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Penicillin susceptible staphylococcus

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https://www.readbyqxmd.com/read/28412568/first-report-on-mrsa-cc398-recovered-from-wild-boars-in-the-north-of-portugal-are-we-facing-a-problem
#1
Margarida Sousa, Nuno Silva, Vera Manageiro, Sónia Ramos, António Coelho, David Gonçalves, Manuela Caniça, Carmen Torres, Gilberto Igrejas, Patrícia Poeta
The aim of the present study was to evaluate the resistance of Staphylococcus aureus recovered from wild boars, to analyze their genetic lineages, and to investigate the susceptibility to oxacillin. Samples from mouth and nose of 45 wild boars (Sus scrofa) were collected during hunt activity from November 2012 to January 2013 in the North of Portugal. S. aureus isolates were recovered from 30 of these samples (33%); one isolate/sample was further studied. The susceptibility of the isolates was tested by disk-diffusion test against 14 antimicrobial agents and minimal inhibitory concentration was used to test oxacillin according to EUCAST guidelines...
April 13, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28399856/factors-associated-with-staphylococcus-aureus-nasal-carriage-and-molecular-characteristics-among-the-general-population-at-a-medical-college-campus-in-guangzhou-south-china
#2
B J Chen, X Y Xie, L J Ni, X L Dai, Y Lu, X Q Wu, H Y Li, Y D Yao, S Y Huang
BACKGROUND: The nasal cavity is the main colonization site of Staphylococcus aureus (S. aureus) in human body. Nasal carriage may be a strong risk factor for some serious infection. There was still limited information about the nasal carriage for S. aureus in south China. METHODS: Sought to determine the prevalence and molecular characteristics of S. aureus nasal carriage, 295 volunteers residing on a medicine campus were investigated and sampled the nasal cavity swab...
April 11, 2017: Annals of Clinical Microbiology and Antimicrobials
https://www.readbyqxmd.com/read/28394942/evidence-for-the-evolutionary-steps-leading-to-meca-mediated-%C3%AE-lactam-resistance-in-staphylococci
#3
Joana Rolo, Peder Worning, Jesper Boye Nielsen, Rita Sobral, Rory Bowden, Ons Bouchami, Peter Damborg, Luca Guardabassi, Vincent Perreten, Henrik Westh, Alexander Tomasz, Hermínia de Lencastre, Maria Miragaia
The epidemiologically most important mechanism of antibiotic resistance in Staphylococcus aureus is associated with mecA-an acquired gene encoding an extra penicillin-binding protein (PBP2a) with low affinity to virtually all β-lactams. The introduction of mecA into the S. aureus chromosome has led to the emergence of methicillin-resistant S. aureus (MRSA) pandemics, responsible for high rates of mortality worldwide. Nonetheless, little is known regarding the origin and evolution of mecA. Different mecA homologues have been identified in species belonging to the Staphylococcus sciuri group representing the most primitive staphylococci...
April 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28386280/bacterial-isolates-and-their-antimicrobial-susceptibility-patterns-of-wound-infections-among-inpatients-and-outpatients-attending-the-university-of-gondar-referral-hospital-northwest-ethiopia
#4
Aynalem Mohammed, Mengistu Endris Seid, Teklay Gebrecherkos, Moges Tiruneh, Feleke Moges
Background. The widespread uses of antibiotics, together with the length of time over which they have been available, have led to the emergence of resistant bacterial pathogens contributing to morbidity and mortality. This study was aimed to assess bacterial isolates and their drug susceptibility patterns from inpatients and outpatients with pus and/or wound discharge. Methods. A cross-sectional study was conducted at the University of Gondar Referral Hospital from March to May, 2014. Wound swab samples were collected from each study participant and inoculated into appropriate media...
2017: International Journal of Microbiology
https://www.readbyqxmd.com/read/28373193/high-level-resistance-of-staphylococcus-aureus-to-%C3%AE-lactam-antibiotics-mediated-by-penicillin-binding-protein-4-pbp4
#5
Stephanie M Hamilton, J Andrew N Alexander, Eun Ju Choo, Li Basuino, Thaina M da Costa, Anatoly Severin, Marilyn Chung, Sandra Aedo, Natalie C J Strynadka, Alexander Tomasz, Som S Chatterjee, Henry F Chambers
PBP4, a non-essential, low molecular weight penicillin-binding protein of Staphylococcus aureus, has been implicated in low-level resistance to β-lactam antibiotics, although the mechanism is unknown. Mutations in PBP4 and its promoter were identified in a laboratory-generated mutant strain CRB, which expresses high-level resistance to β-lactams, including resistance to the new generation cephalosporins active against methicillin-resistant strains of S. aureus These mutations did not appreciably alter β-lactam antibiotic binding affinity of purified recombinant mutant PBP4 compared to wild-type...
