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Methicillin-resistant Staphylococcus - DOAJ

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Last Updated: 02 May 2022

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Everybody nose: molecular and clinical characteristics of nasal colonization during active methicillin-resistant Staphylococcus aureus bloodstream infection

Abstract Background Healthcare-associated infections are a potentially lethal threat to patients around the world, and Staphylococcus aureus is one of the most common causes of healthcare-associated infections. MRSA growth was evaluated in a single colony culture from the blood and an average of 6 colonies from the nares. MRSA bloodstream infection, 53 were swabbed, and 37 were colonized with MRSA in the anterior nares, with 53 being colonized with MRSA. In 95 percent of the cases, spa types and clonal complexes were also present in the blood. In the nares, 11% of patients had more than a clone of MRSA. Conclusions The molecular epidemiological landscape of colonization in the setting of invasive disease is diverse, and determining the interplay between colonization and invasive disease is critical in combating invasive MRSA disease.

Source link: https://doi.org/10.1186/s12879-022-07371-w


Metal nanoparticles functionalized with nutraceutical Kaempferitrin from edible Crotalaria juncea, exert potent antimicrobial and antibiofilm effects against Methicillin-resistant Staphylococcus aureus

KF@AgNPs and KF@CuNPs' growth on methicillin-resistant Staphylococcus autus has been investigated as part of a discovery of novel mechanisms. Cu on continued treatment with KF@CuNPs in the presence of MRSA was determined by an Alizarin red test, indicating that the CuNPs themselves initiated the antibacterial activity. With Crystal violet assay, fluorescent live dead imaging and SEM results, a 60% decrease in biofilm formation at the Sub-MIC concentrations of KF@AgNPs and KF@CuNPs, the time killing curve showed that both the NPs had similar kill kinetics to reduce the pathogen and imaging. In vivo infection zebrafish model in the treatment group, the colony count decreased by more than 1. 8 fold for KF@AgNPs and more than two fold for KF@CuNPs. When treated with KF@AgNPs and were almost identical to the normal liver, no significant cytological changes were evident, according to Liver morphology results.

Source link: https://doi.org/10.1038/s41598-022-11004-2


Sanchen powder extract combined with vancomycin against methicillin-resistant Staphylococcus aureus

The aim of this research: To investigate the effects of the extract of Sanchen powder mixed with vancomycin on methicillin-resistant Staphylococcus aureus planktonic cells, biofilms, and virulence factors. Methods: The herbs in Sanchen powder were extracted separately with 50% ethanol, according to the following. The presence of hydroxysafflower yellow A and cholic acid in the extract of artificial cattle bezoar and safflower was determined by ultraviolet visible-vis spectrophotometry and high-performance liquid chromatography in the extract of artificial cattle bezoar and safflower by ultraviolet visible-vis spectrophotometry and high-performance liquid chromatography in the extract of artificial cattle bezoar and safflower in the extract of artificial cattle bezo chromato hydroxysafflower yellow A and cholic acid in the color of artificial cattle bezoar and safflower yellow A and chromatic chromatograph and chromatographic chromatography in the colorafflower yellow A and chromatograph and chromatographic chromatic chromatograph and chromatography and chromatography and chromatography, yellow A and chromatography and chromatography and chromatograph and chromatography, colorafflower chromatography and chromatography and chromatography and chromatography and chromatography and chromatography and chromatograph Using a 2,3-bis-tetrazolium5-carboxanilide reduction assay and scanning electron microscopy, we were able to determine the effects of ESCP and vancomycin on MRSA by determining its biofilm viability. The cholic acid content of the artificial C. bovis extract was 7. 34 mg/g, and the C. tinctorius extract's HSYA content was 9. 18 mg/g. Conclusion: This is the first to show that ESCP and vancomycin reduces coagulase and MRSA embedded in mature biofilms and that it is a promising treatment for MRSA infections.

