Effects of Inoculum, pH, and Cations on the In Vitro Activity of Fidaxomicin (OPT-80, PAR-101) against Clostridium difficile

Author:

Babakhani F.1,Seddon J.1,Robert N.1,Shue Y.-K.2,Sears P.1

Affiliation:

1. Departments of Biology

2. Clinical Development, Optimer Pharmaceuticals, Inc., San Diego, California

Abstract

ABSTRACT The effects of the inoculum, pH, cation concentrations, and different lots of commercial media on the in vitro susceptibility of Clostridium difficile to fidaxomicin were examined. Of the factors evaluated, only pH alterations influenced the activity of fidaxomicin against C. difficile , noticeably reducing its activity at higher pH (≥7.9).

Publisher

American Society for Microbiology

Subject

Infectious Diseases,Pharmacology (medical),Pharmacology

Reference21 articles.

1. In Vitro Activity of OPT-80 against Clostridium difficile

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3. Bauer, M. P., A. Goorhuis, T. Koster, S. C. Numan-Ruberg, E. C. Hagen, S. B. Debast, E. J. Kuijper, and J. T. van Dissel. 2008. Community-onset Clostridium difficile-associated diarrhoea not associated with antibiotic usage—two case reports with review of the changing epidemiology of Clostridium difficile-associated diarrhoea. Neth. J. Med.66:207-211.

4. Effect of medium, pH, and inoculum size on activity of ceftizoxime and Sch-34343 against anaerobic bacteria

5. Cohen, M. B. 2009. Clostridium difficile infections: emerging epidemiology and new treatments. J. Pediatr. Gastroenterol. Nutr.48(Suppl.):S63-S65.

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