Consent of Independent Registered Public Accounting Firm
The Board of Directors and
AVI BioPharma, Inc.
We consent to the incorporation by reference in the registration statements (Nos. 333-160922, 333-150021, 333-133211, 333-86778, 333-105412, 333-68502,
333-45888, 333-138299, 333-93135, and 333-86039) on Form S-3 and (Nos. 333-101826, 333-49996, 333-49994, and 333-34047) on Form S-8 of AVI BioPharma, Inc. (a developmental stage company) of our report dated March 14, 2011 with respect to the
balance sheets of AVI BioPharma, Inc. as of December 31, 2010 and 2009 and the related statements of operations, shareholders equity (deficit) and comprehensive income (loss), and cash flows for each of the years in the three-year period
ended December 31, 2010 and the information included in the cumulative from inception presentations for the period January 1, 2002 to December 31, 2010 (not separately presented), and the effectiveness of internal control over
financial reporting as of December 31, 2010, which reports appear in the December 31, 2010 annual report on Form 10-K of AVI BioPharma, Inc.
/s/ KPMG LLP
March 14, 2011