April 3, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28359610/methicillin-resistant-staphylococcus-aureus-nasal-carriage-between-healthy-students-of-medical-and-nonmedical-universities
#6
Soleiman Abroo, Nima Hosseini Jazani, Yaeghob Sharifi
BACKGROUND: Methicillin-resistant Staphylococcus aureus (MRSA) is a challenge for public health, and community-acquired (CA) infections seem to be increasing among people in different areas. METHODS: A total of 700 healthy student volunteers residing in dormitories of universities in Urmia, Iran, were enrolled in this study. After identification of the isolates, antibiotic susceptibility, presence of mecA and pvl genes, and staphylococcal cassette chromosome mec (SCCmec) typing were evaluated...
March 27, 2017: American Journal of Infection Control
https://www.readbyqxmd.com/read/28351443/phenotypic-and-molecular-characteristics-of-staphylococcus-aureus-and-methicillin-resistant-staphylococcus-aureus-in-slaughterhouse-pig-related-workers-and-control-workers-in-guangdong-province-china
#7
X L Wang, L Li, S M Li, J Y Huang, Y P Fan, Z J Yao, X H Ye, S D Chen
Pig farmers and veterinarians have high prevalence of methicillin-resistant Staphylococcus aureus (MRSA) due to the occupational livestock exposure, while few reported this association on slaughterhouse workers. We conducted this cross-sectional study to explore the phenotypic and molecular characteristics of S. aureus and MRSA in slaughterhouse pig-related workers and control workers in Guangdong Province, China. Participants were interviewed and provided two nasal swabs. Swabs were tested for S. aureus, and isolates were further tested for antimicrobial susceptibility, virulence genes and multi-locus sequence typing...
March 29, 2017: Epidemiology and Infection
https://www.readbyqxmd.com/read/28342937/molecular-epidemiology-of-staphylococcus-aureus-nasal-colonization-among-patients-and-their-parents-guardian-in-an-iranian-referral-hospital
#8
Babak Pourakbari, Mahmoud Khodabandeh, Shima Mahmoudi, Farah Sabouni, Alireza Aziz-Ahari, Abbas Bahador, Sepideh Keshavarz Valian, Reihaneh Hosseinpour Sadeghi, Setareh Mamishi
INTRODUCTION: Carriage of Staphylococcus aureus in the nose appears to play a key role in the epidemiology and pathogenesis of infection. It is important to investigate the genetic relatedness of S. aureus and MRSA clones in different geographic regions. The aim of this study was to assess the nasal carriage rate of S. aureus, including MRSA strains in both hospitalized children and general adult population (parents/guardian). In addition, antibiotic susceptibility pattern and molecular diversity of S...
March 22, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28332157/systematic-overdosing-of-oxa-and-cloxacillin-in-severe-infections-treated-in-icu-risk-factors-and-side-effects
#9
Mathilde Neuville, Najoua El-Helali, Eric Magalhaes, Aguila Radjou, Roland Smonig, Jean-François Soubirou, Guillaume Voiriot, Alban Le Monnier, Stéphane Ruckly, Lila Bouadma, Romain Sonneville, Jean-François Timsit, Bruno Mourvillier
BACKGROUND: Oxacillin and cloxacillin are the most frequently used penicillins for the treatment of severe methicillin-susceptible Staphylococcus aureus infections in intensive care units (ICUs), especially endocarditis. International recommendations do not suggest any adaptation of the dosage in case of renal impairment. We wanted to assess the risk factors for overdosing in ICU and the related observed side effects. METHODS: All patients with a therapeutic drug monitoring of oxa- or cloxacillin between 2008 and 2014 were included...
December 2017: Annals of Intensive Care
https://www.readbyqxmd.com/read/28279787/implementation-of-a-cefazolin-based-stewardship-pathway-for-methicillin-susceptible-staphylococcus-aureus-bloodstream-infections-paired-with-infectious-diseases-consultation
#10
Benjamin J Lee, Sonia N Rao, Sheila K Wang, Jane Y Lee, Irfana Y Lakada, Elise M Gilbert, Viktorija O Barr, Michael J Postelnick, Sarah H Sutton, Teresa R Zembower, Maureen Bolon, Marc H Scheetz, Nathaniel J Rhodes
Methicillin-susceptible Staphylococcus aureus (MSSA) infections have been successfully treated both with cefazolin and antistaphylococcal penicillins; cefazolin appears effective in MSSA bloodstream infections (BSIs). Thus, our antimicrobial stewardship programme (ASP) implemented a clinical pathway supporting cefazolin use in MSSA-BSIs and restricting oxacillin use to infectious diseases (ID) consultation due to cefazolin's lower cost and more convenient dosing. This before and after quasi-experimental study was conducted to describe the impact on outcomes and process of care measures associated with implementing this pathway among patients with MSSA-BSI...
