THIS AGREEMENT is made the 1st day of August, 1997 (the
          "Effective Date") by and between MUREX BIOTECH LIMITED a company
          incorporated in England and Wales (the "Company") and F MICHAEL P
          WARREN (the "Executive").

          WHEREAS, the Company and Executive previously entered into an
          Employment Agreement dated January 1, 1992; and

          WHEREAS, the term of the employment relationship created by such
          Employment Agreement has not expired; and

          WHEREAS, the Company and Executive desire to amend and restate
          the terms and conditions of their employment relationship as it
          relates to the period subsequent to 1 August, 1997.

          NOW THEREFORE, in consideration of the foregoing and the mutual
          agreements contained herein, the Company and Executive agree as
          follows:-

          1.     Employment
                 ----------

                 The Company hereby employs Executive, and Executive
                 accepts such employment and agrees to perform services for
                 the Company, for the period and upon the other terms and
                 conditions set forth in this Agreement.

          2.     Term
                 ----

                 The initial term of Executive's employment hereunder shall
                 be for a period of three (3) years, commencing as of 1
                 August 1997 (the "Commencement Date") subject to earlier
                 termination as hereinafter specified in Section 9.  At
                 each anniversary date of the Commencement Date (each a
                 "Renewal Date"), the then remaining term of this Agreement
                 shall be extended for an additional one year period in
                 addition to the then remaining term unless either party
                 hereto shall have provided written notice to the other
                 party of such non-renewal of this Agreement on or within
                 three (3) months before such Renewal Date.  In the event
                 that either party shall provide the other party with
                 written notice of non-renewal of this Agreement, this
                 Agreement shall not be extended as of any subsequent
                 Renewal Date but shall remain effective in accordance with
                 its terms (subject to termination in accordance with
                 Section 9 hereof) until the end of the then current term
                 of this Agreement.  A non-renewal of this Agreement in
                 accordance with this Section 2 shall not constitute a
                 termination of this Agreement for the purpose of Sections
                 6 or 9.

          3.     Position and Duties
                 ------------------- 

          3.1    Service with the Company
                 ------------------------

                 During the term of this Agreement, Executive shall serve
                 in such position as Executive and the Board of Directors
                 shall from time to time agree.  In such position,
                 Executive agrees to perform such executive employment
                 duties consistent with such positions as the Board of
                 Directors of the Company shall assign to him from time to
                 time.  Executive also agrees to serve, during the Term
                 hereof, as requested by the Board, and without any
                 additional compensation, as a Director of the Company and
                 as an executive officer and/or director of any
                 corporations affiliated with the Company.  The
                 compensation payable to Executive herein shall be paid by
                 the Company or by a subsidiary, holding company or
                 subsidiary of such holding company of the Company as
                 designated by Executive.

          3.2    Performance of Duties
                 ---------------------

          3.2.1  Executive agrees to serve the Company faithfully and to
                 the best of his ability and to devote the time, attention
                 and efforts necessary to advance the business and affairs
                 of the Company during the Term of this Agreement.  It is
                 understood and agreed that Executive may pursue personal
                 investments requiring time commitments that do not
                 conflict with his obligations to the Company, including
                 those in the preceding sentence.  Executive hereby
                 confirms that he is under no contractual commitments
                 inconsistent with his obligations set forth in this
                 Agreement, and that during the Term of this Agreement, he
                 shall not render or perform services, or enter into any
                 contract to do so, for any other corporation, firm, entity
                 or person which are inconsistent with the provisions of
                 this Agreement.

          3.2.2  All duties performed by Executive hereunder (other than
                 incidental duties) shall be performed at such locations in
                 the United Kingdom as the Board of Directors of the
                 Company may from time to time direct.

