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Optimer Pharmaceuticals, Inc. (NASDAQ: OPTR) announced today that the U.S. Food and Drug Administration (FDA) has approved the company’s antibacterial drug DIFICID™ (fidaxomicin) tablets for the treatment of Clostridium difficile-associated diarrhea (CDAD) in adults 18 years of age and older. CDAD is a significant medical problem in hospitals and long-term care facilities, and is beginning to emerge in the community among people previously at low risk for the disease. In the largest Phase 3 clinical studies ever conducted in CDAD, DIFICID had clinical response rates at the end of treatment that were non-inferior to oral vancomycin. DIFICID was superior to vancomycin in sustaining clinical response through 25 days beyond the end of treatment. DIFICID is the only FDA-approved antibacterial drug proven to be superior to vancomycin in sustained clinical response for CDAD. To view Multimedia News Release, go to http://multivu.prnewswire.com/mnr/optimerpharma/50177/