Document:

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                                                                     EXHIBIT 4.2

                                    INDENTURE
                                       FOR
                             SENIOR DEBT SECURITIES
                            DATED AS OF MARCH 1, 2001

                               -------------------

     This Indenture, dated as of the first day of March, 2001, between Household
Finance Corporation, a corporation duly organized and existing under the laws of
the State of Delaware (hereinafter called the "Company") and having its
principal office at 2700 Sanders Road, Prospect Heights, Illinois 60070, and The
Chase Manhattan Bank, a banking corporation organized and existing by virtue of
the banking laws of the State of New York (hereinafter called the "Trustee"),
and having its principal Corporate Trust Office in The City of New York, New
York, which office, at the date hereof, is located at 450 West 33rd Street, New
York, New York 10001.

                                   WITNESSETH:

     WHEREAS, the Company deems it necessary from time to time to borrow money
for its corporate purposes and to issue its debt securities therefor, and to
that end has duly authorized and directed the execution and delivery of this
Indenture to provide for one or more series of its unsecured debentures, notes,
or other evidences of indebtedness, issuable as provided herein;

     WHEREAS, the Company desires to create a series of Notes to be issuable
under this Indenture and to be known as the HFC InterNotes(SM) (hereinafter the
"InterNotes"), due nine months or more from date of issue and to be unlimited in
aggregate principal amount, and the terms and provisions thereof to be as
hereinafter set forth; and

     WHEREAS, all things necessary to make the InterNotes, when executed by the
Company and authenticated and delivered by the Trustee and duly issued by the
Company, the valid obligations of the Company, and to make this Indenture a
valid agreement of the Company, in accordance with their and its terms, have
been done.

     NOW, THEREFORE, THIS INDENTURE WITNESSETH:

     For and in consideration of the premises and the purchase of Notes to be
issued hereunder by Holders thereof, it is mutually covenanted and agreed, for
the equal and proportionate benefit of all Holders of the Notes or of series
thereof, as follows:

     Article 1. Standard Provisions. Except as specifically set forth herein,
all of the terms, conditions, covenants and provisions contained in the
Company's Standard Multiple-Series Indenture Provisions for Senior Debt
Securities dated as of June 1, 1992 (the "Provisions"), a copy of which is
attached hereto, are incorporated herein by reference in their entirety and,
except as specifically noted herein, shall be deemed to be a part hereof to the
same capitalized terms which are used herein and not otherwise defined herein
are defined in the Provisions and are used herein with the same

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meanings as in the Provisions. The Provisions, together with this Indenture, are
deemed to be the "Indenture."

     Article 2. Conflicts. As provided in Section 8.08(b) of the Provisions, the
following indentures are excluded:

     Indentures dated as of October 1, 1992 and December 1, 1993 between the
     Company and the Trustee

     Article 3. Designation and Terms of the InterNotes. A series of Notes
created pursuant to this Indenture shall be known and designated as the "HFC
InterNotes" of the Company.

     Each InterNote will be dated and issued as of the date of its
authentication by the Trustee. Each InterNote shall also bear an Original Issue
Date (as hereinafter defined) which, with respect to any InterNote (or any
portion thereof), shall mean the date of its original issue, as specified in
such InterNote (the "Original Issue Date"), and such Original Issue Date shall
remain the same if such InterNote is subsequently issued upon transfer,
exchange, or substitution of such InterNote regardless of its date of
authentication. Principal of any InterNote shall become due and payable on such
date nine months or more from the Original Issue Date of such Note, as specified
on such Note. Interest rates will be subject to change from time to time, but no
such change will affect any InterNote theretofore issued. Interest shall be
computed on the basis specified in each InterNote.

     Each InterNote will bear interest from the Original Issue Date, or from the
most recent date to which interest has been paid or duly provided for, at the
rate per annum stated therein until the principal thereof is paid or made
available for payment. Interest will be payable either monthly, quarterly,
semi-annually or annually on each Interest Payment Date and at Maturity.
Interest will be payable to the person in whose name a Note is registered at the
close of business on the Regular Record Date next preceding each Interest
Payment Date; provided, however, interest payable at Maturity will be payable to
the person to whom principal shall be payable. Interest on the InterNote will be
computed on the basis of a 360-day year of twelve 30-day months.

     The Interest Payment Dates for an InterNote that provides for monthly
interest payments shall be the fifteenth day of each calendar month beginning in
the first calendar month following the month the InterNote was issued. In the
case of an InterNote that provides for quarterly interest payments, the Interest
Payment Dates shall be the fifteenth day of every third month, beginning in the
third calendar month following the month the InterNote was issued. In the case
of an InterNote that provides for semi-annual interest payments, the Interest
Payment Dates shall be the fifteenth day of every sixth month, beginning in the
sixth calendar month following the month the InterNote was issued. In the case
of an InterNote that provides for annual interest payments, the Interest Payment
Dates shall be the fifteenth day of every twelfth month, beginning in the
twelfth calendar month following the month the InterNote was issued. The Regular
Record Date referred to in Section 2.07 of the Provisions with respect to any
Interest Payment Date will be the first day of the calendar month (whether or
not a Business Day) in which such Interest Payment Date occurs, except that the
Regular Record Date with respect to the final Interest Payment Date will be the
final Interest Payment Date.

