Nabi Biopharmaceuticals Announces Sale of Nabi Biologics to ...( Cash Purchase of Biologics Strategic...)

Cash Purchase of Biologics Strategic Business Unit for $185 Million; Deal

Expected to Close in the Fourth Quarter 2007

BOCA RATON, Fla., Sept. 11 /PRNewswire-FirstCall/ -- Nabi Biopharmaceuticals (Nasdaq: NABI) announced today that it has entered into a definitive agreement with Biotest AG, Dreieich, Germany to sell the Nabi Biologics strategic business unit (SBU) to Biotest Pharmaceuticals Corporation for $185 million. Biotest researches and manufactures pharmaceutical, biotherapeutic and diagnostic products and has more than 1,200 employees worldwide.

Biotest has agreed to acquire the Biologics SBU's products, including Nabi-HB(R) [Hepatitis B Immune Globulin (Human)], and other plasma business assets, including Nabi's state-of-the-art plasma protein production plant, and nine FDA-certified plasma collection centers across the U.S. The acquisition also will include certain of Nabi's Corporate Shared Services group assets and the company's Boca Raton, Florida headquarters and other facilities, as well as the assumption of certain liabilities.

"This agreement definitively puts us on the final path to a successful outcome of our strategic alternatives process," said Dr. Leslie Hudson, Interim President and Chief Executive Officer of Nabi. "We feel this transaction not only will realize value for Nabi shareholders but also will allow us to build on the promise of our Pharmaceuticals SBU pipeline. I am delighted that after the transaction closes our Nabi Biologics and Corporate Shared Services employees will have the prospect of a promising future with Biotest."

"With the acquisition of Nabi Biologics, we have found the ideal complement for our European plasma protein business and
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