blood cultures...
November 30, 2017: Journal of Infection and Chemotherapy: Official Journal of the Japan Society of Chemotherapy
https://www.readbyqxmd.com/read/29197567/biologically-anchored-chitosan-gelatin-srhap-scaffold-fabricated-on-titanium-against-chronic-osteomyelitis-infection
#20
D Nancy, N Rajendran
The obstacles faced to treat chronic osteomyelitis infection clinically led to the search for an ideal biomaterial, resulted in combining two major aspects of bone tissue engineering namely surface modified metallic implant and polymer nanocomposite scaffold. In the present study Gelatin - Strontium incorporated Hydroxyapatite (SrHAP) forming HG scaffold, vancomycin loaded chitosan -gelatin polyelectrolyte complex incorporated gelatin-SrHAP, forming HV scaffolds (HV1-0.5wt% and HV2-1wt% vancomycin) were investigated...
November 29, 2017: International Journal of Biological Macromolecules
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