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     Payment of principal of the InterNotes and, unless otherwise paid as
hereinafter provided, the interest thereon will be made at the office or agency
of the Company in New York, New York; provided, however, that payment of
interest may be made at the option of the Company by check or draft mailed to
the Person entitled thereto at his address appearing in the Note Register or by
wire transfer to an account designated by such Person to the Paying Agent not
later than ten days prior to the date of such payment.

     Unless otherwise specified in an InterNote, the cities of New York, New
York and Chicago, Illinois shall be the reference cities for determining a
Business Day.

     The InterNotes may be issued only as registered notes, without coupons, in
minimum denominations of $1,000 and any larger denomination which is an integral
multiple of $1,000.

     Upon the execution of this Indenture, or from time to time thereafter,
InterNotes, without limitation as to aggregate principal amount, may be executed
by the Company and delivered to the Trustee for authentication, and the Trustee
shall thereupon authenticate and deliver said InterNotes to or upon a Company
Order.

     Article 4. Redemption of InterNotes. Each InterNote may be redeemed by the
Company in whole or in part if so provided pursuant to the terms of such
InterNote issued by the Company. Notwithstanding the provisions of Section 5.03
of the Provisions, the Company may redeem any InterNote which by its terms is
redeemable prior to Stated Maturity without also redeeming any other InterNote
which is redeemable prior to Stated Maturity. The selection of InterNotes to be
redeemed prior to Stated Maturity shall be in the sole discretion of the
Company.

     Article 5. Repayment of InterNotes at Option of Holders. Each InterNote
shall be subject to repayment by the Company at the option of the Holder prior
to its Stated Maturity if so provided pursuant to the terms of such InterNote
issued by the Company, on such terms as set forth in such InterNote.

     Article 6. Survivor's Option. If so specified in any InterNote, the
representative of a deceased beneficial owner of the InterNote or a beneficial
interest in the InterNote shall have the option to elect repayment of such
InterNote or interest following the death of the owner (a "Survivor's Option").
Unless otherwise specifically provided for on the face of the InterNote, no
Survivor's Option may be exercised if the deceased owner of the InterNote or a
beneficial interest in the InterNote has held such InterNote or interest for
less than six months prior to that owner's death.

     Pursuant to exercise of the Survivor's Option, the Company shall repay any
InterNote (or portion thereof) properly tendered for repayment by or on behalf
of the person (the "Representative") that has authority to act on behalf of the
deceased beneficial owner of such InterNote under the laws of the appropriate
jurisdiction (including, without limitation, the personal representative,
executor, surviving joint tenant or surviving tenant by the entirety of such
deceased beneficial owner) at a price equal to 100% of the principal amount of
the beneficial interest of the deceased owner in such InterNote plus accrued
interest to the date of such repayment, subject to the following limitations:

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          (a) The Company may, in its sole discretion, limit the aggregate
     principal amount of InterNotes as to which exercises of the Survivor's
     Option shall be accepted in any calendar year (the "Annual Put Limitation")
     to the greater of 2% of the Outstanding principal amount of the InterNotes
     as of the end of the most recent calendar year or $2,000,000. The Company
     in its sole discretion may also limit to $250,000 for any calendar year,
     the aggregate principal amount of InterNotes (or portions thereof) as to
     which exercise of the Survivor's Option will be accepted with respect to
     any individual deceased owner of beneficial interests in such InterNotes
     (the "Individual Put Limitation").

          (b) The Company shall not make principal repayments pursuant to
     exercise of the Survivor's Option in amounts that are less than $1,000, or
     other than in integral multiples of $1,000.

          (c) Any InterNote (or portion thereof) tendered pursuant to a valid
     exercise of the Survivor's Option may not be withdrawn.

     Each InterNote (or portion thereof) that is tendered pursuant to valid
exercise of the Survivor's Option shall be accepted promptly in the order all
such InterNotes are tendered, except for any InterNote (or portion thereof) the
acceptance of which would contravene (i) the Annual Put Limitation, if applied,
or (ii) the Individual Put Limitation, if applied, with respect to the relevant
individual deceased owner of beneficial interests therein. If, as of the end of
any calendar year, the aggregate principal amount of InterNotes (or portions
thereof) that have been accepted pursuant to exercise of the Survivor's Option
during such year has exceeded either the Annual Put Limitation, if applied, or
the Individual Put Limitation, if applied, for such year, any exercise(s) of the
Survivor's Option with respect to InterNotes (or portions thereof) not accepted
during such calendar year because such acceptance would have contravened either
such limitation, if applied, shall be deemed to be tendered in the following
calendar year in the order all such InterNotes (or portions thereof) were
tendered. Unless otherwise specified in such InterNote, any InterNote (or
portion thereof) accepted for repayment pursuant to exercise of the Survivor's
Option shall be repaid on the first Interest Payment Date that occurs 20 or more
calendar days after the date of such acceptance.

