Advanced searches left 3/3

Methicillin-Resistant Staphylococcus Aureus - Europe PMC

Summarized by Plex Scholar
Last Updated: 02 May 2022

* If you want to update the article please login/register

The novel fosfomycin resistance gene fosY is present on a genomic island in CC1 methicillin-resistant Staphylococcus aureus .

Fosfomycin, a methicillin-resistant Staphylococcus aureus infections, has gaining attention as a combination therapy for methicillin-resistant Staphylococcus aureus infections. Hence, the finding of novel fosfomycin-resistance mechanisms in S. austria is also vital. Here are the minimum inhibitory concentrations of fosfomycin in a CC1 methicillin-resistant S. aurus. S. aurus' CC1 strains were found to establish clustering of the CC1 strains. In S. austria, we identified a novel gene, named fosy, that gives fosfomycin resistance. FosY is found on a new genomic island that was previously unknown fosy that arose from other species, according to the bioinformatic study. This fosY-positive ST1 clone appeared in the same clade as the global phylogenetic tree of ST1 MRSA, originating from various regions in the same clade. The failure of clinical therapy can be due to the discovery of CC1 MRSA in the fosy family, fosY, and a genetic island, RI fosY.

Source link: https://europepmc.org/article/MED/35332834


Methicillin-resistant Staphylococcus aureus in China: a multicentre longitudinal study and whole-genome sequencing.

The aim of this research was to investigate the genomic epidemiology of MRSA in China in order to determine prevalent lineages and their associated genetic and phenotypic features. We carried out whole-genome sequencing of 565 MRSA isolates from 7 provinces and municipalities of China between 2014 and 2020 in this report. Among 565 MRSA isolates tested, clonal complex 59, CC5, and CC8 were the key lineages, with ST59-t437-IV, ST239-t030-III, and ST5-II being the most prevalent, respectively, with the clonal structure dominating the clonal structure. MRSA was less susceptible to most tested antimicrobials and had fewer resistance determinants, according to the CC59 MRSA. But CC8 and CC5, respectively, were closely linked to rifampicin resistance and mupirocin resistance, respectively. In ST338, CC398, ST8, and CC22, encoding genes were more prevalent, than in CC30, CC398, ST8, and CC22, respectively, with tsst -1 being associated with ST5. Our report shows that MRSA surveillance in China is ineffective in monitoring MRSA epidemiology shifts in China.

Source link: https://europepmc.org/article/MED/35060838


Identification of methicillin-resistant Staphylococcus aureus ST8 isolates in China with potential high virulence.

Staphylococcus aureus ST8 strains that have been methicillin-resistant have contaminated outbreaks in many countries, spreading internationally. Consequently, detailed information on the phylogeny and potential virulence of S. aureus ST8 strains in China remains unknown. Among them, MR50 and MR526 harboured spa t008, SCC mec IVa, an arginine catabolic mobile component, and were phylogenetically close to the outbreak USA300 strains, while the other four strains were related to spa t9101 and formed a special branch. Excepting MR254, the China S. aurus ST8 strain LAC produced weak biofilms except MR254. MR254 had significantly higher haemolysis ability and elevated -toxin levels among them, among others, while MR526 had similar haemolysis and oxin production rates as USA300-LAC. These findings indicated that the China MRSA ST8 isolates were highly infectious, with higher or similar virulence characteristics as the epidemic USA300 strain.

Source link: https://europepmc.org/article/MED/35044290


A temperate Siphoviridae bacteriophage isolate from Siberian tiger enhances the virulence of methicillin-resistant Staphylococcus aureus through distinct mechanisms.

Although bacteriophages are used as an effective antibiotic to treat infections caused by drug-resistant pathogens, some bacteria, particularly the temperate bacteriophage, may also influence the host bacteria's virulence in specific ways. Using an MRSA strain SA14 as the indicator, we isolated a bacteriophage vB_Saus_PHB21 from an epidermal sample of Siberian tiger vs. However, the introduction of PHB21 genome into the host MRSA of cell adhesion, anti-phagocytosis, and biofilm formation were all beneficial to cell adhesion, anti-phagocytosis, and biofilm formation. Mice challenged with SA14+ demonstrated more severe organ lesions and elevated inflammatory cytokines than those challenged with SA14.