March 6, 2017: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/28276799/comparison-of-outcome-and-clinical-characteristics-of-bacteremia-caused-by-methicillin-resistant-penicillin-resistant-and-penicillin-susceptible-staphylococcus-aureus-strains
#11
COMPARATIVE STUDY
Elina Jokinen, Janne Laine, Reetta Huttunen, Pekka Rahikka, Heini Huhtala, Risto Vuento, Jaana Vuopio, Jaana Syrjänen
BACKGROUND: The aim of this study was to assess the association of methicillin resistance and penicillinase production with clinical characteristics and outcome of Staphylococcus aureus bacteremia. METHODS: For 126 patients with methicillin-resistant Staphylococcus aureus (MRSA) bacteremia, 378 age- and gender-matched controls with methicillin-susceptible Staphylococcus aureus (MSSA) bacteremia were selected. Of controls, 126 had bacteremia caused by penicillin-susceptible strains (PSSA) and 252 by penicillinase-producing strains (PRSA)...
July 2017: Infectious Diseases
https://www.readbyqxmd.com/read/28265972/the-safety-and-economic-impact-of-cefazolin-versus-nafcillin-for-the-treatment-of-methicillin-susceptible-staphylococcus-aureus-bloodstream-infections
#12
Lauren K Flynt, Rachel M Kenney, Marcus J Zervos, Susan L Davis
INTRODUCTION: Anti-staphylococcal penicillins are generally accepted as first-line therapy for methicillin-susceptible Staphylococcus aureus (MSSA) bacteremia, but their use may be limited by interstitial nephritis and acute kidney injury. Alternatives include first-generation cephalosporins including cefazolin. METHODS: We conducted a retrospective cohort study to compare adverse effects and clinical outcomes among patients with MSSA bacteremia treated with cefazolin or nafcillin...
March 6, 2017: Infectious Diseases and Therapy
https://www.readbyqxmd.com/read/28261176/nasopharyngeal-and-oropharyngeal-colonization-by-staphylococcus-aureus-and-streptococcus-pneumoniae-and-prognostic-markers-in-children-with-sickle-cell-disease-from-the-northeast-of-brazil
#13
Larissa C Rocha, Magda O S Carvalho, Valma M L Nascimento, Milena S Dos Santos, Tânia F Barros, Elisângela V Adorno, Joice N Reis, Caroline C da Guarda, Rayra P Santiago, Marilda de Souza Gonçalves
We investigated the nasopharynx and oropharynx microbiota in sickle cell disease (SCD) to identify the microorganisms, antibiotic sensitivity, prevalent serotypes, and association of with laboratorial markers. Oropharynx/nasopharynx secretions were investigated in 143 SCD children aging 6 months to 17 years. Pathogens were isolated using standard procedures, and laboratorial markers were performed by automated methods. Staphylococcus aureus (S. aureus) was isolated from nasopharynx and oropharynx of 64 and of 17 SCD children respectively...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28244296/bacterial-species-and-antibiotic-sensitivity-in-korean-patients-diagnosed-with-acute-otitis-media-and-otitis-media-with-effusion
#14
Sang Hoon Kim, Eun Ju Jeon, Seok Min Hong, Chang Hoon Bae, Ho Yun Lee, Moo Kyun Park, Jae Yong Byun, Myung Gu Kim, Seung Geun Yeo
Changes over time in pathogens and their antibiotic sensitivity resulting from the recent overuse and misuse of antibiotics in otitis media (OM) have complicated treatment. This study evaluated changes over 5 years in principal pathogens and their antibiotic sensitivity in patients in Korea diagnosed with acute OM (AOM) and OM with effusion (OME). The study population consisted of 683 patients who visited the outpatient department of otorhinolaryngology in 7 tertiary hospitals in Korea between January 2010 and May 2015 and were diagnosed with acute AOM or OME...
April 2017: Journal of Korean Medical Science
https://www.readbyqxmd.com/read/28223386/surveillance-of-omadacycline-activity-tested-against-clinical-isolates-from-a-global-north-america-europe-latin-america-and-asia-western-pacific-collection-2010-2011
#15
Michael A Pfaller, Michael D Huband, Paul R Rhomberg, Robert K Flamm
Omadacycline is a broad spectrum aminomethylcycline in late-stage clinical development for acute bacterial skin and skin structure infections and community-acquired pneumonia as both an oral and intravenous, once-daily formulation. In this report omadacycline and comparators were tested against 69,246 non-duplicate bacterial isolates collected prospectively during 2010 and 2011 from medical centers in Asia-Pacific (11,397 isolates), Europe (23,490 isolates), Latin America (8,038 isolates) and North America (26,321 isolates)...