     In order for a Survivor's Option to be validly exercised with respect to
any InterNote (or portion thereof), the Trustee must receive from the
Representative of the deceased owner (i) a written request for repayment signed
by the Representative, and such signature must be guaranteed by a member firm of
a registered national securities exchange or of the National Association of
Securities Dealers, Inc. (the "NASD") or a commercial bank or trust company
having an office or correspondent in the United States, (ii) tender of an
InterNote (or portion thereof) to be repaid, (iii) appropriate evidence
satisfactory to the Trustee and the Company that (A) the deceased was the owner
of a beneficial interest in such InterNote at the time of death and for at least
six months prior to such owner's death, (B) the death of such beneficial owner
has occurred and (C) the Representative has authority to act on behalf of the
deceased beneficial owner, (iv) if applicable, a properly executed assignment or
endorsement, and (v) if the beneficial interest in such InterNote is held by a
nominee of the deceased beneficial owner, a certificate or letter satisfactory
to the Trustee and the Company from such nominee attesting to the deceased's
ownership of a beneficial interest in such InterNote, and (vi) tax waivers and
such

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other instruments or documents that the Trustee or the Company reasonably
requires in order to establish the validity of ownership of the InterNotes and
the claimant's entitlement to payment. Notwithstanding the foregoing, the
eligibility or validity of any exercise of the Survivor's Option, shall be
subject to the final approval of the Company, in its sole discretion, which
final approval shall be final and binding on all parties. In the event that an
InterNote (or any portion thereof) tendered for repayment pursuant to valid
exercise of the Survivor's Option is not accepted, the Trustee shall deliver a
notice by first-class mail to the Representative, that states the reason such
InterNote (or portion thereof) has not been accepted for payment.

     The death of a person owning an InterNote in joint tenancy or tenancy by
the entirety with another or others shall be deemed the death of the owner of
the InterNote, and the entire principal amount of the InterNote so held shall be
subject to repayment, together with interest accrued thereon to the repayment
date. The death of a person owning an InterNote by tenancy in common shall be
deemed the death of an owner of an InterNote only with respect to the deceased
owner's interest in the InterNote so held by tenancy in common; except that in
the event an InterNote is held by husband and wife as tenants in common, the
death of either shall be deemed the death of the owner of the InterNote, and the
entire principal amount of the InterNote so held shall be subject to repayment.
The death of a person who, during his or her lifetime, was entitled to
substantially all of the beneficial interests of ownership of an InterNote,
shall be deemed the death of the owner thereof for purposes of this provision,
regardless of the registered holder, if such beneficial interest can be
established to the satisfaction of the Trustee and the Company. Such beneficial
interest shall be deemed to exist in typical cases of nominee ownership,
ownership under the Uniform Transfers to Minors Act, community property or other
joint ownership arrangements between a husband and wife and custodial and trust
arrangements where one person has substantially all of the beneficial ownership
interest in the InterNote during his or her lifetime.

     For InterNotes represented by a Global Note, the Depository or its nominee
shall be the holder of such InterNote and therefore shall be the only entity
that can exercise the Survivor's Option for such InterNote. To obtain repayment
pursuant to exercise of the Survivor's Option with respect to such InterNote,
the Representative must provide to the broker or other entity through which the
beneficial interest in such InterNote is held by the deceased owner (i) the
documents described in clauses (i), (iii) and (vi) of the second preceding
paragraph and (ii) instructions to such broker or other entity to notify the
Depository of such Representative's desire to obtain repayment pursuant to
exercise of the Survivor's Option. Such broker or other entity shall provide to
the Trustee (i) the documents received from the Representative referred to in
clause (i) of the preceding sentence and (ii) a certificate satisfactory to the
Trustee from such broker or other entity stating that it represents the deceased
beneficial owner. Such broker or other entity shall be responsible for
disbursing any payments it receives pursuant to exercise of the Survivor's
Option to the appropriate Representative.

     Article 7. Global Notes. The InterNotes will be issued initially in the
form of Global Notes. "Global Note" means a registered Note evidencing one or
more InterNotes, issued to the Depository for such InterNotes in accordance with
this Article and bearing the legend prescribed in this Article. A single Global
Note will represent all Notes issued on the same day and having the same terms,
including, but not limited to, the same Interest Payment Dates, rate of
interest, Stated Maturity, and redemption or repayment provisions (if any),
including any Survivor's

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Option. The Company shall execute and the Trustee shall, in accordance with this
Article and the Company Order with respect to the InterNotes, authenticate and
deliver one or more Global Notes in temporary or permanent form that (i) shall
represent and shall be denominated in an aggregate amount equal to the aggregate
principal amount of the InterNotes to be represented by one or more Global
Notes, (ii) shall be registered in the name of the Depository for such Global
Note or Notes or the nominee of such Depository, (iii) shall be delivered by the
Trustee to such Depository or pursuant to such Depository's instructions and
(iv) shall bear a legend substantially to the following effect in addition to
the legend required by Section 2.11(a) of the Provisions: "Unless this Global
Note is presented by an authorized representative of the Depository to the
Issuer or its agent for registration of transfer, exchange or payment, and any
InterNote issued is registered in the name of the Depository or in such other
name as is requested by the Depository, any transfer, pledge or other use hereof
for value or otherwise by or to any person shall be wrongful inasmuch as the
registered owner hereof, the Depository, has an interest herein.