          4.     Compensation
                 ------------

          4.1    Base Salary
                 -----------

                 As compensation for all services to be rendered by
                 Executive under this Agreement, the Company shall pay to
                 Executive an initial base annual salary (the "Base
                 Salary") of US$107,206  which salary shall be paid in
                 semi-monthly instalments in accordance with the Company's
                 normal payroll procedures and policies.  The base salary
                 shall be increased on January 1, 1998 and on each January
                 1 thereafter by the percentage equal to the percentage
                 increase in the Consumer Price Index maintained by the
                 United States Bureau of Labour Statistics for the Atlanta,
                 Georgia metropolitan area or an equivalent index (the
                 "Index") as of January 1 of such year over the Index for
                 the immediately preceding January 1. Should the Index be
                 modified or discontinued, appropriate adjustment shall be
                 made to reflect such modification or to refer to a similar
                 index.  Additionally, Executive's Base Salary shall be
                 reviewed annually and may be increased by an amount to be
                 determined by the Compensation/Option Committee (the
                 "Committee") on the basis of Executive's performance.

          4.2    Incentive Compensation
                 ----------------------

                 In addition to the Base Salary described in Section 4.1,
                 Executive shall be eligible to receive incentive
                 compensation pursuant to the Senior Management Incentive
                 Plan as approved by the Committee or such other plans as
                 may from time to time be available.

          4.3    Deferral of Compensation
                 ------------------------

                 Executive shall be entitled to elect to defer the receipt
                 of up to seventy-five percent (75%) of his Base Salary and
                 Incentive Compensation for each calendar year during which
                 this Agreement is in effect. Executive shall make the
                 election to defer his compensation for a calendar year by
                 giving written notice to the Company of his desire to do
                 so in writing no later than December 31 of the immediately
                 preceding calendar year.  In the event that Executive
                 elects to defer the payment of any compensation due
                 hereunder in the manner contemplated by this Section 4.3,
                 the terms and conditions set forth in Exhibit A hereto
                 with respect to the circumstances under which Executive
                 shall be entitled to the payment of the deferred
                 compensation as well as the interest earned thereon and
                 the timing and method of those payments shall be
                 applicable.  Also in such event, each of the periodic
                 payments of Executive's Base Salary for any year in which
                 Executive has elected to defer receipt of a portion of his
                 Base Salary shall be reduced by the percentage amount of
                 his total Base Salary which he has elected to defer.

          4.4    Participation in Benefit Plans
                 ------------------------------

                 Executive shall also be entitled, to the extent that his
                 position, title, tenure, salary, and other qualifications
                 make him eligible, to participate in all employee benefit
                 plans or programs (including medical/dental and life
                 insurance, retirement pension, and stock option incentives
                 relating to stock in International Murex Technologies
                 Corporation) of the Company currently in existence on the
                 date hereof or as my hereafter be instituted from time to
                 time. Executives participation in any such plan or program
                 shall be subject to the provisions, rules and regulations
                 applicable thereto.

          4.5    Expenses
                 --------

                 In accordance with the Company's policies established from
                 time to time, the Company shall pay or reimburse Executive
                 for all reasonable and necessary out-of-pocket expenses
                 incurred by him in the performance of his duties under
                 this Agreement, subject to the timely presentment of
                 appropriate vouchers and receipts.

          4.6    Car Allowance
                 -------------

                 The Company shall provide Executive with a car or pay a
                 car allowance in amount recommended by the Executive
                 Committee and approved by the Committee.

          4.7    Accommodation
                 -------------

                 During the term of this Agreement and whilst Executive
                 continues to reside in the United Kingdom the Company
                 shall provide accommodation for Executive in the United
                 Kingdom of a type commensurate with the status and needs
                 of Executive and the image of the Company and its
                 associates.  The accommodation shall be provided on terms
                 to be recommended by the Executive Committee of the
                 Company and agreed in writing between the Committee and
                 Executive.

          4.8    Club and Professional Dues
                 --------------------------

                 During the term of this Agreement, Executive will be
                 entitled to reimbursement of club/professional society
                 membership dues and monthly charges and an annual physical
                 examination by the physician of Executive's choice. 
                 Amounts paid for club/professional society membership dues
                 and monthly charges shall not exceed US$5,000 annually. 
                 In the event that Executive is required to pay any tax on
                 such reimbursement, the amount to be reimbursed to
                 Executive shall be grossed up by such amount as shall
                 ensure that Executive receives the same amount as he would
                 have received had not such tax been payable.


