Pending agreement with regulatory authorities, Trius plans to initiate a Phase 3 program for the treatment of pneumonia in the second half of 2013 using the same 200 mg, once daily dose of tedizolid phosphate that is currently being tested to treat skin infections. In addition, the Company is progressing with enabling studies for its Investigational New Drug (IND) for its Gyrase-B development candidate with potent activity against Gram-negative and Gram-positive bacterial pathogens. A Phase 1 clinical trial is expected to start in 2014.

About Trius Therapeutics

Trius Therapeutics, Inc. is a biopharmaceutical company focused on the discovery, development and commercialization of innovative antibiotics for serious infections. The Company's lead investigational drug, tedizolid phosphate, is a new, novel antibiotic in Phase 3 clinical development for the treatment of ABSSSI and serious Gram-positive infections, including those caused by methicillin-resistant staphylococcus aureus (MRSA). Trius has two Special Protocol Assessments with the FDA for its two Phase 3 ABSSSI trials and has partnered with Bayer Pharma for the development and commercialization of tedizolid phosphate outside of the U.S., Canada and the European Union. In addition to the Company's tedizolid phosphate clinical program, Trius has initiated IND-enabling studies for its Gyrase-B development candidate with potent activity against Gram-negative bacterial pathogens including multi-drug resistant strains of E. coli, Klebsiella, Acinetobacter and Pseudomonas. For more information, visit www.triusrx.com.

Forward-Looking Statements

Statements contained in this press release regarding matters that are not historical facts are "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. Because such statements are subject to risks and uncertainties, actual results may differ materially from those expressed or implied by such forward-looking statements. Such statements include, but are not limited to, statements regarding Trius' ability to successfully complete its ongoing clinical trials and development programs, the timing of reporting top line data for the ESTABLISH 2 study, the timing of Trius' NDA filing, the timing of the initiation of a Phase 3 program for the treatment of pneumonia and the timing of the initiation of a Phase 1 clinical trial for Trius' Gyrase-B development candidate. Risks that contribute to the uncertain nature of the forward-looking statements include: the accuracy of Trius' estimates regarding expenses, future revenues and capital requirements; the success and timing of Trius' preclinical studies and clinical trials; regulatory developments in the United States and foreign countries; changes in Trius' plans to develop and commercialize its product candidates; Trius' ability to obtain additional financing; Trius' ability to obtain and maintain intellectual property protection for its product candidates; and the loss of key scientific or management personnel. These and other risks and uncertainties are described more fully in Trius' most recently filed SEC documents, including its Form 10-K, Forms 10-Q and other documents filed with the United States Securities and Exchange Commission, including those factors discussed under the caption "Risk Factors" in such filings. All forward-looking statements contained in this press release speak only as of the date on which they were made. Trius undertakes no obligation to update such statements to reflect events that occur or circumstances that exist after the date on which they were made.

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