     Notwithstanding Section 2.05 of the Provisions, unless and until it is
exchanged in whole or in part for Notes in definitive form, a Global Note
representing one or more InterNotes may not be transferred except as a whole by
the Depository, to a nominee of such Depository or by a nominee of such
Depository to such Depository or another nominee of such Depository or by such
Depository or any such nominee to a successor Depository for the InterNotes or a
nominee of such successor Depository.

     The third paragraph of Section 2.05 of the Provisions shall not apply to
InterNotes issued in the form of Global Notes.

     If at any time the Depository for the InterNotes notifies the Company that
it is unwilling or unable to continue as Depository for the InterNotes or if at
any time the Depository for the InterNotes shall no longer be registered or in
good standing under the Securities Exchange Act of 1934, as amended, or other
applicable statute or regulation, the Company shall appoint a successor
Depository with respect to the InterNotes. If a successor Depository for the
InterNotes is not appointed by the Company within 90 days after the Company
receives such notice or becomes aware of such ineligibility, the Company will
execute, and the Trustee, upon receipt of a Company Order for the authentication
and delivery of definitive InterNotes, will authenticate and deliver InterNotes
in definitive form in an aggregate principal amount equal to the principal
amount of the Global Note or Notes representing such InterNotes in exchange for
such Global Note or Notes.

     The Company may at any time and in its sole discretion determine that the
InterNotes issued in the form of one or more Global Notes shall no longer by
represented by such Global Note or Notes. In such event the Company will
execute, and the Trustee, upon receipt of a Company Order for the authentication
and delivery of definitive InterNotes will authenticate and deliver InterNotes
in definitive form in an aggregate principal amount equal to the principal
amount of the Global Note or Notes representing such InterNotes in exchange for
such Global Note or Notes.

     The Depository for such InterNotes may surrender a Global Note or Notes for
such InterNotes in exchange in whole or in part for InterNotes in definitive
form on such terms as are

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acceptable to the Company and such Depository. Thereupon, the Company shall
execute, and the Trustee shall authenticate and deliver, without service charge:

               (i) to each Person specified by such Depository a new InterNote
          or Notes, of any authorized denomination as requested by such Person
          in aggregate principal amount equal to and in exchange for such
          Person's beneficial interest in the Global Note; and

               (ii) to such Depository a new Global Note in a denomination equal
          to the difference, if any, between the principal amount of the
          surrendered Global Note and the aggregate principal amount of
          InterNotes delivered to Holders thereof.

     In any exchange provided for in this Article, the Company will execute and
the Trustee will authenticate and deliver InterNotes in definitive registered
form in authorized denominations.

     Upon the exchange of a Global Note for InterNotes in definitive form, such
Global Note shall be cancelled by the Trustee. InterNotes issued in exchange for
a Global Note pursuant to this Article shall be registered in such names and in
such authorized denominations as the Depository for such Global Note, pursuant
to instructions from its direct or indirect participants or otherwise, shall
instruct the Trustee. The Trustee shall deliver such InterNotes to the persons
in whose names such InterNotes are so registered.

     Article 8. Amendments. Notwithstanding Articles II and XI of the
Provisions, the Company may, by Board Resolution or by Supplemental Indenture,
amend this Indenture to provide for additional definitions, terms and provisions
relating to InterNotes. Any such Board Resolution or Supplemental Indenture will
not adversely affect the rights and privileges of Holders of InterNotes issued
prior to such Board Resolution or Supplemental Indenture and shall not affect
the Trustee's own rights, duties or immunities under this Indenture or otherwise
without its prior written consent.

     Article 9. Amendments to the Provisions. The Provisions, as incorporated
herein are hereby amended as follows:

     A. The following language is hereby inserted at the end of the definition
of "Indenture" in Section 1.01: "The term "Indenture" also includes the terms of
particular series of Notes established as contemplated by Section 2.01".

     B. Section 1.12 is hereby restated in its entirety to read as follows:

        "Section 1.12. The Indenture and each Note issued hereunder shall be
   construed in accordance with and governed by the laws of the State of
   Illinois, provided that the immunities and standard of care of the Trustee
   in connection with the administration of its trusts hereunder shall be
   construed in accordance with and governed by the laws of the State of New
   York.

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     C. The last paragraph of Section 6.03 is hereby amended to change the
references to Sections 2.06 and 2.07 to Sections 2.05 and 2.06.

