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Optimer Announces Presentation of Additional Data From Fidaxomicin Phase 3 Study for the Treatment of Clostridium Difficile Infection (CDI)
Date:9/15/2009

Current therapeutic options for CDI include metronidazole and oral vancomycin. However, approximately 20% to 30% of CDI patients who initially respond to these treatments experience a clinical recurrence following cessation of antibiotic administration.

Primary risk factors for CDI include broad-spectrum antibiotic use, advanced age (over 65), emerging hyper-virulent strains (BI /NAP1/027, 078, 001) of C. difficile, and previous exposure to CDI that lead to recurrence. Higher incidence, increased treatment failures, and recurrence with standard therapies have resulted in greater awareness and concern of CDI among medical professionals and public health officials.

About Fidaxomicin (OPT-80)

Fidaxomicin is the first in a new class of antibiotics called macrocyclics, which inhibit the bacterial enzyme RNA polymerase, resulting in the death of Clostridium difficile. The narrow spectrum profile of fidaxomicin may eradicate Clostridium difficile selectively with minimal disruption to the normal intestinal flora. This may facilitate the return of the normal physiological conditions in the colon and reduce the probability of CDI recurrence.

About Optimer Pharmaceuticals

Optimer Pharmaceuticals, Inc. is a biopharmaceutical company focused on discovering, developing and commercializing innovative anti-infective products to treat serious infections and address unmet medical needs. Optimer has two late-stage anti-infective product candidates under development. Fidaxomicin, formerly known as OPT-80, is the only antibiotic therapy currently in phase 3 worldwide clinical development for Clostridium difficile infection. Prulifloxacin is an antibiotic which has completed two phase 3 clinical trials for the treatment of travelers' diarrhea, a form of infectious diarrhea. Additional information can be found at http://

SOURCE Optimer Pharmaceuticals, Inc.
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