February 21, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28164610/an-investigation-of-the-frequency-of-upper-respiratory-tract-infection-pathogens-and-their-antibiotic-patterns-in-tonsils-and-adenoids-of-adenotonsillectomy-patients
#16
Yasar Nakipoglu, Gulsen Gunel, Deniz Kanliada, Levent Aydemir, Nezahat Gurler, Bulent Gurler
BACKGROUND: We aimed to investigate the potentially pathogenic bacteria of upper respiratory tract infections (URTIs) and their susceptibilities to different antibiotics. METHODS: Two-hundred adenoid and tonsil specimens from 100 patients who had undergone adenotonsillectomy were obtained and analyzed bacteriologically. Identification of the pathogens was made by conventional or commercial identification systems and antibiotic susceptibility tests were carried out by disk diffusion method...
August 1, 2016: Clinical Laboratory
https://www.readbyqxmd.com/read/28159661/molecular-characteristics-of-methicillin-resistant-staphylococcus-aureus-mrsa-strains-isolated-from-patients-with-bacteremia-based-on-mlst-sccmec-spa-and-agr-locus-types-analysis
#17
Mehdi Goudarzi, Sima Sadat Seyedjavadi, Mohammad Javad Nasiri, Hossein Goudarzi, Raheleh Sajadi Nia, Hossein Dabiri
The widespread emergence of methicillin resistant Staphylococcus aureus, as a common cause of nosocomial infections, is becoming a serious concern in global public health. The objective of the present study was to investigate antimicrobial susceptibility pattern, frequency of virulence genes and molecular characteristics of methicillin-resistant Staphylococcus aureus strains isolated from patients with bacteremia. A total of 128 methicillin-resistant Staphylococcus aureus isolates were collected during February 2015 to January 2016...
March 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28148226/trends-in-antimicrobial-resistance-and-empiric-antibiotic-therapy-of-bloodstream-infections-at-a-general-hospital-in-mid-norway-a-prospective-observational-study
#18
Arne Mehl, Bjørn Olav Åsvold, Angela Kümmel, Stian Lydersen, Julie Paulsen, Ingvild Haugan, Erik Solligård, Jan Kristian Damås, Stig Harthug, Tom-Harald Edna
BACKGROUND: The occurrence of bloodstream infection (BSI) and antimicrobial resistance have been increasing in many countries. We studied trends in antimicrobial resistance and empiric antibiotic therapy at a medium-sized general hospital in Mid-Norway. METHODS: Between 2002 and 2013, 1995 prospectively recorded episodes of BSI in 1719 patients aged 16-99 years were included. We analyzed the antimicrobial non-susceptibility according to place of acquisition, site of infection, microbe group, and time period...
February 2, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28135900/penicillin-susceptible-staphylococcus-aureus-susceptibility-testing-resistance-rates-and-outcome-of-infection
#19
Malin Hagstrand Aldman, Annette Skovby, Lisa I Påhlman
BACKGROUND: Staphylococcus aureus (SA) is an important human pathogen that causes both superficial and invasive infections. Penicillin is now rarely used in the treatment of SA infections due to widespread resistance and a concern about the accuracy of existing methods for penicillin susceptibility testing. The aims of the present study were to determine the frequency of penicillin-susceptible SA isolates from blood and wound cultures in Lund, Sweden, and to evaluate methods for penicillin testing in SA...
June 2017: Infectious Diseases
https://www.readbyqxmd.com/read/28118725/synergistic-antibacterial-effects-of-herbal-extracts-and-antibiotics-on-methicillin-resistant-staphylococcus-aureus-a-computational-and-experimental-study
#20
Chiu-Fai Kuok, Sai-On Hoi, Chi-Fai Hoi, Chi-Hong Chan, Io-Hong Fong, Cheong-Kei Ngok, Li-Rong Meng, Pedro Fong
Antibiotic resistance has become a serious global concern, and the discovery of antimicrobial herbal constituents may provide valuable solutions to overcome the problem. In this study, the effects of therapies combining antibiotics and four medicinal herbs on methicillin-resistant Staphylococcus aureus (MRSA) were investigated. Specifically, the synergistic effects of Magnolia officinalis, Verbena officinalis, Momordica charantia, and Daphne genkwa in combination with oxacillin or gentamicin against methicillin-resistant (ATCC43300) and methicillin-susceptible (ATCC25923) S...
April 2017: Experimental Biology and Medicine
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