NEW HAVEN, Conn., May 18, 2011 (GLOBE NEWSWIRE) -- Achillion Pharmaceuticals, Inc. (Nasdaq:ACHN), a leader in the discovery and development of small molecule drugs to combat the most challenging infectious diseases, announced that the Company will be added to the NASDAQ Biotechnology Index® (Nasdaq:NBI). The semi-annual re-ranking of the index will become effective when the market opens on Monday, May 23, 2011.
