Exhibit 10.26


                      THIRD MODIFICATION OF LOAN AGREEMENT


THIS THIRD  MODIFICATION  is made as of this 17th day of December,  1999, by and
between IMMUCOR,  INC., a Georgia corporation  ("Borrower"),  and WACHOVIA BANK,
N.A., a national banking association ("Lender").

                               Statement of Facts

                  Lender  and   Borrower   are  parties  to  that  certain  Loan
Agreement, dated as of October 27, 1998, as modified and amended by that certain
First  Modification  of Loan  Agreement,  dated  as of April  30,  1999 , and as
further  modified  and  amended  by that  certain  Second  Modification  of Loan
Agreement,  dated as of December  10, 1999 (the "Loan  Agreement"),  pursuant to
which  Lender  has  agreed  to make one or more  loans  from time to time to the
Borrower  in  accordance  with the  terms and  conditions  thereof.  Lender  and
Borrower  desire  to modify  the Loan  Agreement  in  certain  respects,  all in
accordance with and subject to the terms and conditions set forth herein.

                  NOW,  THEREFORE,   in  consideration  of  the  premises,   the
covenants  and  agreements   contained  herein,  and  other  good  and  valuable
consideration,  the  receipt  and  adequacy  of which are  hereby  acknowledged,
Borrower and Lender do hereby agree that all capitalized terms used herein shall
have the meanings  ascribed  thereto in the Loan Agreement  (except as otherwise
expressly defined or limited herein) and do hereby further agree as follows:

                               Statement of Terms

1. Amendments of Loan Agreement. Subject to the fulfillment of the
conditions precedent to the effectiveness of this Third Modification which
are set forth below, the Loan Agreement shall be amended from and after
this date as follows:

     (a)  The Loan  Agreement is hereby  amended by adding each of the following
          definitions  to Section  1.1  thereof in the  appropriate
          alphabetical order:

          "Adjusted  Interbank  Offered  Rate" shall mean,  with respect to each
     Interest  Period,  the sum of (i) the rate  obtained  by  dividing  (A) the
     Interbank  Offered Rate for such Interest Period by (B) a percentage  equal
     to 1 minus the then  stated  maximum  rate  (stated  as a  decimal)  of all
     reserve  requirements   (including,   without  limitation,   any  marginal,
     emergency,  supplemental,  special  or other  reserves)  applicable  to any
     member bank of the Federal  Reserve  System as defined in  Regulation D (or
     against any successor  category of liabilities as defined in Regulation D),
     plus (ii) a percentage  sufficient to  compensate  the Bank for the cost of
     complying with any reserves,  liquidity and/or special deposit requirements
     of any other  foreign  governmental  or  regulatory  authority  directly or
     indirectly  affecting the  maintenance  or funding of the Third  Additional
     Term Loan.

          "Cn.  Dollars" and "Cn.$" shall mean dollars in the lawful currency of
     Canada.

          "Dollars"  shall mean dollars in lawful  currency of the United States
     of America.

          "Dollar Equivalent" shall mean, with respect to any monetary amount in
     Cn.  Dollars,  at any time for the  determination  thereof,  the  amount of
     Dollars  obtained by converting  such amount of Cn. Dollars into Dollars at
     the spot rate for the purchase of Dollars with Cn. Dollars as quoted by the
     Lender  at   approximately   11:00  a.m.   London  time,  on  the  date  of
     determination  thereof  specified  herein or, if the date of  determination
     thereof is not  otherwise  specified  herein,  on the date which is two (2)
     Business Days prior to such determination.

          "Interbank  Offered Rate" means, for any Interest Period,  the offered
     rate for deposits in Cn.  Dollars for a term  comparable  to such  Interest
     Period and in an amount  comparable to the Third  Additional  Term Loan, as
     such offered rate appears on Telerate  Page 3750 as of 11:00 A.M.  (London,
     England time) on the Interest  Determination Date. If the foregoing rate is
     unavailable  from  Telerate  for  any  reason,  then  such  rate  shall  be
     determined by the Lender from any other interest rate reporting  service of
     recognized standing designated in writing by the Lender to the Borrower.

          "Third Additional Term Loan" shall mean the term loan in the principal
     amount of  Cn.$5,741,000  to be made by Lender to Borrower  pursuant to the
     provisions of Section 2.1.5.

          "Third  Additional  Term Note" shall mean this term  promissory  note,
     dated December 17, 1999, as amended or  supplemented  from time to time, in
     the stated  principal  amount  equal to the  committed  amount of the Third
     Additional Term Loan,  together with any renewals or extensions thereof, in
     whole or in part.

          "Third  Modification  Effective Date" shall mean the date on which all
     of the  conditions  precedent to the  effectiveness  of that certain  Third
     Modification to Loan Agreement,  dated as of December 17, 1999, between the
     Borrower and the Lender, have been satisfied.

     (b) The Loan  Agreement is hereby amended by amending each of the following
     definitions in Section 1.1 ----------- to read as follows:

          "Business  Day"  shall  mean a day on  which  Lender  is open  for the
     conduct of banking  business at its principal  office in Atlanta,  Georgia;
     provided,  however, that for purposes of determining the timing of requests
     for, and establishing the Applicable Rate, on LIBOR  Borrowings,  "Business
     Day" shall mean, additionally, any day on which dealings with United States
     Dollar  deposits  (or,solely in the case of the third  Additional Term Loan
     Cn.  Dollar  deposits)  are also being  carried out by Lender in the London
     interbank Eurodollar market.

          "LIBOR Rate" shall mean,  except as provided below with respect to the
     Third  Additional  Term Loan,  with  respect  to any  Interest  Period,  an
     interest  rate per  annum  computed  by  dividing:  (x) the rate per  annum
     determined by Lender from time to time on the basis of the offered rate for
     deposits in United States dollars in the London interbank  borrowing market
     of amounts  equal to or  comparable  to the amount of the Loan (or  portion
     thereof)  to  which  such  Interest  Period  relates  offered  for  a  term
     comparable  to such  Interest  Period,  which rate  appears on the  display
     designated  as page "3750" of the  Telerate  Service (or such other page as
     may replace page "3750" of that  service or such other  service or services
     as may be nominated by the British Bankers'  Association for the purpose of
     displaying   London  interbank  offered  rates  for  United  States  dollar
     deposits) as of 11:00 a.m., London time, on the Interest Rate Determination
     Date  applicable  to such  Interest  Period,  which  rate  shall be rounded
     upward, to the next higher 1/10,000 of 1%; provided,  however, that if more
     than one such offered rate appears on such page,  the offered rate shall be
     deemed to be the arithmetic  average (rounded upward, if necessary,  to the
     next  higher of 1/100 of 1%) of such  offered  rates;  by (y) the  number 1
     minus any then applicable  percentage  (expressed as a decimal) which is in
     effect on such day, as  prescribed by the Board of Governors of the Federal
     Reserve  System (or its  successor)  for  determining  the maximum  reserve
     requirement  for a member  of the  Federal  Reserve  System in  respect  of
     "Eurocurrency  liabilities"  (or any other  category of  liabilities  which
     includes  deposits  by  reference  to  which  the  interest  rate  on  such
     Borrowings  is  determined or any category of extensions of credit or other
     assets  which  includes  loans by a non-United  States  office of Lender to
     United  States  residents);  provided,  however,  with respect to the Third
     Additional  Term Loan "LIBOR Rate" shall mean, with respect to any Interest
     Period,  the  Adjusted  Interbank  Offered  Rate.  The LIBOR  Rate shall be
     adjusted automatically on and as of the effective date of any change in the
     percentage described in the foregoing clause (y).

          "Loans" shall mean the Advances under the Line of Credit together with
     the  Acquisition  Term  Loans,  the  Additional  Term  Loans  and the Third
     Additional Term Loan.

          "Notes" shall mean,  collectively,  the Master Note,  the  Acquisition
     Term Note, the Additional Term Note and the Third Additional Term Note.

          "Term Loans" shall mean the  Acquisition  Term Loans,  the  Additional
     Term Loans and the Third Additional Term Loan.