Source link: https://doi.org/10.1016/j.jtcms.2022.03.002


Antimicrobial resistance pattern of methicillin-resistant Staphylococcus aureus isolated from sheep and humans in Veterinary Hospital Maiduguri, Nigeria

Infections caused by antibiotic-resistant S. aureus cause significant health issues in the general population. This research was designed to determine the presence of MRSA in both naturally healthy and sick sheep delivered to the hospital, as well as veterinary staff and students on clinical attachment in the hospital. For the isolation of MRSA, a total of 200 nasal swab samples were collected aseptically from sheep and humans for the isolation of MRSA. MRSA was isolated using the Clinical Laboratory Standard Institute's guideline and confirmed by plating onto Oxacillin Resistance Screening Agar Agar. The MRSA isolates' antimicrobial susceptibility pattern was determined using the disk diffusion method against 12 commonly used antimicrobial agents. S. aureus and MRSA were found to be 51% and 43% in sheep and humans, respectively. MRSA prevalence in male and female sheep was 18% and 8%, respectively, while 9% and 8% were for male and female human samples, respectively. The MRSA isolates from sheep developed 100% resistance to the same drugs used for human MRSA isolates and were equally susceptible to gentamicin, imipenem, LZD, ciprofloxacin, NOR, and ERY. Conclusion: MRSA was found in sheep and humans from the Veterinary Hospital in Maiduguri, according to this report. In addition, the current research did not include MRSA resistance genes such as mecA and spa typing to determine the polymorphism in the X-region using appropriate molecular techniques.

Source link: https://doi.org/10.14202/vetworld.2022.1141-1148


Methicillin-resistant Staphylococcus aureus infections in postpartum period

And if MRSA prevention methods have improved, MRSA infection prevalence in pregnant women and neonates has increased in pregnant women and neonates. Both mothers and infants are impacted by MRSA viruses. After delivery, the aim of this study was to identify the most common risk factors for postpartum MRSA infection and determine the prevalence of antibiotic-resistant Staphylococcus aureus infections. MRSA infection in postpartum, MRSA infection in postpartum,” the following key words were used in a literature review. “MRSA infections in postpartum” were among the risk factors for postpartum MRSA infections. We are looking through 27 papers from the last 20 years that reported rare cases of MRSA infection in postpartum and those that identified the risk factors of this disease after delivery. MRSA infections seem to be more prevalent among pregnant women colonized with MRSA.

Source link: https://doi.org/10.37897/RJID.2021.4.3


Eradication of Biofilm-Mediated Methicillin-Resistant Staphylococcus aureus Infections In Vitro: Bacteriophage-Antibiotic Combination

Both Phage+antibiotic regimens may be more effective on biofilms than either type of agent alone, but it is impossible to determine which PAC regimens will be more efficient. We developed a screen for evaluating PAC combinations against Staphylococcus aureus biofilms using several combinations of phage Sb-1 and clinically relevant antibiotics in order to establish a method for screening PAC combinations against Staphylococcus aureus biofilms. We established the presence of PAC against biofilm versus planktonic bacteria and investigated the emergence of resistance after exposure to PAC. Fewer treatment regimens were more effective against biofilm than planktonic bacteria, as predicted. We also observed less activity against DNS-VISA mutants in experiments with isogenic strain pairs than their respective parents. We found anti-biofilm synergy in the phage+daptomycin regimen with the VISA-DNS strain 8015 and DNS strain 684. Following therapy, we did not find any bacterial resensitization to antibiotics following treatment, but phage permeabilization was avoided after exposure to PAC regimens for all tested strains. Interestingly, phage yields from some biofilm experiments were higher than those from similar planktonic experiments, indicating that Sb-1 can be more easily propagated on biofilm. However, little is known about how phages and their hosts interact in the biofilm environment or how different phage+antibiotic combinations influence biofilms in comparison to planktonic state of bacteria, although scattered reports show that phage+antibiotic synergy occurs more readily under biofilm-like conditions. phage Sb-1 can infect MRSA strains both in biofilm and planktonic states, as well as suggested PAC regimens that might be investigated as adjuncts to antibiotics, according to our findings.