     D. Section 7.12, prior to the proviso, is hereby restated in its entirety
to read as follows:

        "Section 7.12. The Holders of a majority in principal amount of the
   Outstanding Notes of a series shall have the right to direct the time,
   method and place of conducting any proceeding for any remedy available to
   the Trustee or exercising any trust or power conferred on the Trustee with
   respect to such series,"

     E. Section 8.01(c) is hereby amended by adding the words "of a series"
after the words "Outstanding Notes" on the fourth line of clause (3) thereof and
by adding the words "with respect to such series" on the seventh line of clause
(3) thereof after the word "Indenture".

                                   TESTIMONIUM

     This Indenture may be executed in any number of counterparts, each of which
so executed shall be deemed to be an original, but all such counterparts shall
together constitute but one and the same instrument.

     IN WITNESS WHEREOF, the parties hereto have caused this Indenture to be
duly executed and their respective corporate seals to be hereunto affixed and
attested, all as of the day and year first written above.

                                        HOUSEHOLD FINANCE CORPORATION

                                        By:
                                            ----------------------------------

Attest:

                                                  (Corporate Seal)
----------------------------------
        Assistant Secretary

                                        THE CHASE MANHATTAN BANK

                                        By:
                                            ----------------------------------

Attest:

----------------------------------                (Corporate Seal)

                                      -8-<PAGE>   1
                                                                   EXHIBIT 10.26

NABI
--------------------------------------------------------------------------------
                                           5800 PARK OF COMMERCE BOULEVARD, N.W.
                                                            BOCA RATON, FL 33487

                         EFFECTIVE AS OF MARCH 10, 2000

Robert B. Naso, Ph.D.
8630 Lochaven Drive
Gaithersburg, MD 20882

Dear Bob:

         The Board of Directors of Nabi (the "Corporation") and the Compensation
Committee (the "Committee") of the Board have determined that it is in the best
interests of the Corporation and its shareholders for the Corporation to agree,
as provided herein, to pay you termination compensation in the event you should
leave the employ of the Corporation under the circumstances described below.

         The Board and the Committee recognize that the continuing possibility
of a sale or change of control of the Corporation is unsettling to you and other
key employees of the Corporation. Therefore, these arrangements are being made
to help assure a continuing dedication by you to your duties to the Corporation
by diminishing the inevitable distraction to you from the personal uncertainties
and risks created by a pending sale or change of control of the Corporation. In
particular, the Board and the Committee believe it important, should the
Corporation receive proposals from third parties with respect to its future, to
enable you, without being influenced by the uncertainties of your own situation,
to assess and advise the Board whether such proposals would be in the best
interests of the Corporation and its shareholders and to take such other action
regarding such proposals as the Board might determine to be appropriate,
including being available to assist in any transition should there be a sale or
change of control of the Corporation. The Board and the Committee also wish to
demonstrate to executives of the Corporation that the Corporation is concerned
with the welfare of its executives and intends to see that loyal executives are
treated fairly.

         1. In view of the foregoing and in further consideration of your
continued employment with the Corporation, the Corporation will pay you as
termination compensation a lump sum amount, determined as provided below, in the
event that (a) within six months after a Change of Control of the Corporation
you terminate your employment with the Corporation for Good Reason, (b) within
twelve months after a Change of Control of the Corporation your employment with
the Corporation is terminated by the Corporation for any reason, or (c) within
the period beginning on the sixth monthly anniversary of a Change of Control of
the Corporation and ending on the twelfth monthly anniversary thereof, you
terminate your employment with the Corporation for any reason (including,
without limitation, death or disability). The lump sum compensation so payable
(hereinafter referred to as the "Lump Sum Amount") shall be an amount equal to
one and one-half times the sum of (a) the higher of (i) your current annual base
salary or (ii) your base salary immediately prior to the Change of Control plus
(b) your average Bonuses for the three most recently-ended fiscal years prior to
the Change of Control. The Lump Sum Amount shall be paid to you within five days
after the date of termination of your employment (hereinafter referred to as the
"Termination Date").

         2. In addition, in the event your employment with the Corporation
terminates under circumstances entitling you to receive the Lump Sum Amount:

                  (a) Any compensation and other amounts previously deferred by
         you, together with accrued interest thereon, if any, to which you are

<PAGE>   2

         entitled, and any accrued vacation pay and accrued paid leave bank
         amounts not yet paid by the Corporation, shall be paid to you within
         five days of such termination.

                  (b) All other amounts accrued or earned by you through the
         date of such termination and amounts otherwise owing under the
         Corporation's plans and policies shall be paid to you within five days
         of such termination.

                  (c) The Corporation shall maintain in full force and effect,
         for the continued benefit of you and/or your family for eighteen months
         after the Termination Date, all employee welfare benefit plans and any
         other employee benefit programs or arrangements (including, without
         limitation, medical and dental insurance plans, disability and life
         insurance plans and car allowance programs) in which you were entitled
         to participate immediately prior to the Change of Control, provided
         that your continued participation is possible under the general terms
         and provisions of such plans and programs. In the event that your
         participation in any such plan or program is barred, the Corporation
         shall arrange to provide you with benefits substantially similar to
         those which you are entitled to receive under such plans and programs.

