scholarly journals In-vitro activities of five plant essential oils against methicillin- resistant Staphylococcus aureus and vancomycin-resistant Enterococcus faecium

1997 ◽  
Vol 40 (2) ◽  
pp. 305-306 ◽  
Author(s):  
R. Nelson
Keyword(s):  
Staphylococcus Aureus ◽  
Essential Oils ◽  
Enterococcus Faecium ◽  
Methicillin Resistant Staphylococcus Aureus ◽  
Vancomycin Resistant Enterococcus ◽  
Methicillin Resistant ◽  
Plant Essential Oils ◽  
Vancomycin Resistant

scholarly journals Antimicrobial Constituents from Machaerium Pers.: Inhibitory Activities and Synergism of Machaeriols and Machaeridiols against Methicillin-Resistant Staphylococcus aureus, Vancomycin-Resistant Enterococcus faecium, and Permeabilized Gram-Negative Pathogens

Molecules ◽  
2020 ◽  
Vol 25 (24) ◽  
pp. 6000
Author(s):  
Ilias Muhammad ◽  
Melissa R. Jacob ◽  
Mohamed A. Ibrahim ◽  
Vijayasankar Raman ◽  
Mallika Kumarihamy ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Enterococcus Faecium ◽  
Methicillin Resistant Staphylococcus Aureus ◽  
Polymyxin B ◽  
Synergistic Activity ◽  
Vancomycin Resistant Enterococcus ◽  
Methicillin Resistant ◽  
Vancomycin Resistant ◽  
Mrsa Strains

Two new epimeric bibenzylated monoterpenes machaerifurogerol (1a) and 5-epi-machaerifurogerol (1b), and four known isoflavonoids (+)-vestitol (2), 7-O-methylvestitol (3), (+)-medicarpin (4), and 3,8-dihydroxy-9-methoxypterocarpan (5) were isolated from Machaerium Pers. This plant was previously assigned as Machaerium multiflorum Spruce, from which machaeriols A-D (6–9) and machaeridiols A-C (10–12) were reported, and all were then re-isolated, except the minor compound 9, for a comprehensive antimicrobial activity evaluation. Structures of the isolated compounds were determined by full NMR and mass spectroscopic data. Among the isolated compounds, the mixture 10 + 11 was the most active with an MIC value of 1.25 μg/mL against methicillin-resistant Staphylococcus aureus (MRSA) strains BAA 1696, −1708, −1717, −33591, and vancomycin-resistant Enterococcus faecium (VRE 700221) and E. faecalis (VRE 51299) and vancomycin-sensitive E. faecalis (VSE 29212). Compounds 6–8 and 10–12 were found to be more potent against MRSA 1708, and 6, 11, and 12 against VRE 700221, than the drug control ciprofloxacin and vancomycin. A combination study using an in vitro Checkerboard method was carried out for machaeriols (7 or 8) and machaeridiols (11 or 12), which exhibited a strong synergistic activity of 12 + 8 (MIC 0.156 and 0.625 µg/mL), with >32- and >8-fold reduction of MIC’s, compared to 12, against MRSA 1708 and −1717, respectively. In the presence of sub-inhibitory concentrations on polymyxin B nonapeptide (PMBN), compounds 10 + 11, 11, 12, and 8 showed activity in the range of 0.5–8 µg/mL for two strains of Acinetobacter baumannii, 2–16 µg/mL against Pseudomonas aeruginosa PAO1, and 2 µg/mL against Escherichia coli NCTC 12923, but were inactive (MIC > 64 µg/mL) against the two isolates of Klebsiella pneumoniae.

scholarly journals Case Report of a Successful Treatment of Methicillin-Resistant Staphylococcus aureus (MRSA) Bacteremia and MRSA/Vancomycin-Resistant Enterococcus faecium Cholecystitis by Daptomycin

2011 ◽  
Vol 55 (5) ◽  
pp. 2458-2459 ◽  
Author(s):  
Carlo Tascini ◽  
Antonello Di Paolo ◽  
Marialuisa Polillo ◽  
Mauro Ferrari ◽  
Paola Lambelet ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Enterococcus Faecium ◽  
Methicillin Resistant Staphylococcus Aureus ◽  
Drug Dose ◽  
Vancomycin Resistant Enterococcus ◽  
Bacterial Strains ◽  
Methicillin Resistant ◽  
Content Type ◽  
Bile Concentration ◽  
Vancomycin Resistant

ABSTRACTA 72-year-old man, receiving 8 mg daptomycin/kg body weight/day for methicillin-resistantStaphylococcus aureus(MRSA) bacteremia, was diagnosed with MRSA/vancomycin-resistantEnterococcus faecium(VRE) cholecystitis (daptomycin MIC values, 1 and 2 mg/liter, respectively). After the fifth drug dose, the bile concentration of daptomycin was 66 mg/liter 5 min after drug administration, with the biliary concentration/MIC values higher than 30 for both bacterial strains. Therefore, daptomycin achieved therapeutic levels in bile, hence suggesting a role for the drug in the treatment of MRSA/VRE cholecystitis.

scholarly journals Comparison of Linezolid Activities under Aerobic and Anaerobic Conditions against Methicillin-Resistant Staphylococcus aureus and Vancomycin-Resistant Enterococcus faecium

2003 ◽  
Vol 47 (1) ◽  
pp. 398-399 ◽  
Author(s):  
Brent W. Gunderson ◽  
Khalid H. Ibrahim ◽  
Charles A. Peloquin ◽  
Laurie B. Hovde ◽  
John C. Rotschafer
Keyword(s):  
Staphylococcus Aureus ◽  
Enterococcus Faecium ◽  
Methicillin Resistant Staphylococcus Aureus ◽  
Anaerobic Conditions ◽  
Methicillin Resistant ◽  
Vancomycin Resistant ◽  
Model Drug ◽  
Aerobic And Anaerobic ◽  
Aerobic And Anaerobic Conditions

ABSTRACT Methicillin-resistant Staphylococcus aureus and vancomycin-resistant Enterococcus faecium were exposed to linezolid (MIC of 2 mg/liter) under aerobic or anaerobic conditions in an in vitro pharmacodynamic model. Drug concentration and half-life were adjusted to simulate clinical dosing (600 mg twice daily) of linezolid. Linezolid produced a 2-log10 killing at 24 h, and rates of killing against each of these facultative organisms as measured by mean survival time appeared similar under aerobic and anaerobic conditions.

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