          4.9    Double Tax Liability
                 --------------------

                 In the event that in any year during the term of this
                 Agreement Executive is required to pay income taxes on any
                 portion of his income for that year both to Canada and to
                 the United Kingdom, the Company shall pay to Executive the
                 amount which, after taking into account the taxes required
                 to be paid by Executive as a result of Executive's receipt
                 of such payment from the Company, shall cause Executive's
                 after-tax return on his income to equal the amount which
                 would have been available to Executive had no United
                 Kingdom taxes been due with respect to such income.  The
                 amounts due from the Company pursuant to the immediately
                 preceding sentence shall be determined by Executive's tax
                 return preparer, shall take into account any foreign tax
                 credits or other credits and deductions allowed against
                 his Canadian tax liability, and shall be paid to Executive
                 no later than fifteen (15) days following the date on
                 which Executive files the first tax return in which the
                 income subject to taxation in both Canada and the United
                 Kingdom is reported in any year or within fifteen (15)
                 days following the date on which the relevant taxing
                 authority determines that Executive's income is subject to
                 taxation both in Canada and in the United Kingdom, as the
                 case may be.

          4.10   Additional Benefits
                 -------------------

                 During the term of this Agreement, Executive shall be
                 entitled to participate in all present and future employee
                 benefit plans and all other compensation and benefit
                 plans, programs and structures as may from time to time be
                 made available by the Company to all other key corporate
                 executives of the Company, and on terms and conditions no
                 less favourable than those generally available to other
                 such employees.  In the event that the Company elects to
                 obtain key man life insurance insuring Executive,
                 Executive shall make himself available for the necessary
                 physical examinations and shall cooperate in all other
                 respects with the Company's efforts to obtain such
                 insurance.

          5.     Sickness
                 --------

          5.1    If Executive is absent because of sickness or injury he
                 shall report this fact forthwith to the Company and if
                 Executive is so prevented for seven or more consecutive
                 days he should provide a medical practitioners statement
                 on the eighth day and weekly thereafter so that the whole
                 period of absence is certified by such statement.
                 Immediately following his return to work after a period of
                 absence Executive shall complete a self certification form
                 available from the Company detailing the reason for his
                 absence.

          5.2    If Executive shall be absent due to sickness or injury
                 duly certified in accordance with the provisions of
                 Section 5.1, he shall be paid his full compensation
                 (including incentive compensation) for up to twelve (12)
                 weeks absence in any period of twelve consecutive months
                 and thereafter such remuneration, if any, as the board of
                 directors of the Company shall determine from time to time
                 provided that such compensation shall be inclusive of any
                 Statutory Sick Pay to which Executive is entitled under
                 the provisions of the Social Security and Housing Benefits
                 Act 1982 and any social security sickness benefit or other
                 benefit recoverable by Executive (whether or not
                 recovered) may be deducted therefrom.

          6.     Compensation upon Termination
                 -----------------------------

          6.1    In the event this Agreement is terminated pursuant to sub-
                 section 9.1(a) hereof, in addition to any benefits to
                 which Executive may then or following the termination of
                 his employment be entitled under any other applicable
                 policy or plan of the Company then the Company shall pay
                 to Executive's estate his Base Salary, incentive
                 compensation and benefits due through the effective date
                 of termination.  In the event that such termination occurs
                 on any date other than the last day of the fiscal year,
                 the incentive compensation shall be based upon the
                 performance goals achieved at the end of the fiscal year,
                 but shall be prorated based upon the number of days which
                 have elapsed in the fiscal year through the date of
                 termination.  Payment of this incentive compensation or
                 release of any stock representing incentive compensation
                 due under this Section 6.1 shall be made no later than 120
                 days following the end of the fiscal year with respect to
                 which it is being paid. Payment of all other amounts under
                 this Section 6.1 shall be made not later than the 30th day
                 following the effective date of termination. Executive's
                 estate shall be entitled to receive an amount equal to
                 twenty-four (24) times his then current monthly Base
                 Salary.

