En esta investigación fueron evaluados 286 pacientes que presentaron conjuntivitis bacteriana como impresión diagnóstica más frecuente. En 286 cultivos microbiológicos realizados se obtuvieron 177 ...aislamientos bacterianos, encontrándose un 73.45% de flora Gram positiva siendo las especies más frecuentes S. epidermidis (48.46%), S. aureus (35.38%),S. pneumoniae (4.61%) y Corynebacterium sp. (2.31%). El 26.55% correspondió a bacilos Gram negativos de los cuales el 74.47% son enterobacterias y el 25.53% microorganismos no fermentadores. En este estudio no se encontró diferencia significativa entre la convivencia o no con animales y tipo de microorganismo aislado asociado a zoonosis.
En la literatura existen pocos estudios acerca de la distribución de Staphylococcus spp en boca y los que hay sobre estos microorganismos como residentes de la cavidad oral son controversiales.
El ...género Staphylococcus spp conforma un importante grupo de patógenos en el ser humano y origina distintas enfermedades, entre ellas, la Endocarditis Infecciosa; de igual forma, la literatura reporta tasas de resistencia a amoxicilina y clindamicina antibióticos usados comúnmente para la profilaxis en odontología. Objetivo: Conocer la sensibilidad de Staphylococcus spp a amoxicilina y la clindamicina aislados de cavidad oral de pacientes con alto riesgo de Endocarditis Infecciosa.
Although evidence supports that the acne microbiome harbors a diverse range of microbes that play a vital role in the progression of acne vulgaris, the culturable microbes in the acne microbiome have ...not yet been largely identified. Here, we grew microbe colonies from entire acne lesions on agar plates and identified abundant Staphylococcus, Acinetobacter, and Pseudomonas species from forty selected single colonies. Staphylococcus species, including Staphylococcus epidermidis (S. epidermidis), Staphylococcus hominis (S. hominis), and Staphylococcus aureus (S. aureus), were isolated from tryptic soy broth (TSB) agar plates. However, Cutibacterium acnes (C. acnes) was predominately isolated from furazolidone-supplemented TSB agar plates. Results from gas chromatography-mass spectrometry (GC-MS) analysis revealed that, besides acetate, propionate and butyrate were the main short-chain fatty acids (SCFAs) in fermentation metabolites of C. acnes and S. epidermidis isolates, respectively. The culturable bacteria and SCFA profiles presented in this study provide a reservoir for selecting acne probiotics and developing SCFA-associated therapies against acne vulgaris.
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•Culturable microbes including S. epidermidis were gained from entire acne lesions.•C. acnes was predominately isolated from furazolidone-supplemented agar plates.•Acetates and butyrate are main SCFAs in fermentation metabolites of S. epidermidis.•Propionate was abundantly produced by C. acnes isolates.•Our results provide a reservoir for selecting probiotics against acne vulgaris.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
Introduction This study aims to delineate the etiology and prevalence of isolated pathogens, along with the clinical characteristics of endophthalmitis patients over a 9-year period at hospital in ...Southwest of China. Additionally, we investigating the metabolic and cellular processes related to environmental factors may offer novel insights into endophthalmitis. Methods We analyzed data pertaining to endophthalmitis patients treated at the Affiliated Hospital of Yunnan University from 2015 to 2023. According to our clinical data, we conducted an experiment based on transcriptomics and metabolomics analysis to verify whether environmental factors affect behavior of S. epidermidis by culturating S. epidermidis under oxic and microoxic condition. Results In this study, 2,712 fungi or bacteria strains have been analyzed, gram-positive bacteria constituted 65.08%, with S. epidermidis being the most predominant species (25.55%). Ophthalmic trauma was the primary pathogenic factor for S. epidermidis ocular infections. Regarding fluoroquinolones, S. epidermidis exhibited the higher resistance rate to levofloxacin than moxifloxacin. Moreover, our investigation revealed that S. epidermidis in microoxic environment increase in energy metabolism, amino acid metabolism, and membrane transport. Conclusion Our findings underscore the significance of S. epidermidis as a crucial pathogen responsible for infectious endophthalmitis. It is crucial to exercise vigilance when considering Levofloxacin as the first-line drug for empiric endophthalmitis treatment. The metabolites alteration observed during the commensal-to-pathogen conversion under microoxic condition serve as a pivotal environmental signal contributing to S. epidermidis metabolism remodeling, toward more pathogenic state.
Many species of bacteria interact on the human skin to form a certain microbiome. Delftia acidovorans, a bacterium detected from human skin, inhibits the growth of S. epidermidis, a dominant ...bacterium of the human skin microbiota. Here, we show that ammonia secreted by D. acidovorans inhibits the growth of S. epidermidis by increasing the pH value of the medium. The pH value of D. acidovorans culture supernatant (CS) was higher than that of the medium without culture. The inhibitory activity of the D. acidovorans CS against the growth of S. epidermidis was decreased by neutralization with hydrochloric acid. Genes encoding enzymes related to ammonia production were found in the D. acidovorans genome. Moreover, the D. acidovorans CS contained a high concentration of ammonia. The addition of ammonia to S. epidermidis culture led to an increase in the reactive oxygen species (ROS) production and inhibited S. epidermidis growth. The addition of sodium hydroxide also led to an increase in the ROS production and inhibited S. epidermidis growth. The inhibitory activity of ammonia and sodium hydroxide against S. epidermidis growth was suppressed by malonic acid, an inhibitor of succinate dehydrogenase in the tricarboxylic acid (TCA) cycle, and N-acetyl-l-cysteine, a free radical scavenger. These findings suggest that D. acidovorans secretes ammonia and alkaline stress inhibits the growth of S. epidermidis by inducing TCA cycle-triggered ROS production.
