CAMBRIDGE, Mass.--(BUSINESS WIRE)--Alnylam Pharmaceuticals, Inc. (Nasdaq: ALNY), a leading RNAi therapeutics company, announced today that it has initiated a Phase I human clinical trial of an inhaled formulation of ALN-RSV01 in the U.S. to evaluate its safety, tolerability, and pharmacokinetics in healthy adult volunteers. The inhaled formulation of ALN-RSV01 used in this Phase I study is a nebulized formulation, and advances previous clinical work for ALN-RSV01 administered as an intranasal spray. ALN-RSV01, an un-partnered Alnylam program, is an RNAi therapeutic in clinical development for the treatment of respiratory syncytial virus (RSV) infection.