          6.2    In the event this Agreement is terminated pursuant to sub-
                 section 9.1(b)(i) hereof, Executive or his representative
                 shall be entitled to receive an amount equal to twenty
                 four (24) times his then current monthly Base Salary, less
                 any disability insurance benefits payable to Executive
                 during such twenty-four month period from disability
                 policies provided by the Company.

          6.3    In the event this Agreement is terminated pursuant to sub-
                 section 9.1(b)(ii) or (iii) hereof, Executive shall not be
                 entitled to any compensation other than his then current
                 Base Salary which has accrued through his date of
                 termination, subject to the Company's right of offset
                 based upon acts of Executive which gave rise to the
                 termination.

          6.4    In the event that Executive is terminated pursuant to sub-
                 section 9.1(c) hereof, Executive shall be entitled to a
                 severance allowance equal to the greater of (i) his Base
                 Salary for all months remaining in his then current term,
                 or (ii) his then current monthly Base Salary for twenty
                 four (24) months.

          6.5    Subject to Section 6.1, payments or the release of stock
                 representing compensation to Executive pursuant to this
                 Section 6 shall be made in either a lump sum payment or,
                 at the sole discretion of the Company in four (4) equal
                 payments within six (6) months of termination of this
                 Agreement.

          6.6    In the event that Executive is terminated pursuant to sub-
                 sections 9.1(a), 9.1(b)(i) or 9.1(c) hereof, the
                 expiration dates of Executive's options currently
                 outstanding pursuant to any of the Company's stock option
                 plans will be extended twenty four (24) months from the
                 date of such termination or such lesser period as may be
                 permitted by law or under the terms of the relevant plan.

          7.     Confidential Information
                 ------------------------

                 Except as permitted or directed by the Company's Board of
                 Directors, Executive shall not during the Term of this
                 Agreement or at any time thereafter divulge, furnish or
                 make accessible to anyone for use in any way (other than
                 in the ordinary course of the business of the Company) any
                 confidential or secret knowledge or information of the
                 Company (for the purposes of Sections 7 through 10 hereof,
                 the term "Company" shall be deemed to include any
                 subsidiary or affiliate of the Company) which Executive
                 has acquired or become acquainted with or will acquire or
                 become acquainted with prior to the termination of the
                 period of his employment by the Company, whether developed
                 by himself or by others, concerning any trade secrets,
                 confidential or secret designs, processes, formulae, plans
                 devices or material (whether or not patented or
                 patentable) directly or indirectly useful in any aspect of
                 the business of the Company, and confidential customer or
                 supplier lists of the Company, any confidential or secret
                 development or research work of the Company, or any other
                 confidential or secret aspects of the business of the
                 Company. Executive acknowledges that the above described
                 knowledge or information constitutes a unique and valuable
                 asset of the Company acquired at great time and expense by
                 the Company and its predecessors, and that any disclosure
                 or other use of such knowledge or information other than
                 for the sole benefit of the Company would be wrongful and
                 would cause irreparable harm to the Company.  Both during
                 and after the Term of this Agreement, Executive shall
                 refrain from any acts or omissions that would reduce the
                 value of the use of such knowledge or information to the
                 Company.  The foregoing obligations of confidentiality,
                 however, shall not apply to any knowledge or information
                 which is now published or which subsequently becomes
                 generally publicly known, other than as a direct or
                 indirect result of the breach of this Agreement by
                 Executive.

