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Methicillin-Resistant Staphylococcus Aureus - Astrophysics Data System

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Last Updated: 02 May 2022

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Antibody-mediated enhancement of community-acquired methicillin-resistant Staphylococcus aureus infection

Streptobact absces models with a foreign body at the outbreak site resulted in more effective reproduction of absces strains than isogenic PVL+ strains. Mice were treated with antibodies to PVL and then infected with seven distinct PVL + strains had noticeably higher bacterial counts in absces infections than mice treated with nonimmune serum. Antibody to PVL had no effect on MRSA strains that did not produce PVL, according to MRSA strains that did not produce PVL. The interference of PVL-triggered intrinsic immune responses by In vitro, an antibody to PVL, incapacitated PVL-mediated activation of PMNs, indicates that PVL-mediated primark activation of PMNs is enhanced by this interaction. Given the high incidence of primary and recurring MRSA infections in humans, it appears that antibodies to PVL may have contributed to host susceptibility to infection.

Source link: https://ui.adsabs.harvard.edu/abs/2010PNAS..107.2241Y/abstract


Transmission of Methicillin-Resistant Staphylococcus aureus to Human Volunteers Visiting a Swine Farm

In four trials, an experimental research included 34 human volunteers who spent 1 h in a MRSA-positive swine farm. MRSA concentrations in nasal swabs, throat swabs, and air samples were determined at various time points and analyzed in relation to relevant covariates. During the farm visit, 94% of the volunteers received MRSA, according to this report. The nasal MRSA count had dropped to unquantifiable levels in 95 percent of the samples, just two hours after the volunteers left the stable. The Nasal MRSA carriage was positively correlated to personal exposure to airborne MRSA and farm work involving pig contact and was negatively linked to smoking. The rise in human MRSA carriage among the volunteers with pig contact seems to be largely dependent on the increased prevalence of airborne MRSA of the surrounding air, not specifically pig physical contact. ImportANCE IN A swine farm The experimental approach made it possible to clarify the contributions of airborne MRSA levels and farm labor to nasal MRSA carriage in a swine farm. MRSA infections in the nasal samples were most likely negligible due to the observed decrease to unquantifiable levels in 95% of the nasal samples after only 2 h. And measures to minimize the amount of MRSA in the air or the use of face masks could ultimately reduce nasal contamination.

Source link: https://ui.adsabs.harvard.edu/abs/2017ApEnM..83E1489A/abstract


From the Cover: Patient sharing and population genetic structure of methicillin-resistant Staphylococcus aureus

We investigated whether the percentage of shared patients between hospitals was correlated to the genetic similarity of MRSA strains from those hospitals. Multivariate linear regression analysis of data obtained from 30 of 32 hospitals in Orange County, California, showed that for each twofold increase in the proportion of patients shared between 2 hospitals, there was a 7. 7% decrease in genetic heterogeneity between the hospitals' MRSA populations. These results show that coordinated efforts among hospitals that share large numbers of patients can be synergistic to prevent MRSA outbreaks.

Source link: https://ui.adsabs.harvard.edu/abs/2012PNAS..109.6763K/abstract


From the Cover: Methicillin resistance in Staphylococcus aureus requires glycosylated wall teichoic acids

S. aurus WTAs are characterized by the discovery and biochemical characterization of TarS, a unique glycosyltransferase that bonds -O-GlcNAc residues. Following tarS deletion, methicillin-resistant S. aureus has been alerted to lactams. Unlike strains who are entirely lacking WTAs, which are also vulnerable to lactams, tarS strains have no growth or cell division defects.

Source link: https://ui.adsabs.harvard.edu/abs/2012PNAS..10918909B/abstract


The prevalence of virulence determinants in methicillin-resistant Staphylococcus aureus isolated from different infections in hospitalized patients in Poland

The presence of 19 virulence genes in 120 MRSA isolates obtained from hospitalized patients and familial relationships of these isolates was investigated. In 75% isolates, the tst gene, which codes for toxic shock syndrome toxin-1, was present. The cna, map/eap, and tst genes were the most common in wound isolates and less common in blood isolates, and they were less prevalent in blood isolates. The t003 was the most common isolate from the respiratory tract, while the t008 was the most common among isolates from the respiratory tract, while the t008 was the most common, while the t008 was the most isolated of blood isolates. MRSA virulence factors are also crucial for determining pathogen transmission rate and disease formation.

Source link: https://ui.adsabs.harvard.edu/abs/2022NatSR..12.5477K/abstract


Human Urine Alters Methicillin-Resistant Staphylococcus aureus Virulence and Transcriptome

However, it is also vital to know MRSA pathophysiology in the urinary tract because MRSA is often isolated in urine samples, often leading to potentially life-threatening MRSA infection. We exposed three S. aureus clinical isolates, two MRSA strains, to human urine for 2 h, determining virulence characteristics and gene expression in order to determine the molecular mechanisms governing MRSA urinary pathogenesis. Our findings, in summary, reveal key insights into how human urine specifically and rapidly changes MRSA physiology, supporting MRSA survival in the nutrient-limiting and hostile urinary microenvironment. However, it is vital to know MRSA pathophysiology in the urinary tract because MRSA isolation in urine samples often precedes potentially lethal MRSA bacteremia. We explore how exposure to human urine alters MRSA global gene expression and virulence in this paper.