                  (d) All outstanding stock options which you hold shall vest
         immediately upon a Change of Control and shall be exercisable for (i)
         the remainder of the option term(s) or (ii) a period of five years from
         the Termination Date, whichever is shorter.

                  (e) The Corporation shall pay up to $25,000 for outplacement
         services provided to you by an organization selected by you.

                  (f) You shall not be required to mitigate the amount of any
         payment provided for in this Agreement by seeking other employment or
         otherwise, nor shall the amount of any payment provided for in this
         Agreement be reduced by any compensation earned by you as the result of
         employment by another employer after the Termination Date, or
         otherwise. The Corporation's obligation to make the payments provided
         for in this Agreement and otherwise to perform its obligations
         hereunder shall not be affected by any set-off, counterclaim,
         recoupment, defense or other claim, right or action which it may have
         against you or others.

         3. Any termination by you for Good Reason shall be communicated by a
written notice given within 120 days of your having actual notice of the events
giving rise to a right to terminate for Good Reason and which (i) sets forth in
reasonable detail the facts and circumstances claimed to provide a basis for
termination for Good Reason and (ii), if the Termination Date is other than the
date of receipt of such notice, specifies the Termination Date (which date shall
not be more than 15 days after the giving of such notice). Your failure to set
forth in the notice of termination any fact or circumstance which contributes to
a showing of Good Reason shall not waive any right of yours hereunder or
preclude you from asserting such fact or circumstance in enforcing your rights
hereunder.

         4. For purposes of this Agreement:

                  (a) "Bonus" means bonus or incentive compensation paid or
         payable by the Corporation to you pursuant to plans which the
         Corporation now maintains or has maintained including, but not limited
         to, signing bonuses. If your Bonus for a fiscal year has been pro rated
         because you were not employed by the Corporation for the entire fiscal
         year, the pro ration shall be ignored and you shall be deemed to have
         received the entire Bonus for the year.

                  (b) "Exchange Act" means the Securities Exchange Act of 1934,
         as amended.

                  (c) A "Change of Control" shall be deemed to have taken place
         if (i) any "person" (as such term is used in Sections 13(d) and
         14(d)(2) of the Exchange Act) is or becomes the beneficial owner
         (within the meaning of Rule 13d-3 promulgated under the Exchange Act),
         directly or indirectly, of securities of the Corporation representing
         25% or more of the combined voting power of the Corporation's then
         outstanding securities; (ii) the shareholders of the Corporation shall
         have approved (A) a reorganization, merger or consolidation, in each
         case, with respect to which persons who were shareholders of the
         Corporation immediately prior to such reorganization, merger or
         consolidation do not, immediately thereafter, own more than 50% of the

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<PAGE>   3

         combined voting power entitled to vote generally in the election of
         directors of the reorganized, merged or consolidated company's then
         outstanding voting securities or (B) a liquidation or dissolution of
         the Corporation; or (iii) as the result of a tender offer, exchange
         offer, merger, consolidation, sale of assets or contested solicitation
         of proxies or any combination of the foregoing transactions (a
         "Transaction"), the persons who were directors of the Corporation
         immediately before the Transaction shall cease to constitute a majority
         of the Board of Directors of the Corporation or of any parent of or
         successor to the Corporation immediately after the Transaction occurs.

                  (d) "Good Reason" means:

                           (i) The assignment to you of any duties inconsistent
                  in any material adverse respect with your position (including
                  status, offices, titles and reporting requirements),
                  authority, duties or responsibilities as in effect on the date
                  of the Change of Control, or any other action by the
                  Corporation which results in a diminution in such position,
                  authority, duties or responsibilities, excluding for this
                  purpose an isolated, insubstantial and inadvertent action not
                  taken in bad faith and which is remedied by the Corporation
                  promptly after receipt of notice from you;

                           (ii) Any reduction of your base salary or the failure
                  by the Corporation to provide you with an incentive
                  compensation program, welfare benefits, retirement benefits
                  and other benefits which in the aggregate are no less
                  favorable than the benefits to which you were entitled prior
                  to the Change of Control;

                           (iii) The Corporation's requiring you to be based at
                  any office or location more than 15 miles from that location
                  at which you are employed on the date of the Change of
                  Control, except for travel reasonably required in the
                  performance of your responsibilities;

                           (iv) Any action taken or suffered by the Corporation
                  as of or following the Change of Control (such as, without
                  limitation, transfer or encumbrance of assets or incurring of
                  indebtedness) which materially impairs the ability of the
                  Corporation to make any payments due or which may become due
                  to you under this Agreement; or

                           (v) any failure by the Corporation to obtain the
                  assumption and agreement to perform this Agreement by a
                  successor as contemplated by Section 10.

