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https://www.readbyqxmd.com/read/28636788/role-of-positively-charged-residues-on-the-polar-and-non-polar-faces-of-amphipathic-%C3%AE-helical-antimicrobial-peptides-amps-on-specificity-and-selectivity-for-gram-negative-pathogens
#1
Ziqing Jiang, Colin T Mant, Michael Vasil, Robert S Hodges
We have designed de novo and synthesized eight 26-residue all D-conformation amphipathic α-helical cationic antimicrobial peptides (AMPs), four with "specificity determinants" which provide specificity for prokaryotic cells over eukaryotic cells and four AMPs without specificity determinants. The eight AMPs contain six positively charged Lys residues on the polar face in four different arrangements to understand the role of these residues have on antimicrobial activity against 14 Acinetobacter baumannii strains, 7 of which were resistant to polymyxin B and colistin; 6 diverse Pseudomonas aeruginosa strains and 17 Staphylococcus aureus strains, 9 of which were Methicillin-sensitive (MSSA) and 8 of which were Methicillin-resistant (MRSA)...
June 21, 2017: Chemical Biology & Drug Design
https://www.readbyqxmd.com/read/28630196/antimicrobial-susceptibility-trends-among-staphylococcus-aureus-from-united-states-hospitals-results-from-7-years-of-the-ceftaroline-aware-surveillance-program-2010-2016
#2
Helio S Sader, Rodrigo E Mendes, Jennifer M Streit, Robert K Flamm
We evaluated trends in Staphylococcus aureus antimicrobial susceptibility in United States hospitals in the 2010-2016 period. A total of 21,056 clinical isolates from 42 medical centers were tested for susceptibility by broth microdilution methods. MRSA rates decreased from 50.0% (2010) to 42.2% (2016). Susceptibility to erythromycin, levofloxacin, and clindamycin increased slightly, whereas susceptibility to ceftaroline, trimethoprim-sulfamethoxazole, and tetracycline remained stable. Ceftaroline retained potent activity against MSSA and MRSA (97...
June 19, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28630189/in-vitro-activity-of-delafloxacin-and-microbiological-response-against-fluoroquinolone-susceptible-and-non-susceptible-s-aureus-isolates-from-two-phase-3-studies-of-acute-bacterial-skin-and-skin-structure-infections-absssi
#3
S McCurdy, L Lawrence, M Quintas, L Woosley, R Flamm, C Tseng, S Cammarata
Delafloxacin is an investigational anionic fluoroquinolone antibiotic with broad spectrum in vitro activity, including Gram-positive organisms, Gram-negative organisms, atypical organisms, and anaerobes. The in vitro activity of delafloxacin and percent microbiological response in subjects infected with fluoroquinolone susceptible and non-susceptible S. aureus isolates was determined from two global Phase 3 studies of delafloxacin versus vancomycin plus aztreonam in ABSSSI. Patients were enrolled in 23 countries predominately in the US but also Eastern Europe, South America and Asia...
June 19, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28629011/chitosan-nanoparticles-as-alternative-anti-staphylococci-agents-bactericidal-antibiofilm-and-antiadhesive-effects
#4
E M Costa, S Silva, S Vicente, C Neto, P M Castro, M Veiga, R Madureira, F Tavaria, M M Pintado
Chitosan is a biocompatible, bioactive, non-toxic polymer that due to these characteristics has been widely used as a carrier for targeted delivery of bioactive molecules. In recent years, and considering that chitosan has a strong antimicrobial potential, the scientific community's focus has shifted onto the possible antimicrobial activity of chitosan nanoparticles. With this in mind, the aim of this work was to produce low molecular weight chitosan nanoparticles, through the ionic gelation method and characterize their potential biological activity against three staphylococci (MSSA, MRSA and MRSE) in planktonic and sessile environments...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28615467/evaluation-of-the-bd-max%C3%A2-staphsr-assay-for-detecting-mrsa-and-mssa-in-eswab-collected-wound-samples
#5
Suzane Silbert, Alicia Gostnell, Carly Kubasek, Raymond Widen
Staphylococcus aureus (SA) is the most common pathogen involved in skin and soft tissue infections and it is the principal cause of surgical site infections (1, 2, 3).….