          8.     Non-Competition, Solicitation of Customers, Solicitation
                 --------------------------------------------------------
                 of Employees 
                 -------------

          8.1    Non-Competition
                 ---------------

                 (a)    Executive agrees that, during the period of his
                        employment hereunder and for a period of one (1)
                        year following the termination of such employment,
                        he shall not directly engage in competition with
                        the Company within the "Territory" (as hereinafter
                        defined) in any management capacity in any phase of
                        the Company's business of developing,
                        manufacturing, distributing, marketing, leasing or
                        selling any of the products which the Company is in
                        the business of developing, manufacturing,
                        distributing, marketing, leasing to others or
                        selling (the "Competitive Areas") during the Term
                        of this Agreement or which the Company has
                        definitive plans to develop, manufacture or market.

                 (b)    The "Territory" shall be that area throughout the
                        world in which the Company presently markets its
                        products.  This Agreement shall be deemed
                        automatically amended without the need of further
                        action by any party to add any new countries or
                        parts thereof where after the date hereof and prior
                        to the termination of Executive's employment the
                        Company begins to market its products and to delete
                        any countries after no Company products have been
                        sold there for a period of six months.

                 (c)    The restrictions in this Section 8 shall not apply
                        with respect to (i) a passive investment by
                        Executive of less than 5% of the outstanding shares
                        of capital stock of any corporation, or (ii)
                        employment by Executive with an entity in a
                        management capacity in an area of business which is
                        not, directly or indirectly, a Competitive Area.

          8.2    Agreement not to Solicit Customers
                 ----------------------------------

                 Executive agrees that during his employment by the Company
                 hereunder and for the two (2) year period following the
                 termination of such employment, he shall not, without the
                 prior written consent of the Company, within the
                 Territory, either directly or indirectly, on his own
                 behalf or in the service or on behalf of others, solicit,
                 divert or appropriate, or attempt to solicit, divert or
                 appropriate, to any competing business any person or
                 entity whose account with the Company was sold or serviced
                 by or under the supervision of Executive during the year
                 preceding the termination of such employment.

          8.3    Agreement not to Solicit Employees
                 ----------------------------------

                 Executive agrees that during his employment by the Company
                 hereunder and for the two (2) year period following the
                 termination of such employment, he shall not, either
                 directly or indirectly, on his own behalf or in the
                 service or on behalf of others, solicit, divert, or
                 attempt to solicit or divert any person then employed by
                 the Company.

          9.     Termination
                 -----------

          9.1    Grounds for Termination
                 -----------------------

                 This Agreement shall terminate prior to the expiration of
                 the Initial Term set forth in Section 2 or any extension
                 thereof in the event that at any time during such Initial
                 Term or any extension thereof:

                 (a)    Executive shall die; or

                 (b)    The Board of Directors of the Company shall
                        determine that:

                        (i)    Executive has become disabled; or
                        (ii)   Executive has breached this Agreement in any
                               material respect, which breach is not cured
                               by Executive or is not capable of being
                               cured (as determined in the sole discretion
                               or the Company's Board of Directors) by
                               Executive within thirty (30) days after
                               written notice of such breach is delivered
                               to Executive; or 

                        (iii)  In its sole discretion cause exists. 
                               "Cause" means (A) conduct amounting to
                               fraud, embezzlement or misappropriation as
                               against the Company, (B) the wilful and
                               knowing material breach of any fiduciary
                               duty owed to the Company as an officer of
                               the Company other than done at the direction
                               of the Board of Directors, (C) having been
                               convicted of a criminal offence which may
                               have a material adverse effect on the
                               Company or the ability of Executive to carry
                               out his duties of employment, or (D) the
                               knowing failure of Executive to follow
                               specific directives of the Board of
                               Directors of the Company consistent with his
                               duties.  If the Board of Directors
                               terminates this Agreement pursuant to this
                               Section 9.1(b)(iii), Executive will be
                               provided ninety (90) days written notice.

                 (c)    The Board of Directors of the Company shall
                        determine, in its sole discretion, that the
                        termination of this Agreement is in the best
                        interest of the Company, and in which event
                        Executive shall have no duty to mitigate his
                        damages.  If the Board of Directors terminates this
                        Agreement pursuant to this Section 9.1(c),
                        Executive will be provided ninety (90) days written
                        notice.