Source link: https://ui.adsabs.harvard.edu/abs/2021ApEnM..87E.744P/abstract


A Factor H-Fc fusion protein increases complement-mediated opsonophagocytosis and killing of community associated methicillin-resistant Staphylococcus aureus

We have previously reported that S. aureus binds the complement regulator factor H via surface protein SdrE in order to prevent complementation. We investigated the effects of a fusion protein from FH's SdrE-interacting domain of FH and IgG Fc on complement-mediated opsonophagocytosis and bacterial death of community-associated methicillin-resistant S. aureus species. Compared to Fc-control proteins and FH-Fc, S. aureus binding was much higher in FH-Fc, while FH-Fc competed with serum FH for S. aureus binding. Increased C3-fragment opsonization of S. austria for both C3b and iC3b, as well as the increased production of the anaphylatoxin C5a. Polymorphonuclear cells in 5 and 10% serum also raised S. aureus killing by polymorphonuclear cells, which was characteristically raised during FH-Fc therapy. This research shows that FH-Fc fusion proteins have the ability to reduce the protective effects of bound serum FH rendering S. aureus, which are more vulnerable to the host immune system.

Source link: https://ui.adsabs.harvard.edu/abs/2022PLoSO..1765774S/abstract


Methicillin-Resistant Staphylococcus aureus Strains in Swiss Pigs and Their Relation to Isolates from Farmers and Veterinarians

MRSA prevalence in Swiss pigs has increased from 2% in 2009 to 44% in 2017, according to our study, which shows a dramatic rise in MRSA prevalence in Swiss pigs has gone from 2% in 2009 to 44 percent in 2017. In addition, we could find that pig spa t011 strains cluster separately and are possibly less likely to colonize humans than are pig spa t034 strains. ABSTRACT Methicillin-resistant Staphylococcus aureus has emerged over the past few decades as a One Health disease with an increasing prevalence in various animal species. The current report looked at the course of MRSA epidemics in Swiss livestock since 2009, with a particular focus on pigs and screening of veterinarians and farmers. MRSA infections in Swiss pigs increased from 2% in 2009 to 44% in 2017, according to porcine t034 strains. A large number of additional resistance genes were present in spa t034 strains, and two strains had the immune evasion cluster, and two strains had inherited the immune evasion cluster. However, all but one of the pig spa t011 strains gathered in a group. So, the rise in pig spat011 strains does not necessarily refer to humans. MRSA prevalence in Swiss pigs has risen from 2% in 2009 to 44% in 2017, according to our study. In addition, we could show that pig spat011 strains cluster separately and are less likely to colonize humans than are pig spa t034 strains.

Source link: https://ui.adsabs.harvard.edu/abs/2020ApEnM..86E1865K/abstract


Antimicrobial peptide GL13K immobilized onto SLA-treated titanium by silanization: antibacterial effect against methicillin-resistant Staphylococcus aureus (MRSA)

Infection is the primary reason for implant failure, and the incidence of drug-resistant bacterial infections has risen in recent years. Antimicrobial peptides have demonstrated superiority over conventional antibiotics in inhibiting drug-resistant bacteria in inhibiting drug-resistant bacteria. The coating's morphology was shown by images from field emission scanning electron microscopy films. By water contact angle analysis, Attenuated total reflectance Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy data confirmed loading of GL13K, and the hydrophilicity of the SLA-GL13K coating was determined by water contact angle analysis. Samples from the university revealed that the coating has a long-release history. MRSA, E. coli, and S. aureus killed by contact- and release-killing capabilities against SLA-GL13K coating, which demonstrated good contact- and release-killing capabilities against MRSA, E. coli, and S. aureus. Meanwhile, Cell Counting Kit 8 analysis and analysis of cell morphology showed that the SLA-GL13K coating had good cytocompatibility at antibacterial concentrations. Overall, all these results show that SLA-GL13K coating can be successfully manufactured using silanization, and it is a promising candidate for combating MRSA-related implant-related infections.

Source link: https://ui.adsabs.harvard.edu/abs/2022RSCAd..12.6918L/abstract


Zinc Resistance within Swine-Associated Methicillin-Resistant Staphylococcus aureus Isolates in the United States Is Associated with Multilocus Sequence Type Lineage

In this research, we report the prevalence of the czrC gene and phenotypic zinc resistance in swine-associated LA-MRSA ST5 isolates, MRSA ST5 isolates from humans with no swine contact, and U. S. swine-associated LA-MRSA ST398 isolates in U. S. swine isolates, MRSA ST5 isolates, MRSA ST5 isolates from humans with no s zinc resistance in MRSA ST5 isolates from humans with no swine contact or swine-associated LA-MRSA ST398 isolates was significantly lower than that in other LA-MRSA ST398 isolates, as well as prevalences from previous studies describing zinc resistance in other LA-MRSA ST398 isolates. Our findings show that selection pressures associated with zinc supplementation in feed is unlikely to have played a significant role in the success of LA-MRSA ST5 in the United States swine population.

Source link: https://ui.adsabs.harvard.edu/abs/2017ApEnM..83E.756H/abstract

* 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