ROCKVILLE, Md., Aug. 23, 2012 (GLOBE NEWSWIRE) -- Nabi Biopharmaceuticals (Nasdaq:NABI) announced today that it is sending a letter to its stockholders, a copy of which is included below. The letter is in response to the statements made by Mangrove Partners Fund, L.P. and urges Nabi's stockholders to vote their WHITE proxy card accompanying Nabi's definitive proxy statement, dated August 7, 2012, which was mailed to the stockholders in connection with the special meeting of Nabi's stockholders to be held on September 24, 2012.