SHARE PURCHASE AGREEMENT

         This Share Purchase Agreement ("Agreement"), dated as of March 2, 2000,
among Jeff Ploen,  Scott Deitler,  Wintrade Fund, LLC, Lawrence Deitler and Jimm
Toot, (SELLERS), Investra Enterprises, Inc. ("IEI") and Pathobiotek Diagnostics,
Inc., (BUYER) a Texas Corporation.

                              W I T N E S S E T H:

     A.  WHEREAS,  INVESTRA  ENTERPRISES,  INC.  ("IEI") is a  corporation  duly
organized under the laws of the State of Florida.

     B. WHEREAS,  BUYER wishes to purchase 100% of the outstanding common shares
of IEI free and clear of liens and encumbrances from SELLER.

     C. WHEREAS, the parties hereto wish to enter into this Agreement,  pursuant
to the provisions of the Texas Statutes.

     NOW, THEREFORE, it is agreed among the parties as follows:

                                    ARTICLE I

                                THE CONSIDERATION

         1.1 Subject to the  conditions  set forth herein on the "Closing  Date"
(as herein  defined),  SELLER shall sell and BUYER shall purchase 672,000 common
shares of IEI common stock.  The  transactions  contemplated  by this  Agreement
shall be completed at a closing  ("Closing") on a closing date ("Closing  Date")
on or before March 5, 2000.  The purchase price for the IEI shares to be paid by
BUYER to SELLERS is  $150,000,  $25,000 of which is paid  herewith  and $125,000
which shall be delivered at closing.

         On the Closing Date,  all of the documents to be furnished  pursuant to
this Agreement,  including the documents to be furnished  pursuant to Article VI
of this  Agreement,  shall be  delivered to M.A.  Littman,  to be held in escrow
until all closing conditions  hereunder have been met or the date of termination
of this Agreement,  but no longer than 1 day after closing date, whichever first
occurs,  and  thereafter  shall be promptly  distributed to the parties as their
interests may appear.

         1.2 Concurrent with the execution hereof,  BUYER shall deposit or cause
to be deposited with M.A.  Littman as a  non-refundable  consideration  for this
agreement,  the sum of $25,000.  Further,  the sum of $125,000  shall be paid at
closing for  delivery to SELLERS  upon  receipt of the shares  (672,000)  of IEI
common stock, constituting 100% of the outstanding common stock of IEI.


<PAGE>



                                   ARTICLE II

                              CONVEYANCE OF SHARES

         2.1 The shares of no par value  common  stock of IEI shall be delivered
and conveyed by SELLERS to BUYER at closing by SELLERS with duly executed  stock
powers, upon receipt of the cash consideration by SELLERS.

         2.2 SELLERS  represent  that no  outstanding  options or  warrants  for
unissued shares exist for IEI.

                                   ARTICLE III

          REPRESENTATIONS, WARRANTIES AND COVENANTS OF SELLER AS TO IEI

     SELLERS  hereby  represent,  warrants and covenants to BUYER and will cause
IEI to so  represent  and  warrant,  except  as  stated  in the  IEI  Disclosure
Statement, as follows:

         3.1 IEI is a corporation  duly organized,  validly existing and in good
standing under the laws of the State of Florida, and has the corporate power and
authority to own or lease its  properties  and to carry on its business as it is
now being conducted.  The Articles of Incorporation and Amendments and Bylaws of
IEI,  copies of which have been  delivered to BUYER,  are complete and accurate,
and the minute books of IEI contain a record,  which is complete and accurate in
all  material  respects,  of all  meetings,  and all  corporate  actions  of the
shareholders and Board of Directors of IEI.

         3.2 The aggregate  number of shares which IEI is authorized to issue is
50,000,000  shares  of  common  stock  with no par  value  per  share,  of which
approximately   672,000   shares  of  such  common  stock  will  be  issued  and
outstanding, fully paid and non-assessable, at closing under this agreement. IEI
has no outstanding options,  warrants or other rights to purchase,  or subscribe
to, or securities  convertible  into or  exchangeable  for any shares of capital
stock.

         3.3 IEI and SELLERS have complete and unrestricted  power to enter into
and,  upon the  appropriate  approvals  as required by law,  to  consummate  the
transactions contemplated by this Agreement.

         3.4  Neither  the  making  of nor the  compliance  with the  terms  and
provisions of this Agreement and consummation of the  transactions  contemplated
herein by IEI will  conflict  with or result  in a breach  or  violation  of the
Articles of Incorporation or Bylaws of IEI.

         3.6 IEI has  delivered to BUYER  Audited  financial  statements  of IEI
dated August 31,  1999.  At or prior to closing IEI shall have filed its 10Q for
November  30,  1999,   including  unaudited  financial   statements.   All  such
statements, herein sometimes called "IEI Financial Statements" are (and will be)
complete and correct in all material  respects  and,  together with the notes to
these financial statements, present fairly the financial position and results of
operations of IEI of the periods indicated. All financial statements of IEI will
have been prepared in accordance with generally accepted accounting principles.

<PAGE>


         3.7 Since the dates of the IEI  Financial  Statements,  there  have not
been any material  adverse  changes in the business or  condition,  financial or
otherwise,  of IEI. IEI does not have any material  liabilities or  obligations,
secured or unsecured  except as shown on updated  financials  (whether  accrued,
absolute, contingent or otherwise).

         3.8 There are no pending legal proceedings  involving IEI, there are no
legal proceedings or regulatory  proceedings  involving material claims pending,
or, to the knowledge of the SELLERS,  threatened against IEI or affecting any of
its assets or properties,  and IEI is not in any material breach or violation of
or default  under any  contract or  instrument  to which IEI is a party,  and no
event has occurred which with the lapse of time or action by a third party could
result in a material breach or violation of or default by IEI under any contract
or  other  instrument  to  which  IEI is a party  or by  which  it or any of its
properties may be bound or affected,  or under its Articles of  Incorporation or
Bylaws, nor is there any court or regulatory order pending, applicable to IEI.

         3.9 IEI shall not enter into or consummate  any  transactions  prior to
the Closing Date other than in the  ordinary  course of business and will pay no
dividend,  or increase the  compensation of officers and will not enter into any
agreement or transaction which would adversely affect its financial condition.

         3.10  IEI is not a party to any contract performable in the future.

         3.11 The  representations  and  warranties  of SELLERS and IEI shall be
true and correct as of the date hereof and as of the Closing Date.

         3.12 IEI shall deliver to BUYER, all of its corporate books and records
for review.  IEI will also  deliver to BUYER on or before the  Closing  Date any
reports  relating to the  financial  and  business  condition of IEI which occur
after the date of this  Agreement  and any other  reports sent  generally to its
shareholders after the date of this Agreement.

         3.13  IEI has no employee benefit plan in effect at this time.

         3.14 No representation or warranty by IEI or SELLERS in this Agreement,
the IEI  Disclosure  Statement  or any  certificate  delivered  pursuant  hereto
contains any untrue  statement of a material fact or omits to state any material
fact necessary to make such representation or warranty not misleading.

         3.15 SELLERS or IEI has delivered,  to BUYER true and correct copies of
the 10-SB and each of its other  reports to  shareholders  and  filing  with the
Securities and Exchange Commission ("SEC") for the year ended December 31, 1999.
IEI will  also  deliver  to BUYER on or  before  the  Closing  Date any  reports
relating to the financial and business condition of IEI which are filed with the
SEC after the date of this Agreement and any other reports sent generally to its
shareholders after the date of this Agreement.
<PAGE>

         3.16 IEI has duly filed all  reports  required  to be filed by it under
the Securities Act of 1933, as amended, and the Securities Exchange Act of 1934,
as amended,  (the "Federal  Securities  Laws"). No such reports,  or any reports
sent to the  shareholders  of IEI generally,  contained any untrue  statement of
material  fact or  omitted  to state any  material  fact  required  to be stated
therein or necessary  to make the  statements  in such  report,  in light of the
circumstances under which they were made, not misleading.

         3.17 SELLERS hereby covenant that during the contract period,  prior to
closing, IEI will not take any board action without BUYER's approval in writing,
pending selection of new officers and directors at closing.

         3.18  SELLERS own  672,000 IEI shares  being sold to the BUYER free and
clear of any liens and  encumbrances  and may transfer  such shares  without the
consent of any third party.

                                   ARTICLE IV

               OBLIGATIONS OF THE PARTIES PENDING THE CLOSING DATE

         4.1 At all times prior to the  Closing  Date  during  regular  business
hours, each party will permit the other to examine its books and records and the
books and  records  of its  subsidiaries  and will  furnish  copies  thereof  on
request.  It is recognized that, during the performance of this Agreement,  each
party may provide the other parties with  information  which is  confidential or
proprietary  information.  During the term of this Agreement, and for four years
following the termination of this Agreement,  the recipient of such  information
shall protect such information from disclosure to persons, other than members of
its own or affiliated  organizations and its professional  advisers, in the same
manner as it protects  its own  confidential  or  proprietary  information  from
unauthorized  disclosure,  and  not  use  such  information  to the  competitive
detriment of the disclosing party. In addition,  if this Agreement is terminated
for any reason,  each party shall  promptly  return or cause to be returned  all
documents  or  other  written  records  of  such   confidential  or  proprietary
information,  together with all copies of such writings and, in addition,  shall
either  furnish or cause to be furnished,  or shall  destroy,  or shall maintain
with such standard of care as is exercised with respect to its own  confidential
or proprietary information, all copies of all documents or other written records
developed  or  prepared  by such  party  on the  basis of such  confidential  or
proprietary  information.  No information  shall be considered  confidential  or
proprietary if it is (a)  information  already in the possession of the party to
whom  disclosure  is made,  (b)  information  acquired  by the party to whom the
disclosure is made from other sources,  or (c)  information in the public domain
or  generally  available to  interested  persons or which at a later date passes
into the public domain or becomes  available to the party to whom  disclosure is
made without any wrongdoing by the party to whom the disclosure is made.
<PAGE>

         4.2  SELLERS  and  BUYER  shall   promptly   provide  each  other  with
information  as to any  significant  developments  in the  performance  of  this
Agreement,  and shall promptly  notify the other if it discovers that any of its
representations,  warranties and covenants contained in this Agreement or in any
document delivered in connection with this Agreement was not true and correct in
all material respects or became untrue or incorrect in any material respect.

         4.3 All parties to this Agreement  shall take all such action as may be
reasonably  necessary and  appropriate and shall use their best efforts in order
to consummate the transactions contemplated hereby as promptly as practicable.

                                    ARTICLE V

                              PROCEDURE FOR CLOSING

         5.1 At the Closing  Date,  the purchase and Sale shall be effected with
common  stock  certificates  of IEI being  delivered  duly  executed for 672,000
shares of common  stock to BUYER and the  delivery  of  $150,000  in a cashier's
check to SELLERS from BUYER,  together  with  delivery of all other  agreements,
schedules, warranties and representations set forth in this Agreement.

                                   ARTICLE VI

                           CONDITIONS PRECEDENT TO THE

                          CONSUMMATION OF THE PURCHASE

         The  following  are  conditions  precedent to the  consummation  of the
Agreement on or before the Closing Date:

         6.1  SELLERS  shall  have  performed  and  complied  with  all  of  its
respective  obligations  hereunder which are to be complied with or performed on
or before the  Closing  Date and  SELLERS  and IEI and BUYER  shall  provide one
another at the  Closing  with a  certificate  to the effect  that such party has
performed each of the acts and undertakings required to be performed by it on or
before the Closing Date pursuant to the terms of this Agreement.

         6.2 No action,  suit or proceeding  shall have been instituted or shall
have  been  threatened  before  any court or other  governmental  body or by any
public authority to restrain,  enjoin or prohibit the transactions  contemplated
herein,  or which might subject any of the parties hereto or their  directors or
officers to any material liability,  fine,  forfeiture or penalty on the grounds
that the transactions contemplated hereby, the parties hereto or their directors
or officers,  have violated any  applicable  law or regulation or have otherwise
acted improperly in connection with the transactions  contemplated  hereby,  and
the parties  hereto have been  advised by counsel  that,  in the opinion of such
counsel,  such action, suit or proceeding raises substantial questions of law or
fact which could  reasonably  be decided  adversely  to any party  hereto or its
directors or officers.
<PAGE>

         6.3 All actions,  proceedings,  instruments  and documents  required to
carry out this Agreement and the transactions  contemplated  hereby and the form
and  substance  of all legal  proceedings  and related  matters  shall have been
approved by counsel for BUYER.

         6.4 The  representations  and  warranties  made by BUYER and SELLERS in
this Agreement shall be true as though such  representations  and warranties had
been made or given on and as of the Closing Date, except to the extent that such
representations  and  warranties  may be  untrue on and as of the  Closing  Date
because of (1) changes caused by  transactions  suggested or approved in writing
by BUYER or (2)  events or changes  (which  shall not,  in the  aggregate,  have
materially and adversely affected the business,  assets, or financial  condition
of IEI during or arising after the date of this Agreement.)

         6.5 All  outstanding  liabilities  of IEI  shall  have  been  paid  and
released prior to closing.

         6.6 The Share  Exchange  Agreement  between  IEI and the BUYER which is
currently being negotiated will close concurrently with the closing hereof.


                                   ARTICLE VII

                           TERMINATION AND ABANDONMENT

         7.1   Anything   contained   in   this   Agreement   to  the   contrary
notwithstanding, the Agreement may be terminated and abandoned at any time prior
to the Closing Date:

     (a) By mutual consent of parties;

     (b) By either  party,  if any condition set forth in Article VI relating to
the other party has not been met or has not been waived;

     (c) By BUYER, if any suit,  action or other  proceeding shall be pending or
threatened by the federal or a state government before any court or governmental
agency,  in which it is sought to  restrain,  prohibit or  otherwise  affect the
consummation of the transactions contemplated hereby;

     (d) By any party, if there is discovered any material  error,  misstatement
or omission in the representations and warranties of another Party;

     (e) By any party if the  Agreement  Closing Date is not within 30 days from
the date hereof; or
<PAGE>

         7.2 Any of the terms or conditions  of this  Agreement may be waived at
any time by the party which is entitled to the benefit thereof,  by action taken
by him or the Board of Directors,  provided;  however, that such action shall be
taken only if, in the  judgment of the Board of  Directors  or Party  taking the
action,  such waiver will not have a materially  adverse  effect on the benefits
intended under this Agreement to the party waiving such term or condition.

         7.3 The  deposit of $25,000  paid as  consideration  herefore  shall be
non-refundable  if this  transaction  does not close due to the  failure  of the
BUYER to  perform  under the terms and  conditions  of this  Agreement.  If this
transaction  does not close due to the failure of the  SELLERS to perform  under
the terms and  conditions  of this  Agreement or due to the breach by IEI of its
representations  and  warranties  under this  agreement,  the  deposit  shall be
returned to the BUYER.

                                  ARTICLE VIII

                        TERMINATION OF REPRESENTATION AND
                        WARRANTIES AND CERTAIN AGREEMENTS

         8.1 The respective representations and warranties of the parties hereto
shall expire with, and be terminated and  extinguished  by  consummation  of the
Agreement;  provided,  however, that the covenants and agreements of the parties
hereto shall survive in accordance with their terms.


<PAGE>


                                   ARTICLE IX

                                  MISCELLANEOUS

         9.1 This Agreement  embodies the entire agreement  between the parties,
and there have been and are no agreements,  representations  or warranties among
the parties other than those set forth herein or those provided for herein.

         9.2 To  facilitate  the  execution  of this  Agreement,  any  number of
counterparts  hereof may be executed,  and each such counterpart shall be deemed
to  be  an  original  instrument,  but  all  such  counterparts  together  shall
constitute but one instrument.

         9.3 All parties to this Agreement agree that if it becomes necessary or
desirable to execute further instruments or to make such other assurances as are
deemed  necessary,  the party  requested  to do so will use its best  efforts to
provide such executed  instruments or do all things necessary or proper to carry
out the purpose of this Agreement.

         9.4  This  Agreement  may be  amended  upon  approval  of the  Board of
Directors of BUYER and SELLERS.

         9.5  Any  notices,   requests,  or  other  communications  required  or
permitted  hereunder shall be delivered  personally or sent by overnight courier
service, fees prepaid, addressed as follows:

To SELLERS:





copy to:          Michael A. Littman
                  Attorney at Law
                  10200 W. 44th Ave., #400
                  Wheat Ridge, CO 80033


To BUYER:

Pathobiotek Diagnostics, Inc.
c/o Robert C. Simpson
7010 NW 100 Drive, Ste. A-101
Houston, TX  77092


copy to:


or such other  addresses as shall be furnished in writing by any party,  and any
such notice or  communication  shall be deemed to have been given as of the date
received.

         9.6 No press release or public statement will be issued relating to the
transactions  contemplated by this Agreement without prior approval of BUYER and
SELLERS.  However,  IEI may issue at any time any press  release or other public
statement  it believes on the advice of its counsel it is  obligated to issue to
avoid  liability  under the law relating to  disclosures,  but the party issuing
such press release or public  statement  shall make a reasonable  effort to give
the other party prior notice of and  opportunity  to participate in such release
or statement.
<PAGE>

         9.7  Concurrent  with the closing  hereunder,  BUYER shall cause IEI to
issue to the  SELLERS  Options to  purchase a total of 100,000  shares of common
stock of IEI for a period of one year  after the  closing at a price of $.50 per
share, and shall grant piggyback registration rights therewith.

         IN WITNESS WHEREOF, the parties have set their hands and seals this 2nd
day of March, 2000.

                                            SELLERS:


                                            /s/Lawrence Deitler

                                            Lawrence Deitler

                                            /s/Scott Deitler
                                            Scott Deitler

                                            Wintrade Fund, LLC

                                            By: /s/Scott Deitler
                                            Scott Deitler

                                            /s/Jim Toot
                                            Jim Toot

                                            /s/Jeff Ploen
                                            Jeff Ploen

                                            Investra Enterprises, Inc.

                                            By:/s/Scott Deitler
                                            Scott Deitler, President

                                            BUYER:

                                            Pathobiotek Diagnostics, Inc.

                                            By:/s/Robert C. Simpson
                                            Robert C. Simpson, President