                 (d)    Notwithstanding any termination of this Agreement,
                        Executive, in consideration of his employment
                        hereunder to the date of such termination, shall
                        remain bound by the provisions of this Agreement
                        which specifically relate to periods, activities or
                        obligations upon or subsequent to the termination
                        of Executive's employment.

          9.2    "Disability" Defined
                 --------------------

                 The Board of Directors may determine that Executive has
                 become disabled, for the purpose of this Agreement, in the
                 event that Executive shall fail, because of illness or
                 other physical or mental incapacity, to render services of
                 the character contemplated by this Agreement for an
                 aggregate of more than twelve (12) weeks during any twelve
                 (12) month period.

          9.3    Surrender of Records and Property
                 ---------------------------------

                 Upon termination of his employment with the Company,
                 Executive shall deliver promptly to the Company all
                 records, manuals, books, blank forms, documents, letters,
                 memoranda, notes, notebooks, reports, data, tables,
                 calculations or copies thereof, which are the property of
                 the Company and which relate in any way to the business,
                 products, practices or techniques of the Company, and all
                 other property, trade secrets and confidential information
                 of the Company, including, but not limited to, all
                 documents which in whole or in part contain any trade
                 secrets or confidential information of the Company, which
                 in any of these cases are in his possession or under this
                 control.

          10.    Assignment and Enurement
                 ------------------------

                 This Agreement shall enure to the benefit of and be
                 binding upon the parties hereto and their respective
                 heirs, successors, administrators, and permitted assigns. 
                 The Company may, without the consent of Executive, assign
                 its rights and obligations under this Agreement to any
                 corporation, firm or other business entity with or into
                 which the Company may merge or consolidate, or to which
                 the Company may sell or transfer all or substantially all
                 of its assets or of which 50% or more of the equity
                 investment and of the voting control is owned, directly or
                 indirectly, by, or is under common ownership with, the
                 Company; provided, however, that if the assignee was not
                 previously part of a consolidated group with the Company,
                 Executive will receive payments and benefits as outlined
                 in Exhibit B attached hereto and incorporated herein.

          11.    Injunctive Relief
                 -----------------

                 Executive agrees that it would be difficult to compensate
                 the Company fully for damages for any violation of the
                 provisions of this Agreement, including without limitation
                 the provisions of Section 7, 8 and 9.3.  Accordingly,
                 Executive specifically agrees that the Company shall be
                 entitled to temporary and permanent injunctive relief to
                 enforce the provisions of this Agreement.  This provision
                 with respect to injunctive relief shall not, however,
                 diminish the right of the Company to claim and recover
                 damages in addition to injunctive relief.

          12.    Miscellaneous
                 -------------

          12.1   Governing Law
                 -------------

                 This Agreement is made under and shall be governed by and
                 construed in accordance with the laws of the Province of
                 Ontario subject to any principles of conflict of laws.


          12.2   Prior Agreements
                 ----------------

                 This Agreement contains the entire agreement of the
                 parties relating to the subject matter hereof and
                 supersedes all prior agreements and understandings with
                 respect to such subject matter, and the parties hereto
                 have made no agreements, representations or warranties
                 relating to the subject matter of this Agreement which are
                 not set forth herein.

          12.3   Amendments
                 ----------

                 No amendment or modification of this Agreement shall be
                 deemed effective unless made in writing signed by the
                 party against whom enforcement of the waiver or estoppel
                 is sought.  Any written waiver shall not be deemed a
                 continuing waiver unless specifically stated, shall
                 operate only as to the specific term or condition for the
                 future or as to any act other than that that specifically
                 waived.

          12.4   Notices
                 -------

                 Any notice, request, demand or other document to be given
                 hereunder shall be in writing, and shall be delivered
                 personally or sent by registered mail or facsimile
                 followed by mail as follows:

                        If to the Company:

                        Murex Biotech Limited
                        Central Road
                        Temple Hill
                        Dartford
                        Kent  DA1 5LR

                        If to Executive:

                        Flat 3
                        35-37 Grosvenor Square
                        London W1X 9AE

                 or to such other address as either party hereto may
                 hereinafter duly give to the other.


