A comparative study of the in vitro activities of XRP 2868, a new oral streptogramin, against 266 anaerobic gram-positive clinical isolates using the agar dilution method showed that the XRP 2868 MICs for 95% (254 of 266) of isolates were < or =0.5 microg/ml. XRP 2868 MICs for only two strains, one being Clostridium clostridioforme (MIC, 16 microg/ml) and the other being Clostridium difficile (MIC, 32 microg/ml), were >2 microg/ml. Depending on its pharmacokinetics and pharmacodynamics, XRP 2868 has potential for use against infections with gram-positive anaerobes and deserves further clinical evaluation.
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http://dx.doi.org/10.1128/AAC.49.1.408-413.2005 | DOI Listing |
Antimicrob Agents Chemother
November 2006
Department of Pathology, Hershey Medical Center, P.O. Box 850, Hershey, PA 17033, USA.
The activity of NXL103 against 108 strains of Haemophilus influenzae was tested using Haemophilus test media (HTM) obtained from various sources. With the exception of those obtained with stored HTM, MICs did not differ significantly, with MIC(50) and MIC(90) values of 0.5 and 0.
View Article and Find Full Text PDFAntimicrob Agents Chemother
January 2006
Department of Medicine, Section of Infectious Diseases, University of Wisconsin School of Medicine, Room H4/570, 600 Highland Ave., Madison, Wisconsin 53792, USA.
XRP 2868 is a new streptogramin antibiotic with broad-spectrum activity against gram-positive cocci. We used the neutropenic murine thigh and lung infection models to characterize the time course of antimicrobial activity of XRP 2868 and determine which pharmacokinetic/pharmacodynamic (PK/PD) parameter and magnitude best correlated with efficacy. Serum levels following four two- to fourfold-escalating single-dose levels of XRP 2868 were measured by liquid chromatography mass spectrometry assay.
View Article and Find Full Text PDFCurr Microbiol
December 2005
Department of Biochemistry and Molecular Biology, J.H. Quillen College of Medicine, East Tennessee State University, Johnson City, TN 37614, USA.
A new streptogramin antibiotic XRP 2868 was compared with quinupristin-dalfopristin for inhibitory activities against antibiotic-resistant Haemophilus influenzae, Staphylococcus aureus, and Streptococcus pneumoniae. In each organism examined, XRP 2868 had an IC(50) that was twofold to fivefold lower than quinupristin-dalfopristin, for inhibition of cell viability, protein synthesis, and ribosomal subunit formation.
View Article and Find Full Text PDFAntimicrob Agents Chemother
January 2005
R. M. Alden Research Laboratory, 2021 Santa Monica Blvd., Suite 740 East, Santa Monica, CA 90404, USA.
A comparative study of the in vitro activities of XRP 2868, a new oral streptogramin, against 266 anaerobic gram-positive clinical isolates using the agar dilution method showed that the XRP 2868 MICs for 95% (254 of 266) of isolates were < or =0.5 microg/ml. XRP 2868 MICs for only two strains, one being Clostridium clostridioforme (MIC, 16 microg/ml) and the other being Clostridium difficile (MIC, 32 microg/ml), were >2 microg/ml.
View Article and Find Full Text PDFAntimicrob Agents Chemother
October 2003
Department of Pathology, Hershey Medical Center, Hershey, Pennsylvania 17033, USA.
MIC methodology was used to test the antibacterial activity of XRP 2868, a new oral combination of two semisynthetic streptogramins, RPR 132552A and RPR 202868, compared to activities of other antibacterial agents against pneumococci, Haemophilus influenzae, and Haemophilus parainfluenzae. For 261 pneumococci, XRP 2868 and pristinamycin MICs were similar, irrespective of penicillin G and erythromycin A susceptibilities (MIC at which 50% of isolates were inhibited [MIC(50)], 0.25 micro g/ml; MIC(90), 0.
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