         5. (a) Anything in this Agreement to the contrary notwithstanding, in
the event it shall be determined that any payment or distribution by the
Corporation to you or for your benefit, whether paid or payable or distributed
or distributable pursuant to the terms of this Agreement or otherwise (a
"Payment"), would be subject to the excise tax imposed by Section 4999 of the
Internal Revenue Code of 1986, as amended (the "Code") or any interest or
penalties with respect to such excise tax (such excise tax, together with any
such interest and penalties, are hereinafter collectively referred to as the
"Excise Tax"), then you shall be entitled to receive an additional payment (a
"Gross-Up Payment") in an amount such that after payment by you of all taxes
(including any interest or penalties imposed with respect to such taxes),
including any Excise Tax, imposed upon the Gross-Up Payment, you retain an
amount of the Gross-Up Payment equal to the Excise Tax imposed upon the
Payments.

         (b) Subject to the provisions of Section 5(c), all determinations
required to be made under this Section 5, including whether a Gross-Up Payment
is required and the amount of such Gross-Up Payment, shall be made by Ernst &
Young (the "Accounting Firm") which shall provide detailed supporting
calculations both to the Corporation and you within 15 business days of the date
your employment with the Corporation terminates, or such earlier time as is
requested by the Corporation. If the Accounting Firm determines that no Excise

                                       3
<PAGE>   4

Tax is payable to you, it shall furnish you with an opinion that you have
substantial authority not to report any Excise Tax on your federal income tax
return. Any determination by the Accounting Firm shall be binding upon the
Corporation and you. As a result of the uncertainty in the application of
Section 4999 of the Code at the time of the initial determination by the
Accounting Firm hereunder, it is possible that Gross-Up Payments which will not
have been made by the Corporation should have been made ("Underpayment"),
consistent with the calculations required to be made hereunder. In the event
that the Corporation exhausts its remedies pursuant to Section 5(c) and you
thereafter are required to make a payment of any Excise Tax, the Accounting Firm
shall determine the amount of the Underpayment that has occurred and any such
Underpayment shall be promptly paid by the Corporation to you or for your
benefit.

         (c) You shall notify the Corporation in writing of any claim by the
Internal Revenue Service that, if successful, would require the payment by the
Corporation of the Gross-Up Payment. Such notification shall be given as soon as
practicable but no later than ten business days after you know of such claim and
shall apprise the Corporation of the nature of such claim and the date on which
such claim is requested to be paid. You shall not pay such claim prior to the
expiration of the thirty-day period following the date on which you give such
notice to the Corporation (or such shorter period ending on the date that any
payment of taxes with respect to such claim is due). If the Corporation notifies
you in writing prior to the expiration of such period that it desires to contest
such claim, you shall:

                  (i) give the Corporation any information reasonably requested
         by the Corporation relating to such a claim,

                  (ii) take such action in connection with contesting such claim
         as the Corporation shall reasonably request in writing from time to
         time, including, without limitation, accepting legal representation
         with regard to such claim by an attorney reasonably selected by the
         Corporation,

                  (iii) cooperate with the Corporation in good faith in order
         effectively to contest such claim, and

                  (iv) permit the Corporation to participate in any proceedings
         relating to such claim;

provided, however, that the Corporation shall bear and pay directly all costs
and expenses (including additional interest and penalties) incurred in
connection with such contest and shall indemnify and hold you harmless, on an
after-tax basis, for an Excise Tax or income tax, including interest and
penalties with respect thereto, imposed as a result of such representation and
payment of costs and expenses. Without limitation of the foregoing provisions of
this Section 5(c), the Corporation shall control all proceedings taken in
connection with such contest and, at its sole option, may pursue or forgo any
and all administrative appeals, proceedings, hearings and conferences with the
taxing authority in respect of such claim and may, at its sole option, either
direct you to pay the tax claimed and sue for a refund or contest the claim in
any permissible manner, and you agree to prosecute such contest to a
determination before any administrative tribunal, in a court of initial
jurisdiction and in one or more appellate courts, as the Corporation shall
determine; provided, however, that if the Corporation directs you to pay such
claim and sue for a refund, the Corporation shall advance the amount of such
payment to you, on an interest-free basis and shall indemnify and hold you
harmless, on an after-tax basis, from any Excise Tax or income tax, including
interest or penalties with respect thereto, imposed with respect to such advance
or with respect to any imputed income with respect to such advance; and further
provided that any extension of the statute of limitations related to payment of
taxes for your taxable year with respect to which such contested amount is
claimed to be due is limited solely to such contested amount. Furthermore, the
Corporation's control of the contest shall be limited to issues with respect to
which a Gross-Up Payment would be payable hereunder and you shall be entitled to
settle or contest, as the case may be, any other issue raised by the Internal
Revenue Service or any other taxing authority.

         (d) If, after the receipt by you of an amount advanced by the
Corporation pursuant to Section 5(c), you become entitled to receive any refund
with respect to such claim, you shall (subject to the Corporation's complying
with the requirements of Section 5(c)) promptly pay to the Corporation the

                                       4
<PAGE>   5

amount of such refund (together with any interest paid or credited thereon after
taxes applicable thereto). If, after the receipt by you of an amount advanced by
the Corporation pursuant to Section 5(c), a determination is made that you shall
not be entitled to any refund with respect to such claim and the Corporation
does not notify you in writing of its intent to contest such denial of refund
prior to the expiration of thirty days after such determination, then such
advance shall be forgiven and shall not be required to be repaid and the amount
of such advance shall offset, to the extent thereof, the amount of Gross-Up
Payment required to be paid.