June 14, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28614287/nasal-swab-screening-for-staphylococcus-aureus-in-spinal-deformity-patients-treated-with-growing-rods
#6
Scott J Luhmann, June C Smith
BACKGROUND: Surgical-site infections are one of the most concerning complications in patients treated with growing rods (GR). The purpose of this study was to evaluate the use of preoperative screening for Staphylococcus aureus (SA) for all growing spine procedures, and if this would permit alteration of prophylactic antibiotics to cover the identified resistances. METHODS: All patients were identified who had SA screening during the course of GR treatment. In otal, 34 patients [23 neuromuscular (NMS), 4 congenital, 4 idiopathic scoliosis (IS), and 3 syndromic] were identified who had 111 preoperative screenings [79 lengthenings, 23 insertions, 6 revisions, and 3 conversions to posterior spinal fusions (PSF)]...
June 13, 2017: Journal of Pediatric Orthopedics
https://www.readbyqxmd.com/read/28598316/how-do-the-epidemiology-of-paediatric-methicillin-resistant-staphylococcus-aureus-and-methicillin-susceptible-staphylococcus-aureus-bacteraemia-differ
#7
Julia Abernethy, Mike Sharland, Alan P Johnson, Russell Hope
PURPOSE: To examine whether the epidemiology of bacteraemia caused by methicillin-susceptible Staphylococcus aureus (MSSA) and methicillin-resistant S. aureus (MRSA) differed in children aged <1 year and in comparison to older age groups. METHODOLOGY: English mandatory MRSA and MSSA surveillance data from 2006 and 2011, respectively, were collected. Epidemiological information was descriptively analysed in relation to methicillin susceptibility and patient age...
June 9, 2017: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/28595057/hospitalization-cost-at-childbirth-health-parameters-and-colonization-with-antimicrobial-resistant-bacteria-and-methicillin-susceptible-staphylococcus-aureus
#8
Alexandra C Adler, Mihai Zamfir, Lana Hendrowarsito, Antchen Dammeyer, Lasse Schomacher, Barbara Karlin, Manuela Franitza, Lilia Nasri, Stefan Hörmansdorfer, Christian Tuschak, Giuseppe Valenza, Thomas Ewert, Wolfgang Hierl, Uta Ochmann, Caroline Herr, Stefanie Heinze
OBJECTIVE: Antimicrobial resistant bacteria (AMR) are of public health and economic relevance. However, there is a lack of data regarding AMR colonization in pregnant women and in newborns. Furthermore, there are few studies analyzing hospital's net income (revenues and costs). STUDY DESIGN: The cross-sectional study took place in two Bavarian clinics. Available data regarding women and newborns were collected using a standardized questionnaire, personal IDs and medical records in addition to AMR/MSSA screening...
May 30, 2017: European Journal of Obstetrics, Gynecology, and Reproductive Biology
https://www.readbyqxmd.com/read/28593043/diffusion-of-clindamycin-resistant-and-erythromycin-resistant-methicillin-susceptible-staphylococcus-aureus-mssa-potential-st398-in-united-states-veterans-health-administration-hospitals-2003-2014
#9
Margaret Carrel, Michihiko Goto, Marin L Schweizer, Michael Z David, Daniel Livorsi, Eli N Perencevich
BACKGROUND: Changing phenotypic profiles of methicillin-susceptible Staphylococcus aureus (MSSA) isolates can indicate the emergence of novel sequence types (ST). The diffusion of MSSA ST can be tracked by combining established genotypic profiles with phenotypic surveillance data. ST398 emerged in New York City (NYC) and exhibits resistance to clindamycin and erythromycin but tetracycline susceptibility ("potential ST398"). Trends of potential ST398 were examined in a national cohort of all Veterans Health Administration patients with MSSA invasive infections during 2003-2014...
2017: Antimicrobial Resistance and Infection Control
https://www.readbyqxmd.com/read/28592549/emergence-of-a-staphylococcus-aureus-clone-resistant-to-mupirocin-and-fusidic-acid-carrying-exotoxin-genes-and-causing-mainly-skin-infections
#10
Anastassios Doudoulakakis, Iris Spiliopoulou, Nikolaos Spyridis, Nikolaos Giormezis, John Kopsidas, Maria Militsopoulou, Evangelia Lebessi, Maria Tsolia
Objectives: Skin and soft tissue infections (SSTIs) caused by mupirocin-resistant Staphylococcus aureus strains have recently increased in our settings. We sought to evaluate the characteristics of these cases over a 43-month period.Methods: All community-acquired staphylococcal infections caused by mupirocin-resistant strains were retrospectively reviewed. Genes encoding high level (HLR) mupirocin resistance (mupA), fusidic acid resistance (fusB), ermA, ermC, PVL (lukS/lukF-PV), exfoliative toxins (eta, etb), fibronectin binding protein A (fnbA) were investigated in 102 preserved selected strains by PCRs...
