Detecting methicillin resistance in Staphylococcus aureus: comparison of different phenotypic methods and the polymerase chain reaction.

Detecting methicillin resistance in Staphylococcus aureus: comparison of different phenotypic methods and the polymerase chain reaction. Br J Biomed Sci. 2013;70(3):93-6 Authors: Ahmad S Abstract Cefoxitin is a more potent inducer of the mecA regulatory system compared to oxacillin in Staphylococcus aureus. It has been recommended for the detection of methicillin-resistant Staphylococcus aureus (MRSA) when using disk-diffusion testing. The aim of this study is to compare the results of cefoxitin and oxacillin disk-diffusion methods against the polymerase chain reaction (PCR) for the detection of MRSA. A total of 75 strains of S. aureus isolated from different clinical specimens (e.g., pus, blood, wound swabs, tracheal aspirates, eye swabs and cerebrospinal fluid [CSF]) were screened for methicillin resistance by PCR and cefoxitin and oxacillin disk-diffusion tests. The antibiotic susceptibility testing was performed by the Baur disk-diffusion method using oxacillin (1 microg) and cefoxitin (30 microg) disks on Mueller Hinton agar (MHA), and zone diameters as recommended by CLSIs were read at 18 h and 24 h. All MRSA isolates detected phenotypically were confirmed by PCR for the amplification of mecA and nucA genes. Of the 75 isolates screened, 27 were resistant to oxacillin, 30 were resistant to cefoxitin using the disk-diffusion method, while 30 isolates were confirmed as MRSA by PCR. Performing the cefoxitin disk-diffusion method using a 30 microg disk c...
Source: British Journal of Biomedical Science - Category: Laboratory Medicine Tags: Br J Biomed Sci Source Type: research

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Publication date: November 2019Source: Saudi Journal of Biological Sciences, Volume 26, Issue 7Author(s): Asmaa FadenAbstractWe assessed the prevalence of methicillin-resistant Staphylococcus aureus (MRSA) strains on surfaces of hospital dental clinics. Specimens were obtained from 5 clinically symptoms-free patients of five different specialties clinics (Implantology, Pediatric Dentistry, Prosthetics, Restorative Dentistry, and Oral Medicine) of the Dental Clinic Hospital of King Saud University before and after each patient. A Q-tip swabs were used from 10 surfaces in each clinic (Arm rest of dental chair, floor beneath ...
Source: Saudi Journal of Biological Sciences - Category: Biology Source Type: research
Publication date: Available online 5 November 2019Source: Inorganica Chimica ActaAuthor(s): Mousumi Nayak, Ashish Kumar Singh, Pradyot Prakash, Rajni Kant, Subrato BhattacharyaAbstractThiosalicylato complexes of Zn(II) and Hg(II), [Zn(SC6H4CO2)(TMEDA)]2 (1) and [TMEDA-H2][Hg(SC6H4CO2)2] (2) where (TMEDA = N,N,N',N'-tetramethylethylenediamine) have been synthesized and characterized by spectral and single crystal X-ray analyses. Thiosalicylate opted different binding modes; in 1 all three binding sites are used whereas in 2 bonding of the ligands are mainly through S atoms, however, Hg-O distances indicate the existence...
Source: Inorganica Chimica Acta - Category: Chemistry Source Type: research
ConclusionsAn antibiotic allergy label was associated with significantly higher rates of MRSA colonization but no statistical difference with VRE colonization.
Source: American Journal of Infection Control - Category: Infectious Diseases Source Type: research
AbstractHistorically, vancomycin has been considered a primary therapeutic option for treating infections withStaphylococcus aureus, but isolates with reduced vancomycin susceptibility (SA-RVS) (MIC  ≥ 4 μg/mL) have emerged. Telavancin, a semisynthetic lipoglycopeptide, is an alternative treatment option forS. aureus, but data examining telavancin activity against SA-RVS are limited. In the present study, we characterize 300 isolates ofS. aureus isolates (50 vancomycin-susceptible (VSSA) isolates and 250 SA-RVS isolates) from a large tertiary care, academic medical center, 51.8% of which were methi...
