POWER OF ATTORNEY

 Know all by these presents, that the undersigned hereby

constitutesand appoints each of James E. Dawson, Michelle L. Basil

and Berry J. Flynn, signing singly, the undersigned's true and

lawful attorney-in-fact to:

(1) execute for and on behalf of the undersigned, in the

undersigned's capacity as an officer and/or director of Nabi

Biopharmaceuticals (the "Company"), Forms 3, 4 and 5 in accordance

 with Section 16(a) of the Securities Exchange Act of 1934 and the

rules thereunder;

(2) do and perform any and all acts for and on behalf of the

undersigned which may be necessary or desirable to complete and

execute any such Form 3, 4 or 5, and timely file such form with

the United States Securities and Exchange Commission and any stock

exchange or similar authority; and

(3) take any other action of any type whatsoever in connection

with the foregoing which, in the opinion of such attorney-in-fact,

may be of benefit to, in the best interest of, or legally required by,

the undersigned, it being understood that the documents executed by

such attorney-in-fact on behalf of the undersigned pursuant to this

Power of Attorney shall be in such form and shall contain such terms

and conditions as such attorney-in-fact may approve in such

attorney-in-fact's discretion.

 The undersigned hereby grants to each such attorney-in-fact

 full power and authority to do and perform any and every act and

thing whatsoever requisite, necessary, or proper to be done in the

exercise of any of the rights and powers herein granted, as fully

to all intents and purposes as the undersigned might or could do if

personally present, with full power of substitution or revocation,

hereby ratifying and confirming all that such attorney-in-fact, or

such attorney-in-fact's substitute or substitutes, shall lawfully

do or cause to be done by virtue of this power of attorney and the

rights and powers herein granted.  The undersigned acknowledges that

the foregoing attorneys-in-fact, in serving in such capacity at the

request of the undersigned, are not assuming, nor is the Company

assuming, any of the undersigned's responsibilities to comply with

Section 16 of the Securities Exchange Act of 1934.

 This Power of Attorney shall remain in full force and effect

until the undersigned is no longer required to file Forms 3, 4 and 5

with respect to the undersigned's holdings of and transactions in

securities issued by the Company, unless earlier revoked by the

undersigned in a signed writing delivered to the foregoing

attorneys-in-fact.



IN WITNESS WHEREOF, the undersigned has caused this Power of

Attorney to be executed as of this __7__ day of June, 2006.





    Signature: /s/ Jordan Siegel

        Jordan I. Siegel