Source link: https://europepmc.org/article/MED/34986751


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

For the first time, C. juncea extract and kaempferitrin were used to achieve optimum for the synthesis of silver and copper nanoparticles by using C. juncea extract and kaempferitrin. The effectiveness of KF@AgNPs and KF@CuNPs against biofilm production and planktonic growth on methicillin-resistant Staphylococcus autus has been investigated, as well as potential mechanisms. Cucucuritis after prolonged therapy with KF@CuNPs in the presence of MRSA was determined by an Alizarin red test, indicating that the CuNPs' antibacterial action is initiated by the CuNPs themselves. In vivo infection zebrafish model in the treatment group, there was a decrease of > 1. 8 fold for KF@AgNPs and > two fold for KF@CuNPs. When treated with KF@AgNPs, the normal liver showed no significant cytological changes, and they were almost identical to the normal liver.

Source link: https://europepmc.org/article/MED/35487931


Bacterial toxin-triggered release of antibiotics from capsosomes protects a fly model from lethal methicillin-resistant Staphylococcus aureus (MRSA) infection.

In the presence of MRSA toxins regulated by the Agr quorum sensing device, the capsosomes are engineered and shown to release their drug payloads. MRSA-activated single drug delivery of vancomycin and synergistic dual delivery of vancomycin, as well as an antibacterial peptide successfully killed MRSA in vitro. Capacity of capsosomes to selectively deliver their cargo in the absence of bacteria, resulting in a bactericidal effect on the host organism, is demonstrated in vivo by a Drosophila melanogaster MRSA infection model.

Source link: https://europepmc.org/article/MED/35481905


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

To investigate the diversity within hosts and detail the clinical characteristics associated with concomitant nasal colonization, here we provide information on a new collection of colonizing isolates from methicillin-resistant S. aureus bloodstream infections. For MRSA expansion, a single colony culture from the blood and an average of six colonies from the nares were evaluated. MRSA bloodstream infection, 53 were swabbed, 53 were arrested, and 37 were colonized with MRSA in the anterior nares, over an 11-month period. In 95% of cases, spa types and clonal complexes were also present in the blood. In the nares, 11% of patients had more than one clone of MRSA. Conclusions The molecular epidemiological landscape of colonization in the area of invasive disease is varied, and determining the relationship between colonization and invasive disease is crucial in combating invasive MRSA disease is crucial.

Source link: https://europepmc.org/article/MED/35462538


Clearance of mixed biofilms of Streptococcus pneumoniae and methicillin-susceptible/resistant Staphylococcus aureus by antioxidants N-acetyl-L-cysteine and cysteamine.

We investigated the relationship between S. aureus and S. pneumoniae in mixed biofilms and the development of new antibiofilm therapies with antioxidants N-acetyl-L-cysteine and cysteamine. To achieve a similar population rate in the mixed biofilm, S. pneumoniae required a higher percentage of cells in the inoculum and planktonic culture. We investigated the role of Cys in preventing S. aureus biofilms and S. aurus mixed biofilms from being made. In addition, NAC treatment of 5 mg/ml almost eradicated the S. pneumoniae disease epidemic and killed nearly 94% of MRSA cells and 99% of MRSA cells in the mixed biofilms.

Source link: https://europepmc.org/article/MED/35461321


Novel antimicrobial peptides with bactericidal effect against Methicillin-resistant Staphylococcus aureus & biofilm forming Methicillin-resistant Staphylococcus aureus

MRSA is difficult to handle when there are no options for therapy such as vancomycin, linezolid, or clindamycin. MRSA and biofilm forming MRSA were tested by this peptide against MRSA and biofilm forming MRSA. Both MRSA and biofilm forming MRSA were killed by the peptide, which had low toxicity to human red blood cells, according to Promising's report. In addition, our novel peptide and vancomycin against MRSA exhibits a potent synergistic effect when mixed with vancomycin against MRSA. In addition, a combination of our peptide, levofloxacin, and clarithromycin resulted in synergistic activity with biofilm forming MRSA.

Source link: https://europepmc.org/article/PPR/PPR485256


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

Purpose: Objectives: To look at the antimicrobial properties of berberine and the way it fights methicillin-resistant Staphylococcus aureus strains isolated from patients with bloodstream infections, the drug is investigated. Cell wall alterations and cell membrane integrity were determined by cell wall microscopy and electron microscopy to determine the effect on cell morphology. MRSA was effective against MRSA at MIC values ranging from 256 to 64 mg/L-1 for various MLST types, according to our results. In addition, bacterial cytological profiling shows that berberine destroyed the cell walls, membrane integrity, and overall changed cell morphology with concentration increased. When combined with clindamycin and rifamycin separately, berberine has excellent anti-MRSA activity and synergistic antibacterial property, and can be used in a variety of research, but the actual procedure requires cell wall and membrane destruction.

Source link: https://europepmc.org/article/MED/35469308

* 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