**Exhibit 10.24**

**ROYALTY ASSIGNMENT TERMINATION AGREEMENT**

**THISROYALTY ASSIGNMENT TERMINATION AGREEMENT** (this “Agreement”) is made as of November 17, 2010, by and among ACCENTIA BIOPHARMACEUTICALS, INC., a Florida corporation (“Accentia”), BIOVEST INTERNATIONAL, INC.,a Delaware corporation (“Biovest”), ERATO CORP. (“Erato”), VALENS U.S. SPV I, LLC (“Valens U.S.”), VALENS OFFSHORE SPV I, LTD. (“Valens Offshore”), and PSOURCE STRUCTURED DEBTLIMITED (“PSource” and together with Erato, Valens U.S. and Valens Offshore, the “Assignees”). 

**RECITALS**

**WHEREAS**, pursuant to that certain Term Loan and Security Agreement (the “Security Agreement”) dated as of November 17, 2010, by and among Biovest, the Lenders party theretoand LV Administrative Services, Inc., the parties hereto, in consideration for the acceptance by certain of the Prepetition Lenders of the allowed secured claims against Biovest as provided therein, have agreed, among other things, to themodification of the Biovest Royalty; 

**WHEREAS**, Accentia and Biovest have entered into four(4) separate Assignment of Rights Under Royalty Agreements, each dated as of June 18, 2008, with each of the Assignees (collectively, the “Royalty Assignment Agreements”); 

**WHEREAS**, pursuant to the Royalty Assignment Agreements, Accentia assigned and transferred to the Assignees,collectively, 4.00% of the royalty of 19.50% granted to Accentia by Biovest pursuant to that certain Royalty Agreement by and between Biovest and Accentia dated as of October 31, 2006, as amended; 

**WHEREAS**, in order to modify the Biovest Royalty in accordance with the Security Agreement, the Royalty AssignmentAgreements must be terminated; and 

**WHEREAS**, in connection with the modification of the Biovest Royaltyand pursuant to the terms and conditions of the Security Agreement and the Confirmed Plan, the parties hereto hereby desire to terminate the Royalty Assignment Agreements effective as of the date of this Agreement. 

**NOW, THEREFORE**, for good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged,the parties hereto hereby agree as follows: 

1.        Capitalizedterms used but not defined herein shall have the meanings ascribed to them in the Security Agreement. 

2.        The parties hereto agree that the above Recitals are true and correctin all respects. 

3.        The parties hereto hereby consent to thetermination of the Royalty Assignment Agreements (and all of the rights and obligations created thereunder) effective as of the date of this Agreement. 

 
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4.        Each of the Assigneeshereby acknowledges and agrees that it shall have no claims of any nature whatsoever against Biovest or Accentia as a result of the termination of the Royalty Assignment Agreements. 

5.        This Agreement shall be binding upon the parties hereto and theirrespective successors and assigns. The parties hereto agree that this Agreement is fully and adequately supported by consideration, is fair and reasonable, and that they have had the opportunity to discuss this matter with counsel of their choice.This Agreement may be executed in one or more counterparts, each of which shall be deemed an original and all of which together shall be deemed to constitute one agreement. It is understood and agreed that if facsimile copies of this Agreementbearing facsimile signatures are exchanged between the parties hereto, such copies shall in all respects have the same weight, force and legal effect and shall be fully as valid, binding, and enforceable as if such signed facsimile copies wereoriginal documents bearing original signature. 

6.        THISAGREEMENT SHALL BE GOVERNED BY, AND CONSTRUED, INTERPRETED AND ENFORCED ACCORDING TO, THE LAWS OF THE STATE OF NEW YORK, WITHOUT REGARD TO PRINCIPLES OF CONFLICT OF LAWS PROVISIONS THEREOF. ANY ACTION BROUGHT CONCERNING THE TRANSACTIONSCONTEMPLATED BY THIS AGREEMENT SHALL BE BROUGHT ONLY IN THE STATE COURTS OF NEW YORK OR IN THE FEDERAL COURTS LOCATED IN THE STATE OF NEW YORK. The prevailing party shall be entitled to recover from the other party its reasonableattorneys’ fees and costs. Wherever possible each provision of this Agreement shall be interpreted in such manner as to be effective and valid under applicable law, but if any provision of this Agreement shall be prohibited by or invalid undersuch law, such provision shall be ineffective to the extent of such prohibition or invalidity, without invalidating the remainder of such provision or the remaining provisions of this Agreement. 

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**IN WITNESS WHEREOF**, the undersigned have executed this Royalty Assignment TerminationAgreement as of the date first above written. 

 
ACCENTIA BIOPHARMACEUTICALS, INC.By: 
/s/ Samuel S.Duffey
Name: Samuel S. DuffeyTitle: President
 
BIOVEST INTERNATIONAL, INC.By: 
/s/ DavidMoser
Name: David MoserTitle: Secretary
 
ERATO CORP.By: 
/s/ PatrickRegan
Name: Patrick ReganTitle: Authorized Signatory
 
VALENS U.S. SPV I, LLCBy: 
/s/ PatrickRegan
Name: Patrick ReganTitle: Authorized Signatory
 
VALENS OFFSHORE SPV I, LTD.By: 
/s/ PatrickRegan
Name: Patrick ReganTitle: Authorized Signatory
 
PSOURCE STRUCTURED DEBT LIMITEDBy: PSource Capital Ltd, It’s InvestmentConsultant
 
By: 
/s/ CharlesLews
Name: Charles LewsTitle: Associate Director