WATERTOWN, Mass.--(BUSINESS WIRE)--Tetraphase Pharmaceuticals, Inc. (NASDAQ:TTPH), a clinical-stage biopharmaceutical company developing novel antibiotics for serious and life-threatening multidrug-resistant (MDR) bacterial infections, today announced that it has been selected for addition to the NASDAQ Biotechnology Index® (Nasdaq:^NBI). The annual re-ranking of the NASDAQ Biotechnology Index will become effective upon market open on Monday, December 22, 2014.
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