June 7, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28592371/low-yield-of-blood-and-wound-cultures-in-patients-with-skin-and-soft-tissue-infections
#11
Jesus Torres, Nathaniel Avalos, Lamarr Echols, Jillian Mongelluzzo, Robert M Rodriguez
BACKGROUND: Current guidelines recommend blood cultures in skin and soft-tissue infection (SSTI) patients only with signs of systemic toxicity and wound cultures for severe purulent infections. Our objectives were to determine: 1) blood and wound culture yields in patients admitted with SSTIs; 2) whether injection drug users (IDUs) and febrile patients had higher blood culture yields; and 3) whether blood and wound cultures grew organisms sensitive to typical SSTI empiric antibiotics...
May 26, 2017: American Journal of Emergency Medicine
https://www.readbyqxmd.com/read/28592231/high-burden-of-complicated-skin-and-soft-tissue-infections-in-the-indigenous-population-of-central-australia-due-to-dominant-panton-valentine-leucocidin-clones-st93-mrsa-and-cc121-mssa
#12
Susan A J Harch, Eleanor MacMorran, Steven Y C Tong, Deborah C Holt, Judith Wilson, Eugene Athan, Saliya Hewagama
BACKGROUND: Superficial skin and soft tissue infections (SSTIs) are common among the Indigenous population of the desert regions of Central Australia. However, the overall burden of disease and molecular epidemiology of Staphylococcus aureus complicated SSTIs has yet to be described in this unique population. METHODS: Alice Springs Hospital (ASH) admission data was interrogated to establish the population incidence of SSTIs. A prospective observational study was conducted on a subset of S...
June 7, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28587320/distribution-characteristics-of-staphylococcus-spp-in-different-phases-of-periprosthetic-joint-infection-a-review
#13
Geyong Guo, Jiaxing Wang, Yanan You, Jiaqi Tan, Hao Shen
Periprosthetic joint infection (PJI) is a devastating condition and Staphylococcus spp. are the predominant pathogens responsible, particularly coagulase-negative staphylococci (CoNS) and Staphylococcus aureus. The aim of the present systematic review was to evaluate the distribution characteristics of specific Staphylococcus spp. in different PJI phases, reveal the effect of pathogens' feature on their distribution and suggest recommendations for antibiotic treatment of Staphylococcal PJI. The present systematic review was performed using PubMed and EMBASE databases with the aim to identify existing literature that presented the spectrum of Staphylococcus spp...
June 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28580804/burden-of-antimicrobial-resistance-in-an-era-of-decreasing-susceptibility
#14
Glenn S Tillotson, Stephen H Zinner
Antimicrobial resistance has become a global problem. Many pathogens are becoming multidrug-resistant with the attendant increased risk of failure of standard therapies and the under-recognised outcomes such as increased morbidity, mortality, length of hospitalization and costs of treatment. Areas covered: We undertook a review of the literature using standard search engines including PubMed, Google Scholar, Scopus and internet sources. Key search terms included antimicrobial resistance, antibiotic resistance, bacterial resistance, clinical outcomes, economic consequences, Escherichia coli, Pseudomonas aeruginosa, Klebsiella pneumoniae, Streptococcus pneumoniae and Staphylococcus aureus...
June 13, 2017: Expert Review of Anti-infective Therapy
https://www.readbyqxmd.com/read/28576711/safety-and-efficacy-of-antibacterial-prophylaxis-after-craniotomy-a-decision-model-analysis
#15
Amal F Alotaibi, Rania A Mekary, Hasan A Zaidi, Timothy R Smith, Ankur Pandya
BACKGROUND: Antibiotic prophylaxis has revolutionized the safety of neurosurgical procedures in the last century. Today, the clinician's drug of choice prior surgery is often based on the antibiotic's resistance profile and drug-induced complications. METHODS: A decision tree model was developed to compare cefazolin (cephalosporin), vancomycin, or their combination on 90-day mortality post-craniotomy. We modeled the infection type (methicillin-sensitive, methicillin-resistant, or other organisms), antibiotic-related complications that could affect mortality (e...
