scholarly journals Detection of Vancomycin Resistance among Enterococcus faecalis and Staphylococcus aureus

Author(s):  
Ramya Rengaraj
Molecules ◽  
2018 ◽  
Vol 23 (12) ◽  
pp. 3195 ◽  
Author(s):  
Yingyu Wang ◽  
Xiaowei Li ◽  
Yang Wang ◽  
Stefan Schwarz ◽  
Jianzhong Shen ◽  
...  

The optrA gene, which confers transferable resistance to oxazolidinones and phenicols, is defined as an ATP-binding cassette (ABC) transporter but lacks transmembrane domains. The resistance mechanism of optrA and whether it involves antibiotic efflux or ribosomal protection remain unclear. In this study, we determined the MIC values of all bacterial strains by broth microdilution, and used ultra-high performance liquid chromatography-tandem quadrupole mass spectrometry to quantitatively determine the intracellular concentrations of linezolid and florfenicol in Enterococcus faecalis and Staphylococcus aureus. Linezolid and florfenicol both accumulated in susceptible strains and optrA-carrying strains of E. faecalis and S. aureus. No significant differences were observed in the patterns of drug accumulation among E. faecalis JH2-2, E. faecalis JH2-2/pAM401, and E. faecalis JH2-2/pAM401+optrA, but also among S. aureus RN4220, S. aureus RN4220/pAM401, and S. aureus RN4220/pAM401+optrA. ANOVA scores also suggested similar accumulation conditions of the two target compounds in susceptible strains and optrA-carrying strains. Based on our findings, the mechanism of optrA-mediated resistance to oxazolidinones and phenicols obviously does not involve active efflux and the OptrA protein does not confer resistance via efflux like other ABC transporters.


2001 ◽  
Vol 42 (4) ◽  
pp. 264-268 ◽  
Author(s):  
Marinella S. Laport ◽  
Angela C.D. de Castro ◽  
Adriana Villardo ◽  
Jose Abelardo C. Lemos ◽  
Maria do Carmo F. Bastos ◽  
...  

2020 ◽  
Author(s):  
Trishnika Chakraborty ◽  
Sonali Taneja

Abstract For successful endodontic treatment, the antimicrobial property of endodontic filling is mandatory. Hence, the aim of this in vitro study was to assess the antibacterial efficacy of three endodontic sealers on Enterococcus faecalis, Candida albicans and Staphylococcus aureus by direct contact test (DCT).Materials and MethodsThe antimicrobial efficacy of three different sealers, AH Plus, MTA Fillapex and Endo Sequence BC, was tested against Enterococcus faecalis ATCC 29212, Candida albicans ATCC 10231 and Staphylococcus aureus ATCC 25923 by DCT. Freshly mixed sealers were placed in flat bottom test tubes incubated at 37°C. Thereafter, 10 μL of suspension was drawn and spread over culture plates to determine the colony count using a digital colony counter. Readings were taken at 1 hr (fresh specimen), and then at 24 hrs (after setting). The results were tabulated, and statistical analysis was performed using one-way ANOVA and Tukey’s HSD test.ResultsDCT showed a significant decrease in microbial count in AH Plus, MTA Fillapex and Endoseq BC at both time intervals. Group 3 (Endosequence BC) showed minimum microbial count followed by Group 2 (MTA Fillapex) and maximum microbial count for Group 1 (AH Plus) for both time intervals (1 hour and 24 hours).ConclusionEndosequence BC showed maximum antimicrobial efficacy against all the tested microorganisms for both time intervals, followed by MTA Fillapex and AH Plus.


Author(s):  
Tsahel H AL.Dulaimi ◽  
Zainab A Tolaifeh ◽  
Hawraa Kadhim ◽  
Nisreen Kaddim Radi ◽  
Israa Adnan ◽  
...  

This study was carried out to investigate the bacterial causes of appendicitis in patients referred to Hilla General Education Hospital of both genders and for all ages. The aim of the study was to diagnose positive and negative gram bacteria and to estimate someof immunological factors. The results of the current study,which examined the contents of 80 surgical removed appendix, Half of samples were positive for bacterialcultivation. The gram negativewere isolated by 81.25%,which included E. coli (43.75%),Shigella dysenteriae (37.5%) and positive gram bacteria (18.75%),which included Enterococcus faecalis (12.5%) and Staphylococcus aureus (6.25%). Women accounted for the highest percentage (55%),while the percentage of males (45%) was the highest age group (18-27) compared to other age groups (35%). The higher concentration of IgA, C3and C4 at age group (18-27) about 559.86±27.6, 177.3±8.77 and 55.5±2.53 respectively.


2010 ◽  
Vol 24 (4) ◽  
pp. 406-412 ◽  
Author(s):  
Tatiana Kelly da Silva Fidalgo ◽  
Roberta Barcelos ◽  
Maristela Barbosa Portela ◽  
Rosangela Maria de Araújo Soares ◽  
Rogério Gleiser ◽  
...  

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