          12.5   Severability
                 ------------

                 To the extent any provision of this Agreement shall be
                 invalid or unenforceable, it shall be considered deleted
                 herefrom and the remainder of such provision and of this
                 Agreement shall be unaffected and shall continue in full
                 force and effect.  In furtherance and not in limitation of
                 the foregoing, should the duration or geographical extent
                 of, or business activities covered by any provision of
                 this Agreement be in excess of that which is valid or
                 enforceable under applicable law, then such provision
                 shall be construed to cover only that duration, extent or
                 activities which may validly and enforceably be covered. 
                 Executive acknowledges the uncertainty of the law in this
                 respect and expressly stipulates that this Agreement be
                 give the construction which renders its provisions valid
                 and enforceable to the maximum extent (not exceeding its
                 express terms) possible under applicable law.

          12.6   Withholding Taxes
                 -----------------

                 The Company may withhold from any benefits payable under
                 this Agreement all federal, state, city and other taxes as
                 shall be required pursuant to any law or governmental
                 regulation or ruling.

          IN WITNESS WHEREOF, the parties have executed this Agreement the
          day and year set forth above.



                                       SCHEDULE
                                       --------

                           Statement of Terms of Employment
                           --------------------------------


          1.     Amplification of Terms of Employment

          (a)    Name of Employer:    Murex Biotech Limited

          (b)    Address of Employer:  Central Road, Temple Hill, Dartford,
                 Kent DA1 5LR

          (c)    Name of Executive: Frederic Michael Patrick Warren

          (d)    Address of Executive: Flat 3, 35-37 Grosvenor Square,
                 London W1X 9AE

          (e)    Date of Commencement of Employment with the Company: 
                 January 1 1992

          (f)    Compensation: See Section 4

          (g)    Notice:  See Section 9

          (h)    Job Title:  See Section 3

          2.     In accordance with Section 1(3) of the Employment
                 Protection (Consolidation) Act 1978 the following terms of
                 the Executive's employment apply on the date of the
                 agreement to which this is a schedule:

          (a)    Hours of Work:  there are no fixed hours of work provided
                 that Executive shall be required to devote not less than
                 25 hours per week to the performance of his duties under
                 the Agreement.

          (b)    Holidays:  Executive is not entitled to any paid holidays
                 under the Agreement other than Bank Holidays

          (c)    Sickness or injury:  see Section 5 of the Agreement

          (d)    Other benefits:  see Section 4 of the Agreement

          3.     The following information is supplied pursuant to the
                 Employment Protection (Consolidation) Act 1978 (as may be
                 amended from time to time)

          (a)    Disciplinary Rules:  there are no formal disciplinary
                 procedures applicable to this employment;

          (b)    Grievance Procedure:  all grievances relating to the
                 employment under the agreement to which this is a schedule
                 should be reported to the board of directors of the
                 Company;

          (c)    A Contracting Out certificate is not in force in respect
                 of this employment.




          Signed by                   )
          VICTOR A RICE               )
          for and on behalf of        )
          MUREX BIOTECH               )
          LIMITED                     )
          in the presence of:-        )




          Signed by F MICHAEL P       )
          WARREN in the presence      )
          of:-                        )