May 30, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28575438/molecular-characterization-of-staphylococcus-aureus-isolates-from-children-with-periorbital-or-orbital-cellulitis
#16
Catherine E Foster, Elizabeth Yarotsky, Edward O Mason, Sheldon L Kaplan, Kristina G Hulten
Background.: Periorbital and orbital cellulitis cause significant pediatric morbidity. Here, we define the clinical features of and characterize isolates from children with periorbital or orbital cellulitis caused by Staphylococcus aureus at Texas Children's Hospital in Houston. Methods.: Patients were identified from a prospective S aureus study database from January 2002 to July 2015. Demographic and clinical data were collected retrospectively. Isolates were genotyped by pulsed-field gel electrophoresis, and Panton-Valentine leukocidin (lukSF-PV [pvl]) genes were detected by quantitative polymerase chain reaction...
June 1, 2017: Journal of the Pediatric Infectious Diseases Society
https://www.readbyqxmd.com/read/28575112/molecular-epidemiology-of-staphylococcus-aureus-bacteremia-in-a-single-large-minnesota-medical-center-in-2015-as-assessed-using-mlst-core-genome-mlst-and-spa-typing
#17
Kyung-Hwa Park, Kerryl E Greenwood-Quaintance, James R Uhl, Scott A Cunningham, Nicholas Chia, Patricio R Jeraldo, Priya Sampathkumar, Heidi Nelson, Robin Patel
Staphylococcus aureus is a leading cause of bacteremia in hospitalized patients. Whether or not S. aureus bacteremia (SAB) is associated with clonality, implicating potential nosocomial transmission, has not, however, been investigated. Herein, we examined the epidemiology of SAB using whole genome sequencing (WGS). 152 SAB isolates collected over the course of 2015 at a single large Minnesota medical center were studied. Staphylococcus protein A (spa) typing was performed by PCR/Sanger sequencing; multilocus sequence typing (MLST) and core genome MLST (cgMLST) were determined by WGS...
2017: PloS One
https://www.readbyqxmd.com/read/28542601/the-epidemiology-of-staphylococcus-aureus-carriage-in-patients-attending-inner-city-sexually-transmitted-infections-and-community-clinics-in-calgary-canada
#18
Alejandra Ugarte Torres, Angel Chu, Ron Read, Judy MacDonald, Daniel Gregson, Thomas Louie, Johanna Delongchamp, Linda Ward, Joann McClure, Kunyan Zhang, John Conly
BACKGROUND: Although the nares represent the most common carriage site for traditional hospital-associated strains of Staphylococcus aureus (SA), the predominant site of carriage of SA in the community is less certain. METHODS: We conducted a cross-sectional study in 285 patients attending sexually transmitted diseases and inner-city clinics to evaluate the prevalence, body site colonisation and risk factors associated with carriage of methicillin susceptible SA (MSSA)...
2017: PloS One
https://www.readbyqxmd.com/read/28536702/in-vitro-evaluations-and-in-vivo-toxicity-and-efficacy-studies-of-mfm501-against-mrsa
#19
Saiful Azmi Johari, Mastura Mohtar, Sharifah Aminah Syed Mohamad, Mohd Fazli Mohammat, Rohana Sahdan, Azman Mohamed, Mohamad Jemain Mohamad Ridhwan
Previously we have discovered a synthetically derived pyrrolidone alkaloid, MFM501, exhibiting good inhibitory activity against 53 MRSA and MSSA isolates with low cytotoxicity against three normal cell-lines with IC50 values at >625 µg/ml. Time-kill assay, scanning electron microscopy (SEM) analysis, in vivo oral acute toxicity test, and mice peritonitis model were carried out in this study. In the time-kill study, MFM501 showed a less than 3 log10 decrease in bacterial colony concentration value (CFU/ml) which represented a bacteriostatic action while displaying a time-dependent inhibitory mechanism...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28507105/reduced-vancomycin-susceptibility-of-methicillin-susceptible-staphylococcus-aureus-no-significant-impact-on-mortality-but-increase-in-complicated-infection
#20
Sean B Sullivan, Eloise D Austin, Stephania Stump, Barun Mathema, Susan Whittier, Franklin D Lowy, Anne-Catrin Uhlemann
Methicillin-susceptible Staphylococcus aureus (MSSA) bloodstream infections (BSIs) often lead to severe complications despite the availability of effective antibiotics. It remains unclear whether elevated vancomycin MICs are associated with worse outcomes.We conducted a 2-year retrospective cohort study (n=252) of patients with MSSA BSIs at a tertiary care hospital. We defined reduced vancomycin susceptibility (RVS) as a Microscan MIC of 2 mg/L. All strains were genotyped (spa) and assessed for agr functionality...
May 15, 2017: Antimicrobial Agents and Chemotherapy
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