Source link: https://doi.org/10.1128/spectrum.00411-22


Role of Extracellular DNA in Dalbavancin Activity against Methicillin-Resistant Staphylococcus aureus (MRSA) Biofilms in Patients with Skin and Soft Tissue Infections

ABSTRACT Methicillin-resistant Staphylococcus aureus has been the leading cause of skin and soft tissue infections. The aim of the investigation was to determine the effectiveness of various antibiotics on biofilm-producing MRSA isolated from SSTI-infected patients. Patients with SSTI were found with a total of 32 MRSA strains. Planktonic and biofilm growth was determined by the MIC and minimal biofilm eradication concentration. 87. 5% were good biofilm developers, while only 12. 5% were poor biofilm developers. In all tested strains, the MBEC90 values for dalbavancin were significantly lower than those of linezolid and vancomycin. We also discovered that extracellular DNA plays a role in the initial microbial attachment and biofilm formation. The number of eDNA differed among MRSA strains, but it was significantly higher in those isolates with high dalbavancin and vancomycin tolerance, according to MRSA strains. Of note, the relative abundance of eDNA in MRSA biofilms exposed to MBEC90 dalbavancin was higher in MRSA biofilms treated with morphine and films exposed to sub-MIC90. Overall, dalbavancin was the most effective antibiotic against MRSA biofilms in human serum concentrations. IMPORTANCE Staphylococcus aureus is the most common cause of skin and soft tissue infections around the world. Due to a higher antibiotic sensitivity, biofilm production by S. aurus is the most common risk factor in SSTIs. Our analysis revealed that the biofilm-forming capacity varied among MRSA strains, although good biofilm producers were considerably more prolific than weak biofilm producer strains.

Source link: https://doi.org/10.1128/spectrum.00351-22


Rapid Identification of Methicillin-Resistant Staphylococcus aureus Using MALDI-TOF MS and Machine Learning from over 20,000 Clinical Isolates

The area under the classification model's receiver operating curve was 0. 78 to 0. 88 for the data set, which included 20,359 clinical isolates. Compared to UPF0379 protein SACOL1680, which is mainly present in methicillin-susceptible S. aurus, this important MRSA property, m/z 6,590 to 6,599, was identified as a UPF0337 protein SACOL1680 with a lower binding affinity or no docking results. Our MALDI–TOF MS-based machine learning system for rapid MRSA detection can be easily integrated into current clinical workflows and can further assist physicians in prescribing effective antibiotic therapy. IMPORTANCE Over 20,000 clinical MSSA and MRSA isolates were obtained to develop a machine learning system to recognize MSSA/MRSA and their markers, as well as MRSA/MRSA isolates. MRSA markers were first found and validated on the first scale of clinical MSSA and MRSA isolates collected to date, in five separate clinical centers.

Source link: https://doi.org/10.1128/spectrum.00483-22


The Host CYP1A1-Microbiota Metabolic Axis Promotes Gut Barrier Disruption in Methicillin-Resistant Staphylococcus aureus-Induced Abdominal Sepsis

BACKGROUNDINGCHACHASTE: BackgroundHistoryToday is a chronic disease-controller of intestinal barrier function. MRSA-infected patients with sepsis and persistent MRSA infection. The resultsMice lacking CYP1A1 decreased gut microbiome, a decreased metabolic shift from lysine to cadaverine in the caecal contents and antimicrobial molecule manufacturing were confirmed, and they were shielded against gut barrier disruption when exposed to MRSA challenge. After MRSA infection, antibiotic-driven gut dysbacteriosis harmed the survival ability and disrupted intestinal barrier integrity in CYP1A1 KO mice. In addition, elevated cadaverine levels in feces and serum were found in critically ill patients with gastrointestinal disease as a result of persistent MRSA infection, despite normal controls, although cadaverine was not detected in healthy controls.

Source link: https://doi.org/10.3389/fmicb.2022.802409


In vitro Antimicrobial Activity and the Mechanism of Berberine Against Methicillin-Resistant Staphylococcus aureus Isolated from Bloodstream Infection Patients

Methods: Fourteen clinical MRSA isolates were collected and analyzed, with the aim of combating methicillin-resistant Staphylococcus aureus strains isolated from bloodstream infections. Cell wall alterations and cell membrane integrity were determined by confocal laser scanning microscopy and electron microscopy to determine the effect on cell morphology, according to our results. Cell wall alterations and cell membrane integrity were determined by cellular wall microscopy and electron microscopy to determine the effect on cell morphology.

Source link: https://doaj.org/article/121528697ff24217983861bc3d86f5eb

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions