<PAGE>   1
                                                                   EXHIBIT 10.14

*CERTAIN INFORMATION WITHIN THIS EXHIBIT HAS BEEN OMITTED AND THE NON-PUBLIC
INFORMATION HAS BEEN FILED SEPARATELY WITH THE SEC. CONFIDENTIAL TREATMENT HAS
BEEN REQUESTED WITH RESPECT TO THE OMITTED PORTIONS.


LICENSE AND SUPPLY AGREEMENT entered into as of the 4th day of February 2000.



BETWEEN:   ARIDIA CORP., a corporation incorporated under the laws of the
           Province of Nova Scotia (hereinafter the "Corporation")




AND:       CEPHEID, a corporation incorporated under the laws of the state of
           California (hereinafter "Cepheid")



WHEREAS, Cepheid has expertise and know-how relating to systems, subsystems and
consumables (such as disposable reaction tube), for diagnosing human disease
parameters;

WHEREAS Infectio Diagnostic (I.D.I.) Inc. ("IDI") has granted to the Corporation
an exclusive license to make, use, offer to sell and sell certain nucleic acid
sequences in combination with Cepheid proprietary technology for identification
and diagnosis of certain human infectious disease parameters;

WHEREAS, Cepheid and the Corporation desire to enter into an agreement whereby
JV Products will be developed and commercialized with Cepheid systems,
subsystems and consumables for use with IDI nucleic acid sequences;

WHEREAS IDI, Cepheid and the Corporation have entered into a Joint Technology
and Collaboration Agreement dated February 4, 2000; and

WHEREAS IDI, Cepheid and the Corporation have entered into a Shareholders
Agreement dated February 4, 2000.





NOW THEREFORE, in consideration of the mutual covenants and agreements
hereinafter set forth and other good and valuable consideration, the parties
hereby agree as follows:



<PAGE>   2
                                      -2-


                                    ARTICLE 1

                                   DEFINITIONS



As used in this agreement:

1.1   "AFFILIATE(s)" shall mean any corporation or other business entity
      controlled by or in common control of a party. "Control" as used herein
      means ownership directly or through one or more Affiliates, of fifty
      percent (50%) or more of the shares of the share capital entitled to vote
      for the election of directors, in the case of any corporation, or fifty
      percent (50%) or more of the equity interests in the case of any other
      type of legal entity, status as a general partner in any partnership, or
      any other arrangement whereby a party controls or has the right to control
      the board of directors or equivalent governing body of a corporation or
      other entity.

1.2   "CEPHEID" shall include all of the divisions, subsidiaries and Affiliates
      of Cepheid.

1.3   "CEPHEID INTELLECTUAL PROPERTY" shall mean all technology rights and
      patents rights (a) owned by Cepheid, existing as of the date hereof or
      developed subsequent to the date hereof and (b) relating to systems,
      subsystems and consumables for diagnosing human disease parameters
      including without limitations the patents and patents applications listed
      and described on Appendix A hereto. The Cepheid Intellectual Property
      shall also include any improvements, refinements, updates, discoveries or
      inventions related to Cepheid Intellectual Property and intellectual
      property developed by Cepheid in the course of the Collaboration Program
      as defined in the Collaboration Agreement.

1.4   "CEPHEID PRODUCTS" shall mean any products developed by Cepheid including
      but not limited to systems, subsystems and non reagent consumables to be
      incorporated in the JV Products.

1.5   "COLLABORATION AGREEMENT" shall mean the Joint Technology and
      Collaboration Agreement between the Corporation, IDI and Cepheid dated
      February 4, 2000;

1.6   "COST" shall mean [to be provided by the parties and shall take into
      account adjustment mechanisms]

1.7   "FIELD" shall mean the rapid diagnosis of human infectious diseases,
      including but not limited to bacteria, fungi, antibiotic resistance and
      related disorders, with systems integrating both IDI Intellectual Property
      and Cepheid Intellectual Property.

1.8   "IDI" shall include all of the divisions, subsidiaries and Affiliates of
      IDI.

1.9   "IDI INTELLECTUAL PROPERTY" shall mean all technology rights and patent
      rights (a) owned by IDI, existing as of the date hereof or developed
      subsequent to the date hereof and (b) relating to nucleic acid sequences
      useful for the identification and/or diagnosis of human infectious disease
      parameters, including, without limitation, the patents and patent
      applications listed and

<PAGE>   3
                                      -3-


      described on Appendix B hereto. The IDI Intellectual Property shall also
      include any improvements, refinements, updates, discoveries or inventions
      related to IDI Intellectual Property and intellectual property developed
      by IDI in the course of the Collaboration Program as defined in the
      Collaboration Agreement.

1.10  "JV PRODUCTS" shall mean any of the Corporation Products integrating both
      Cepheid Intellectual Property and IDI Intellectual Property.

1.11  "SHAREHOLDERS AGREEMENT" shall mean the Shareholders Agreement between
      IDI, Cepheid and the Corporation dated February 4, 2000, and any addenda
      and amendments of said agreement.

1.12  "TERRITORY" shall mean all of the countries in the world, including their
      respecting territories and possessions.

1.13  "TRANSFER PRICE" shall mean with respect to any Cepheid Product the price
      at which Cepheid will sell Cepheid Product to the Corporation as provided
      in Article 3 hereof.

                                    ARTICLE 2

                         LICENSE AND TECHNOLOGY TRANSFER


2.1   LICENSE GRANT

      (a)   Cepheid hereby grants to the Corporation a fully paid-up,
            royalty-free, exclusive right and license in the Territory, with the
            right to grant sublicenses, in and to all Cepheid Intellectual
            Property and Cepheid Products to make, use, offer to sell and sell
            JV Products in the Field.

      (b)   If the Corporation grants a sublicense to a third party, the
            Corporation guarantees that such sublicense shall be in conformity
            with the terms and conditions of this Agreement and the Corporation
            shall not be relieved of its obligations pursuant to this Agreement
            as a result of such sublicense.

2.2   LIMITED RIGHTS

      Notwithstanding Section 2.1, the Corporation and IDI acknowledge and
      covenant that Cepheid can make, have made, use, offer for sale, and sell
      outside the Field in the Territory, directly or indirectly, Cepheid
      Intellectual Property and Cepheid Products for use with technology other
      than IDI Intellectual Property.

2.3   CEPHEID WARRANTY

      To the best knowledge of Cepheid, Cepheid Intellectual Property and
      Cepheid Products do not infringe patents of any third party other than
      certain patents owned by Perkin Elmer for which Cepheid is currently
      negotiating a license.


<PAGE>   4
                                      -4-



                                    ARTICLE 3

                       SUPPLY AND USE OF CEPHEID PRODUCTS



3.1   EXCLUSIVE PURCHASE

      The Corporation shall exclusively purchase Cepheid Products required for
      the manufacturing and sale of the Product from Cepheid and shall not use
      any third party product or technology other than Cepheid Products and
      Cepheid Intellectual Property for the manufacture and sale of JV Products
      except for IDI Intellectual Property.

3.2   PRODUCTION

      Cepheid declares that it is and shall be in a position to produce or cause
      to be produced Cepheid Products in a quantity necessary to meet the
      Corporation's reasonable projected sales forecast projections with
      reserves to include back-up supplies in the event such may be required.

3.3   TRANSFER PRICE

      The Transfer Prices at which Cepheid shall sell Cepheid Product to the
      Corporation shall be as follows: the transfer price of Cepheid instruments
      shall be equal to the Cost of said Cepheid Instruments plus [**]; the
      transfer price of Cepheid consummables shall be established as agreed by
      both IDI and Cepheid to enable their equitable sharing of revenues and
      profits generated by the Corporation. Transfer pricing formulas will be
      periodically reviewed and adjusted as necessary upon agreement by both IDI
      and Cepheid to ensure their equitable sharing of revenues and profits
      generated by the Corporation.

3.4   TITLE TO CEPHEID PRODUCTS

      To secure the payment of all amounts due hereunder and the observance and
      performance of all the terms, provisions, agreements and covenants of this
      Agreement, Cepheid reserves ownership of all Cepheid Products sold to the
      Corporation under the terms of this Agreement until the earlier of the
      dates on which the Corporation shall have (i) resold such Cepheid Products
      to a customer or (ii) made payment in full to Cepheid of all amounts due
      hereunder. Such reservation of ownership shall operate to the maximum
      extent permitted under the laws of the country in which the respective
      Cepheid Product is physically located, and the Corporation shall comply
      with all formalities required to give effect thereto.

3.5   FORECASTS

      For the purposes of Section 3.1, the Corporation shall provide Cepheid on
      a calendar quarterly basis with an updated two year forecast in order to
      enable Cepheid to develop realistic production requirements of Cepheid
      Products for future periods.


<PAGE>   5

                                      -5-


3.6   DELAY IN SUPPLY

      In the event that Cepheid would encounter circumstances out of its control
      where the supply of the Cepheid Products could not be provided to the
      Corporation, IDI shall so advise the Corporation, in the best of delays,
      and in such a case the parties shall attempt to find alternatives to
      supply the required Cepheid Products to the Corporation during the period
      in question.

3.7   TRANSPORTATION

      All Cepheid Products to be supplied by Cepheid to the Corporation shall be
      delivered to the Corporation F.O.B. Sunnyvale, California, at the premises
      of the Corporation. Subject to the following, the parties agree that the
      term "F.O.B." shall be interpreted in accordance with the Uniform
      Commercial Code. Without limiting the generality of the foregoing, Cepheid
      Products shall be at Corporation's sole risk and responsibility as of the
      moment that Cepheid Products have been placed on board the carrier
      specified by the Corporation.

3.8   EXPORT/IMPORT LICENSE

      Notwithstanding any provisions to the contrary, the obtainment of any and
      all export and/or import licenses as well as any and all required
      governmental consents are the sole responsibility of the Corporation,
      Cepheid declaring, however that it shall collaborate with the Corporation
      in this regard.


                                    ARTICLE 4

                                  INFRINGEMENT



4.1   INFRINGEMENT

      (a)   Each party shall promptly report in writing to the other party
            during the term of this Agreement any known infringement or
            suspected infringement of any Product, Cepheid Intellectual Property
            or Cepheid Products by a third party of which it becomes aware, and
            shall provide the other party with all available evidence supporting
            said infringement or suspected infringement.

      (b)   Except as provided in paragraph (d), the Corporation shall have the
            right to initiate an infringement or other appropriate suit against
            any third party who at any time has infringed, or is suspected of
            infringing, any Product, Cepheid Intellectual Property or Cepheid
            Products. The Corporation shall give Cepheid sufficient advance
            notice of its intent to file said suit and the reasons therefor, and
            shall provide Cepheid with an opportunity to make suggestions and
            comments regarding such suit. The Corporation shall keep Cepheid
            properly informed, and shall from time to time consult with Cepheid,
            regarding the status of any such suit.

      (c)   The Corporation shall have the sole and exclusive right to select
            counsel for any suit referred to in paragraph (b) and shall pay all

<PAGE>   6
                                      -6-




            expenses of the suit, including without limitation attorney's fees
            and court costs. If necessary, Cepheid shall join as a party to the
            suit but shall be under no obligation to participate except to the
            extent that such participation is required as the result of being a
            named party to the suit. Cepheid shall offer reasonable assistance
            to the Corporation in connection therewith at no charge to the
            Corporation except for reimbursement of reasonable out-of-pocket
            expenses (not including salaries of Cepheid personnel) incurred in
            rendering such assistance. Cepheid shall have the right to
            participate and be represented in any such suit by its own counsel
            at its own expense. The Corporation shall not settle any such suit
            involving rights of IDI without obtaining the prior written consent
            of Cepheid, which consent shall not be unreasonably.

      (d)   In the event that the Corporation elects not to initiate an
            infringement or other appropriate suit pursuant to paragraph (b),
            the Corporation shall promptly advise Cepheid of its intent not to
            initiate such suit, and Cepheid shall have the right, at the expense
            of Cepheid, of initiating an infringement or other appropriate suit
            against any third party who at any time has infringed, or is
            suspected of infringing, any Product, Cepheid Intellectual Property
            or Cepheid Products. In exercising its rights pursuant to this
            paragraph (d), Cepheid shall have the sole and exclusive right to
            select counsel and shall pay all expenses of the suit, including
            without limitation, attorney's fees and court costs, and shall be
            entitled to receive and retain any damages, royalties, settlement
            fees or other consideration. If necessary, the Corporation shall
            join as a party to the suit but shall be under no obligation to
            participate except to the extent that such participation is required
            as a result of being a named party of the suit. At Cepheid's
            request, the Corporation shall offer reasonable assistance to
            Cepheid at no charge to Cepheid except for reimbursement of
            reasonable out-of-pocket expenses (not including salaries of the
            Corporation personnel) incurred in rendering such assistance. The
            Corporation shall have the right to participate and be represented
            in any such suit by its own counsel at its own expense.

4.2   CLAIMED INFRINGEMENT

      Notwithstanding anything to the contrary in this Agreement, in the event
      that any action, suit or proceeding is brought against Cepheid or the
      Corporation, licensee or sublicensee of the Corporation alleging the
      infringement of the intellectual property rights of a third party by
      reason of the manufacture, use, sale or offer for sale of Cepheid
      Products, Cepheid Intellectual Property or JV Products by the Corporation,
      the Corporation will have the obligation to defend itself and Cepheid in
      such action, suit or proceeding at the Corporation's expense. Cepheid
      shall have the right to separate counsel at its own expense in any such
      action or proceeding. The parties will cooperate with each other in the
      defense of any such suit, action or proceeding. The parties will give each
      other prompt written notice of the commencement of any such suit, action
      or proceeding or claim or infringement and will furnish

<PAGE>   7
                                      -7-




      each other a copy of each communication relating to the alleged
      infringement, but the failure to do so shall not affect the Corporation's
      obligations under this Article and under Article 5 except to the extent
      the Corporation is actually damaged thereby. The Corporation shall not
      compromise, litigate, settle or otherwise dispose of any such suit, action
      or proceeding which involves the use of Cepheid Product or Cepheid
      Intellectual Property without Cepheid's advice and prior written consent,
      provided that Cepheid shall not unreasonably withhold its consent to any
      settlement which will provide an unconditional release of Cepheid.

4.3   LIMITED LIABILITY

      Notwithstanding anything else in this Agreement or otherwise, neither
      Cepheid nor the Corporation will be liable with respect to any subject
      matter of this Agreement under any contract, negligence, strict liability
      or other legal or equitable theory for any indirect, incidental,
      consequential or punitive damages or lost profits.

4.4   WARRANTY DISCLAIMER

      The Corporation agrees that there does not exist any warranty, guarantee,
      declaration or condition, express or implied, made by Cepheid, including
      implicit warranties as to merchantability, market quality, commercial
      value and fitness for any particular purpose whatsoever relative to
      Cepheid Intellectual Property or Cepheid Products or to the incorporation
      of Cepheid Products in the JV Products.



                                    ARTICLE 5

                                 INDEMNIFICATION



      The Corporation shall indemnify, defend and hold harmless Cepheid and its
      and their respective directors, officers, employees, and agents and their
      respective successors, heirs and assigns (the "Cepheid Indemnitees"),
      against any liability, damage, loss or expense (including reasonable
      attorneys' fees and expenses of litigation) incurred by or imposed upon
      the Cepheid Indemnitees, or any of them, in connection with any claims,
      suits, actions, demands or judgments of third parties, including without
      limitation, personal injury and product liability matters (except in cases
      where such claims, suits, actions, demands or judgments result from
      willful misconduct, gross negligence or material breach of this Agreement
      on the part of Cepheid Indemnitees) arising out of the development,
      testing, production, manufacture, promotion, import, sale or use by any
      person of any JV Products, Cepheid Products or Cepheid Intellectual
      Property manufactured or sold by the Corporation or by a licensee,
      sublicensee, distributor or agent of the Corporation. The Corporation
      shall have no obligation under this Article 5 with respect to incidental,
      indirect, or consequential damages or lost profits of Cepheid.


<PAGE>   8
                                      -8-




                                    ARTICLE 6

                       CONFIDENTIALITY AND NON-DISCLOSURE



      The parties agree that the Confidentiality provisions contained in the
      Shareholders Agreement apply to this Agreement with the necessary changes
      having been made.




                                    ARTICLE 7

                              TERM AND TERMINATION



7.1   TERM AND TERMINATION

      This Agreement shall continue in full force and effect until the
      expiration of the 6 month period following receipt by IDI or Cepheid of a
      notice of winding up sent pursuant to Article 4 of the Shareholders
      Agreement.

7.2   SURVIVAL OF OBLIGATIONS

      Articles 4, 5 and 6 of this Agreement shall survive its termination.

7.3   RETURN OF CEPHEID PRODUCTS

      Cepheid shall have the right at its option to repurchase all or any part
      of the inventories of Cepheid Products in the Corporation's possession as
      of the termination of this Agreement at Cepheid's invoice price to the
      Corporation for such Cepheid Products less any appropriate amount for
      excessive wear and tear. Cepheid shall exercise its option by notifying
      the Corporation in writing no later than 30 days after the effective
      termination date.




                                    ARTICLE 8

                                    DISPUTES


8.1   NEGOTIATION AND MEDIATION

      If a dispute arises out of or relates to this Agreement or its breach (the
      "Matter"), the parties agree to resolve the Matter as follows:

      (a)   A party shall submit written notice of the Matter to the other
            parties and request negotiation.

      (b)   The parties shall attempt in good faith to resolve any Matter
            arising out of or relating to this Agreement promptly by negotiation
            between representatives which the parties may appoint, and

      (c)   If the Matter has not been resolved within 60 days of a party's
            request for negotiation, either party may request that the Matter be
            submitted

<PAGE>   9
                                      -9-



      to a sole mediator selected by the parties for a mandatory 1 day
      mediation;

8.2   ARBITRATION

      If the Matter has not been resolved by such mediation, either party may
      submit the Matter for binding arbitration, to a sole arbitrator in
      accordance with the Rules of Conciliation and Arbitration of the
      International Chamber of Commerce as in effect on the date of commencement
      of such arbitration, (the "ICC Rules") if Cepheid initiates such
      arbitration, and pursuant to the Rules of the American Arbitration
      Association as in effect on the date of commencement of such arbitration
      (the "AAA Rules") if Corporation initiates such arbitration, except where
      such ICC Rules conflict with the provisions of Article 8 in which event
      the provisions of this Article 8 shall prevail.

8.3   APPOINTMENT OF ARBITRATOR

      If the parties fail to agree on the appointment of the sole arbitrator
      within 20 days after one party has served the other party, a written
      notice to concur in the appointment of the single arbitrator nominated by
      the serving party, the sole arbitrator shall be appointed in accordance
      with the ICC Rules or AAA Rules, as the case may be. The sole arbitrator
      shall be a member of the Quebec Bar if the ICC Rules apply or the
      California Bar if the AAA Rules apply with at least 10 years of experience
      in corporate commercial or intellectual property law. The arbitrator shall
      render any final award within 20 days following the completion of evidence
      and arguments on the Matter.

8.4   ADMISSIBILITY OF EVIDENCE IN OTHER PROCEEDINGS

      The parties shall not be entitled to rely on or introduce as evidence
      before any arbitral proceedings whether or not such proceedings relate to
      the Matter that is the subject of the negotiations:

      (a)   Views expressed or suggestions made by another party in respect of a
            possible settlement of the Matter;

      (b)   Admissions or proposals made by another party in the course of
            negotiations; or

      (c)   The fact that the other party had indicated his willingness to
            accept a proposal for settlement made by another party.

8.5   LOCATION

      The mediation and arbitration shall be held in Montreal, Quebec. if
      Cepheid initiates the arbitration and in San Francisco, California if the
      Corporation initiates the arbitration. The parties, their representatives,
      the mediator and the arbitrator shall hold the existence, contend and
      results or any negotiation, mediation or arbitration in confidence unless
      disclosure is required by law or regulation, and in such case the parties
      shall take reasonable precautions to only disclose what is required by law
      or governmental regulation. All proceedings and all pleadings shall be in
      English.


<PAGE>   10
                                      -10-


8.6   AWARD

      Any award of the Arbitration shall be final and binding on the parties and
      shall be enforceable in any court having jurisdiction over the party from
      whom enforcement is requested.




                                    ARTICLE 9

                                     NOTICES



      Any notice, request, instruction or other document to be given hereunder
      shall be deemed validly given if in writing, and delivered personally,
      sent by overnight courier, or sent by certified mail, postage prepaid,
      return receipt requested, as follows:

        If to Cephied:
        -------------

        Cepheid
        1190 Borregas Avenue
        Sunnyvale, CA, 94089-1302
        Attn:  Thomas L. Gutshall
        Facsimile: (408) 541-4192


        and if to the Corporation:
        -------------------------

        Aridia Corp.
        2050 Rene Levesque Blvd. West
        Ste-Foy, Quebec, Canada G1V 2K8
        Attn:  Dr. Pierre Coulombe
        Facsimile: (418) 681-5254

        And copy to: Thomas L. Gutshall
        Facsimile: (408) 541-4192


        and copy to IDI:
        ---------------

        Infectio Diagnostic (I.D.I.) Inc.
        2050 Rene Levesque Blvd. West
        Ste-Foy, Quebec, Canada G1V 2K8
        Attn:  Dr. Pierre Coulombe
        Facsimile: (418) 681-5254



        Alternatively, notices and other communications may be sent by facsimile
        transmission with a confirmation copy sent by one of the forms of
        delivery set forth above. All notices and other communications shall be
        deemed delivered on the date of actual receipt.



<PAGE>   11
                                      -11-




                                   ARTICLE 10

                                  MISCELLANEOUS



10.1  ENTIRE AGREEMENT

      This Agreement along with the Collaboration Agreement, the Shareholders
      Agreement and the License and Supply Agreement between IDI and the
      Corporation constitutes the entire understanding between the parties with
      respect to the subject matter hereof and supersedes and replaces all prior
      agreements, understandings, writings and discussions between the parties
      relating to said subject matter. Only a written instrument executed by the
      parties may amend this Agreement.