                                      EXHIBIT A
                                      ---------

                              DEFERRED COMPENSATION PLAN
                              --------------------------

                 1.     At the time the Executive elects to defer
          compensation pursuant to Section 4.3 of the Employment Agreement,
          the Executive shall also elect the percentage of such
          compensation to be credited from the date of deferral to the date
          it is paid to the Executive with either (a) simple interest at a
          rate per annum equal to the average of the rates then being
          earned by the Company on deposits with a term of ninety days or
          less, adjusted on the first day of each calendar quarter or (b)
          the same rate of return experienced by the common stock of the
          Company.  The portion of the compensation deferred by the
          Executive to which the Executive elects to have the Company
          common stock rate of return apply shall be hypothetically
          invested in shares of the Company's common stock based on the
          closing price of the Company's common stock on the Nasdaq
          National Market System, or such other exchange that the Company's
          common stock may be listed at the time, on the business day prior
          to the date on which the compensation would otherwise be paid. 
          The number of shares of the Company's common stock in which the
          Executive has hypothetically invested shall be adjusted to
          reflect stock splits, stock dividends and other capital changes
          affecting the outstanding common stock of the Company in the same
          manner as an equivalent number of actual shares of the Company's
          common stock are adjusted.  In addition, all cash distributions
          and the fair market value (as determined in good faith by the
          Company) of any property distributions with respect to shares of
          common stock of the Company shall be reinvested in the common
          stock of the Company based on the closing price of the common
          stock as reported on the Nasdaq National Market System, or such
          other exchange that the Company's common stock may be listed at
          the time, on the business day prior to the distribution.  The
          portion of the Executive's compensation deferred hereunder and
          credited with simple interest, together with such simple
          interest, shall be referred to herein as "Deferred Compensation". 
          The portion of Executive's compensation deferred hereunder and
          credited with the rate of return of the common stock of the
          Company shall be reflected in hypothetical shares of the
          Company's common stock with each such share being referred to
          herein as a "Stock Credit".  On December 31st of each year during
          which any Deferred Compensation or Stock Credits remain unpaid,
          the Company shall provide the Executive with a statement setting
          forth the amount of his unpaid Deferred Compensation and the
          number of outstanding Stock Credits.

                 2.     The Deferred Compensation shall be paid to
          Executive in a lump sum following the termination of his
          employment with the Company for any reason on the 30th day
          following the date of termination.  The number of Stock Credits
          credited to the Executive shall be paid to the Executive on the
          30th date following the date of his termination, by the release
          of common stock to the Executive."

                 3.     Notwithstanding the foregoing, in the event of the
          occurrence of an "unforeseeable emergency," as hereinafter
          defined, Executive shall be entitled to a payment from the
          Deferred Compensation (or release of common stock representing
          Stock Credits) prior to the date set forth in paragraph 2 of this
          Exhibit A of that amount reasonably required to satisfy the
          emergency need.  As used herein, "unforeseeable emergency" shall
          be limited to (i) severe financial hardship to Executive
          resulting from a sudden and unexpected illness or accident of
          Executive or of a dependent of Executive, as dependent is defined
          in Section 152 of the Internal Revenue Code or any successor
          provision thereto, (ii) loss of Executive's property due to
          casualty, or (iii) other similar extraordinary and unforeseeable
          circumstances arising as a result of events beyond the control of
          Executive.  The circumstances that will constitute an
          unforeseeable emergency will depend upon the facts of each case,
          but, in any case, a payment (or release) of all or any portion of
          the Deferred Compensation in the event of an unforeseeable
          emergency may not be made to the extent that such hardship is or
          may be relieved;

                        (i)    Through reimbursement or compensation by
                 insurance or otherwise,

                        (ii)   By liquidation of Executive's assets, to the
                 extent the liquidation of such assets would not itself
                 cause severe financial hardship, or

                        (iii)  By cessation of the deferral of the payment
                 of the Deferred Compensation pursuant to paragraph 2,
                 above.

                 4.     The Company's obligation to pay the Deferred
          Compensation or release of common stock representing Stock
          Credits constitutes a mere promise by the Company to make these
          payments at the times specified herein.  Accordingly, Executive
          shall have the status of a general unsecured creditor with
          respect to the Deferred Compensation.  Executive's rights to the
          payment of Deferred Compensation or the release of common stock
          representing Stock Credits shall not be subject in any manner to
          anticipation, alienation, sale, transfer, assignment, pledge,
          encumbrance, attachment, or garnishment by creditors of Executive
          or his estate or any beneficiary of either Executive or his
          estate.