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•Delftia acidovorans inhibits the growth of S. epidermidis and secretes ammonia.•Ammonia and sodium hydroxide induce ROS production in S. epidermidis.•ROS production occurs via the TCA cycle and inhibits growth in S. epidermidis.•Alkaline stress inhibits S. epidermidis growth by TCA cycle-triggered ROS production.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
Background: Staphylococcus epidermidis (S. epidermidis) has emerged as a major etiological factor in implant-related infections, primarily due to its biofilm forming ability. These biofilms enhances ...bacterial resistance to antimicrobial agents. Aim: This study aimed to detect and characterize drug-resistant S. epidermidis strains in clinical samples obtained from Menoufia University Hospitals, with evaluating their biofilm-forming ability and assessing the antimicrobial activity of chlorhexidine and povidone iodine. Methodology: Drug-resistant S. epidermidis strains were identified using the Vitek2 system and their biofilm producing ability was determined. The presence of biofilm-related genes (icaA and icaD) was confirmed through polymerase chain reaction (PCR). Multi-drug resistant S. epidermidis isolates capable of biofilm formation were exposed to varying concentrations of chlorhexidine (0.025%, 0.035%, 0.05%, 0.12%) and povidone iodine (1.5%, 3.5%, 7.5%, 10%) for different exposure times. Results: Of 354 clinical isolates, 75 (21.2%) were identified as drug-resistant S. epidermidis using Vitek2 system. Biofilm production was observed and confirmed by the presence of icaA / icaD genes among 61-isolates. Chlorhexidine demonstrated significant effectiveness in vitro at concentration of 0.05% with a short exposure time of 1 minute. In contrast, povidone iodine required higher concentrations and prolonged exposure times to exhibit antibacterial activity. Conclusion: Chlorhexidine was an effective antimicrobial agent against S. epidermidis, particularly when used at clinically available concentrations (0.05%) with short exposure time, whereas povidone-iodine required higher concentrations with prolonged exposure times. Further investigations are warranted to optimize the use of these antiseptics.
Abstract Acne vulgaris, a prevalent disorder of the skin, is found to increase the incidence of suicidal ideation in acne patients (∼7.1%). This creates a dilemma in the mind whether acne is a life ...threatening disease among humans. The main inducer for this multifactorial disease is microbial fluctuation of common resident microbes on the skin with each microbe possessing their own purpose and style in protecting the human body. For acne progression, the microbial population has to get around the defense barriers of the host skin and be able to also resist them in order to survive. These matters have been resolved by their pathogenic lifecycle and associated virulence factors coded within their pathogenic islands in the single circular chromosome. This review addresses the different microbial populations residing in acne lesions and promoting acne by emphasizing their pathogenic mechanisms and the genes associated with virulence factors involved in the development of acne. Model systems such as animal models and cell culture models in studying the pathogenic lifestyle of the microbes are also addressed.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
Staphylococcus aureus and Staphylococcus epidermidis can cause many types of infections, ranging from skin infections to implant‐associated infections. The primary innate immune response against ...bacterial infections involves complement activation, recruitment of phagocytes (most importantly neutrophils), and subsequent killing of the pathogen. However, staphylococci are not innocent bystanders; they actively obstruct this immune attack. To do that, S. aureus secretes several immune‐evasion proteins to resist attack by the innate immune system. Furthermore, S. aureus and S. epidermidis are known for their ability to form biofilms on implanted medical devices and host tissues, which provides another important immune‐evasion mechanism. Understanding these different strategies to resist immune attack will help to develop novel therapies against staphylococcal infections.
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BFBNIB, FZAB, GIS, IJS, KILJ, NLZOH, NUK, OILJ, SBCE, SBMB, UL, UM, UPUK
Staphylococcus epidermidis and Staphylococcus aureus are important causative agents of hospital-acquired infections and bacteremia, likely due to their ability to form biofilms. The production of a ...dense exopolysaccharide (EPS) matrix enclosing the cells slows the penetration of antibiotic down, resulting in therapy failure. The EPS depolymerase (Dpo7) derived from bacteriophage vB_SepiS-phiIPLA7, was overexpressed in Escherichia coli and characterized. A dose dependent but time independent response was observed after treatment of staphylococcal 24 h-biofilms with Dpo7. Maximum removal (>90%) of biofilm-attached cells was obtained with 0.15 μM of Dpo7 in all polysaccharide producer strains but Dpo7 failed to eliminate polysaccharide-independent biofilm formed by S. aureus V329. Moreover, the pre-treatment of polystyrene surfaces with Dpo7 reduced the biofilm biomass by 53-85% in the 67% of the tested strains. This study supports the use of phage-encoded EPS depolymerases to prevent and disperse staphylococcal biofilms, thereby making bacteria more susceptible to the action of antimicrobials.
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