         6. Anything in this Agreement to the contrary notwithstanding, if your
employment with the Corporation is terminated prior to the date on which a
Change of Control occurs, and it is reasonably demonstrated by you that such
termination (a) was at the request of a third party who has taken steps
reasonably calculated to effect a Change of Control or (b) otherwise arose in
connection with or in anticipation of a Change of Control, then for all purposes
of this Agreement, a Change of Control shall be deemed to have occurred the date
immediately prior to the date of such termination.

         7. This Agreement shall be binding upon and inure to the benefit of
you, your estate and the Corporation and any successor or assign of the
Corporation, but neither this Agreement nor any rights arising hereunder may be
assigned or pledged by you. If you should die while any amount would still be
payable to you hereunder if you had continued to live, all such amounts, unless
otherwise provided herein, shall be paid in accordance with the terms of this
Agreement to your devisee, legatee, or other designee or, if there by no such
designee, to your estate.

         8. For purposes of this Agreement, notices and all other communications
provided for in the Agreement shall be in writing and shall be deemed to have
been duly given when delivered or mailed by United States registered mail,
return receipt requested, postage prepaid, addressed, in your case, to the
address set forth on the first page of this Agreement and, in the Corporation's
case, to the address of its principal office (all notices to the Corporation to
be directed to the attention of the President of the Corporation with a copy to
the Secretary of the Corporation) or to such other address as either party may
have furnished to the other in writing in accordance herewith, except that
notices of change of address shall be effective only upon receipt.

         9. No provisions of this Agreement may be modified, waived or
discharged unless such waiver, modification or discharge is agreed to in writing
signed by you and such officer as may be specifically designated by the Board of
Directors of the Corporation. No waiver by either party hereto at any time of
any breach by the other party hereto of, or compliance with, any condition or
provision of this Agreement to be performed by such other party shall be deemed
a waiver of similar or dissimilar provisions or conditions at the time or at any
prior or subsequent time. No agreements or representations, oral or otherwise,
express or implied, with respect to the subject matter hereof have been made by
either party which are not set forth expressly in this Agreement. The validity,
interpretation, construction and performance of this Agreement shall be governed
by the laws of the State of Florida without regard to principles of conflicts of
laws.

         10. The Corporation will require any successor (whether direct or
indirect, by purchase, merger, consolidation or otherwise) to all or
substantially all of the business and/or assets of the Corporation to expressly
assume and agree to perform this Agreement in the same manner and to the same
extent that the Corporation would be required to perform it if no such
succession had taken place. As used in this Agreement, "Corporation" shall mean
the Corporation as hereinbefore defined and any successor to its business and/or
assets as aforesaid which assumes and agrees to perform this Agreement by
operation of law, or otherwise.

         11. Nothing in this Agreement shall prevent or limit your continuing or
future participation in any benefit, bonus, incentive or other plan or program
provided by the Corporation and for which you may qualify, nor shall anything
herein limit or otherwise prejudice such rights as you may have under any other
agreements with the Corporation. Amounts which are vested benefits or which you
are otherwise entitled to receive under any plan or program of the Corporation
at or subsequent to any Change of Control shall be payable in accordance with

                                       5
<PAGE>   6

such plan or program. To the extent the terms of any other agreements you may
have with the Corporation are inconsistent with this Agreement, the terms of
this Agreement shall control.

         12. If you assert any claim in any contest (whether initiated by you or
by the Corporation) as to the validity, enforceability or interpretation of any
provision of this Agreement, the Corporation shall pay your legal expenses (or
cause such expenses to be paid), including, without limitation, your reasonable
attorneys' fees, on a quarterly basis, upon presentation of proof of such
expenses in a form reasonably acceptable to the Corporation, provided that you
shall reimburse the Corporation for such amounts, plus simple interest thereon
at the 90-day United States Treasury Bill rate as in effect from time to time,
compounded annually, if a court of competent jurisdiction shall find that you
did not have a good faith and reasonable basis to believe that you would prevail
as to at least one material issue presented to such court.

         13. The invalidity or unenforceability of any provisions of this
Agreement shall not affect the validity or enforceability of any other provision
of this Agreement, which shall remain in full force and effect.

         14. This Agreement may be executed in one or more counterparts, each of
which shall be deemed to be an original but all of which together will
constitute one and the same instrument.

         If you are in agreement with the foregoing, please so indicate by
signing and returning to the Corporation the enclosed copy of this letter,
whereupon this letter shall constitute a binding agreement under seal between
you and the Corporation.

                            Very truly yours,

                            NABI

                            Very truly yours,

                            By /s/ THOMAS H. MCLAIN
                               ------------------------------------------
                                 Name:  Thomas H. McLain
                                 Title:  Sr. VP Corporate Services and CFO

Agreed:

/s/ ROBERT B. NASO
----------------------
Name:  Robert B. Naso
Title:  Sr. VP Quality, Regulatory and Product Development

                                       6

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