ActivBiotics, Inc. is a private biopharmaceutical company located in Lexington, MA, focused on the discovery, development and commercialization of breakthrough antibacterials for high-value chronic and infectious disease markets. The Company's lead product candidate, rifalazil, is being studied in a pivotal study in patients with intermittent claudication, a manifestation of Peripheral Arterial Disease. The Company's lead pre-clinical compound in its pipeline of novel rifamycins, ABI-0043, shows significant potential for the treatment of infections caused by Gram-positive pathogens, including Staphylococcus aureus and MRSA (methicillin-resistant Staphylococcus aureus).