Source: European Journal of Clinical Microbiology and Infectious Diseases - Category: Microbiology Source Type: research
AbstractMethicillin-resistantStaphylococcus aureus (MRSA) is an important cause of infections in humans. Photodynamic therapy using blue light (450  nm) could possibly be used to reduce MRSA on different human tissue surfaces without killing the human cells. It could be less harmful than 300–400 nm light or common disinfectants. We applied blue light ± riboflavin (RF) to MRSA and keratinocytes, in an in vitro liquid layer model, and compar ed the effect to elimination using common disinfection fluids. MRSA dilutions (8 × 105/mL) in wells were exposed to blue light (450  nm) &...
Source: Lasers in Medical Science - Category: Laser Surgery Source Type: research
Methicillin-resistant Staphylococcus aureus (MRSA) is a common pathogenic bacterium that causes nosocomial and community-acquired infections. Annual report of nationwide survey in Japan revealed MRSA was detected at 100% of the hospitals in 2017 (Japan Nosocomial Infections Surveillance (JANIS), 2019). Moreover, MRSA infection can cause severe illness not only in immunocompromised patients but also in healthy people. Although anti-MRSA therapeutic agents are clinically available, MRSA infection can be life threatening.
Source: International Journal of Infectious Diseases - Category: Infectious Diseases Authors: Source Type: research
Publication date: Available online 12 November 2019Source: Journal of Photochemistry and Photobiology B: BiologyAuthor(s): Violet Vakunseh Bumah, Daniela Santos Masson-Meyers, Chukuka Samuel EnwemekaAbstractIn our recent study, we showed that pulsed blue light (PBL) suppresses the growth of Propionibacterium acnes more than continuous wave (CW) blue light in vitro, but it is not known that other bacteria, such as methicillin-resistant Staphylococcus aureus (MRSA), respond similarly to PBL. The high potency of PBL relative to CW blue light makes it a suitable antimicrobial for suppressing bacterial growth in biofilms as wel...
Source: Journal of Photochemistry and Photobiology B: Biology - Category: Speech-Language Pathology Source Type: research
Publication date: Available online 11 November 2019Source: The Lancet Respiratory MedicineAuthor(s): Daniel J Wolter, Frankline M Onchiri, Julia Emerson, Mimi R Precit, Michael Lee, Sharon McNamara, Laura Nay, Marcella Blackledge, Ahmet Uluer, David M Orenstein, Michelle Mann, Wynton Hoover, Ronald L Gibson, Jane L Burns, Lucas R Hoffman, Daniel J Wolter, Frankline M Onchiri, Julia Emerson, Mimi R Precit, Michael LeeSummaryBackgroundStaphylococcus aureus is the bacterium cultured most often from respiratory secretions of people with cystic fibrosis. Both meticillin-susceptible S aureus and meticillin-resistant S aureus (MR...
Source: The Lancet Respiratory Medicine - Category: Respiratory Medicine Source Type: research
This study surveys the clinical relevance of the nasalStaphylococcus aureus colonization status on intensive care unit (ICU) –acquiredS.aureus infections and compares molecular characteristics of isolates from the nose and infectious sites. The 390 patients included comprised 278 non-carriers and 112 carriers. Among the carriers, 56 were decolonized with mupirocin. Decolonization was verified through a second (negative) culture. Spa typing and virulence gene profiling were performed for all isolates. Twenty sixS.aureus infections were detected in the carriage group and 20 in the non-carriage group. Eighteen of these ...
Source: European Journal of Clinical Microbiology and Infectious Diseases - Category: Microbiology Source Type: research
Abstract Omadacycline is an effective therapy for community-acquired bacterial pneumonia (CABP). Given its potent activity against methicillin-susceptible S. aureus (MSSA) and methicillin-resistant S. aureus (MRSA), we sought to determine the pharmacodynamic activity and target PK/PD exposures associated with therapeutic effect in the neutropenic mouse pneumonia model against 10 MSSA/MRSA strains. The area under the concentration-time curve (AUC)/MIC associated with 1-log kill was noted at 24h ELF and plasma AUC/MIC exposures of ∼2 (ELF range
Source: Antimicrobial Agents and Chemotherapy - Category: Microbiology Authors: Tags: Antimicrob Agents Chemother Source Type: research
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