10.2  WAIVER

      The failure of either party at any time or times to require performance of
      any provision hereof shall in no manner affect its rights at a later time
      to enforce the same. No waiver by either party of any condition or term in
      any one or more instances shall be construed as a further or continuing
      waiver of such condition or term or any other condition or term.

10.3  SUCCESSORS AND ASSIGNS

      This Agreement shall be binding upon and inure to the benefit of and be
      enforceable by the parties hereto and their respective successors and
      assigns and Cepheid shall not assign this Agreement without the prior
      written consent of the Corporation which cannot be unreasonably withheld.

10.4  FORCE MAJEURE

      Any delays in or failure of performance by either party under this
      Agreement shall not be considered a breach of this Agreement if and to the
      extent caused by occurrences beyond the reasonable control of the party
      affected, including but not limited to acts of God; acts, regulations, or
      laws of any government; strikes or other considered acts of workers;
      fires; floods; explosions; riots; wars; rebellion; and sabotage; and any
      time for performance hereunder shall be extended by the actual time of
      delay caused by such occurrence.

10.5  SEVERABILITY

      If any provision(s) of this Agreement are or become invalid, or ruled
      illegal by any court of competent jurisdiction, or are deemed
      unenforceable under then current applicable law from time to time in
      effect during the term hereof, it is the intention of the parties that the
      remainder of this Agreement shall not be affected thereby. It is further
      the intention of the parties that in lieu of each such provision which is
      invalid, illegal, or unenforceable, there be substituted or added as part
      of this Agreement, a provision which shall be as similar as possible in
      economic and business objectives as intended by the parties to such
      invalid, illegal, or unenforceable provision, but which shall be valid,
      legal, and enforceable, and shall be mutually agreed by the parties.
<PAGE>   12

                                      -12-


10.6  HEADINGS

      The headings contained herein are for reference purposes only and shall
      not in any way affect the meaning of this Agreement.

10.7  COUNTERPARTS

      This Agreement may be executed in any number of counterparts, each of
      which shall be an original, but all of which together shall constitute one
      instrument.

10.8  NO AGENCY

      Nothing contained in this Agreement shall be deemed to create a
      partnership between the Corporation and Cepheid. Neither party shall be
      liable for the act of the other party unless the other party expressly
      authorizes such act in writing.

10.9  GOVERNING LAW

      As to matters affecting Cepheid Intellectual Property, this Agreement
      shall be governed by and construed in accordance with the laws of the
      State of California, without regard to the application of principles of
      conflicts of laws thereof. As to other matters, this Agreement shall be
      governed by and construed in accordance with the laws of the Province of
      Quebec, without regard to the application of principles of conflicts of
      laws thereof.



        IN WITNESS WHEREOF, the parties have executed this Agreement as of the
date first above written.


CEPHEID                                     ARIDIA CORP.



Per: /s/ THOMAS L. GUTSHALL                 Per:   /s/ DR. PIERRE COULOMBE
    ------------------------------              -------------------------------
      Thomas L. Gutshall                         Dr. Pierre Coulombe


                                            Per: /s/ THOMAS L. GUTSHALL
                                                -------------------------------
                                                   Thomas L. Gutshall


IDI Inc. intervenes to declare that it has taken cognizance of this Agreement
and that it accepts to be bound by Sections 2.2, 3.3 and 7.1.

INFECTIO DIAGNOSTIC (I.D.I.) INC.



Per:  /s/ DR. PIERRE COULOMBE
    -------------------------------
        Dr. Pierre Coulombe


<PAGE>   13



                                   APPENDIX A

                         CEPHEID INTELLECTUAL PROPERTY
<PAGE>   14


                                   APPENDIX A

                       TO THE LICENSE AND SUPPLY AGREEMENT
                        BETWEEN ARIDIA CORP. AND CEPHEID

                     CEPHEID PATENT RIGHTS AND APPLICATIONS


I.    Reaction vessel for heat-exchanging chemical processes.

<TABLE>
<CAPTION>
                                PATENT
         COUNTRY                NUMBER              ISSUED
<S>                           <C>              <C>
        UNITED STATES         US 5,958,349     Sept. 28, 1999
</TABLE>

<PAGE>   15



                                   APPENDIX B

                            IDI INTELLECTUAL PROPERTY