     (c) The Loan  Agreement is hereby  amended by adding the following  Section
     2.1.5 thereto:

                           2.1.5 Third  Additional  Term Loan.  (a) On the Third
         Modification Effective Date, and subject to the terms and conditions of
         this Agreement, Lender agrees to make the Third Additional Term Loan to
         Borrower, the proceeds of which shall be used (after being converted to
         Dollars) by Borrower solely to finance the repayment of the outstanding
         principal  amount of the Second  Additional Term Loan. The Debt arising
         from the making of the Third Additional Term Loan shall be evidenced by
         the Third Additional Term Note, which shall be executed by Borrower and
         delivered  to Lender  on the Third  Modification  Effective  Date.  The
         principal  amount of the Third  Additional Term Loan shall be repaid by
         the Borrower in installments  as provided in the Third  Additional Term
         Note. In any event on December 1, 2002, the unpaid principal balance of
         the Third  Additional  Term Loan  together  with all accrued but unpaid
         interest thereon shall be due and payable in full. The Third Additional
         Term Loan shall bear interest at the  Applicable  Rate,  calculated and
         payable in the manner described in Section 2.2.1, from the date thereof
         on the unpaid principal  amount thereof from time to time  outstanding.
         The Third Additional Term Loan may be prepaid,  in whole or in part, by
         Borrower at any time or from time to time hereafter; provided, however,
         that any partial  prepayment of the Third Additional Term Loan shall be
         applied  by  Lender  in the  inverse  order  of the  maturities  of the
         principal installments of the Third Additional Term Loan then remaining
         to be paid.

                           (b) The Third Additional Term Loan shall be repaid by
         Borrower in Cn.  Dollars.  If Borrower for any reason fails to make any
         payment of principal or interest on the Third  Additional  Term Loan in
         Cn.  Dollars,  or if Borrower  shall default in the payment when due of
         any payment on the Third  Additional  Term Loan, the Lender may, at its
         option,  require such payment to be made in the Dollars Equivalent.  In
         any such case,  Borrower  agrees to hold the Lender  harmless  from any
         loss  incurred by it arising from any change in the value of Dollars in
         relation to Cn.  Dollars  between the date such payment  became due and
         the date of payment thereof.

                           (c) If for the purpose of  obtaining  judgment in any
         court or  enforcing  any such  judgment it is  necessary to convert any
         amount  due in Cn.  Dollars  into  Dollars,  the Cn.  Dollars  shall be
         converted to the Dollar  Equivalent  on the Business Day  preceding the
         date on which  judgment is given or any order for payment is made.  The
         obligation  of the Borrower in respect of any amounts due from it under
         the Third Additional Term Loan shall,  notwithstanding  any judgment or
         order for a liquidated  sum or sums in respect of amounts due hereunder
         or any  judgment  or order  in any  other  currency  or  otherwise,  be
         discharged  only to the  extent  that on the day  following  receipt by
         Lender of any payment in a currency  other than Cn.  Dollars the Lender
         is able (in accordance  with normal banking  procedures) to purchase an
         amount of Cn.  Dollars  with such  other  currency  equal to the amount
         owed.  If the  amount  of the Cn.  Dollars  that the  Lender is able to
         purchase  with such other  currency  is less than the amount due in Cn.
         Dollars,  notwithstanding  any judgment or order,  the  Borrower  shall
         indemnify the Lender for the shortfall.

     (d) The Loan  Agreement is hereby amended by amending  Section  2.2.1(a) to
     read as follows:

                  (a) Initial Rate. The  outstanding  principal  balance of each
         Loan (other than the Third  Additional Term Loan), or each  outstanding
         portion  thereof,  shall bear  interest  initially  at a rate per annum
         equal to either:
          (i) the  Prime  Rate in the case of that  portion  of such Loan at any
         time  constituting a Prime  Borrowing or (ii) subject to the conditions
         and limitations set forth in subsection (c) below,  the LIBOR Rate plus
         the  Applicable  Margin in the case of that portion of such Loan at any
         time constituting a LIBOR Borrowing; subject, however, in each case, to
         adjustment  as  provided  in  subsection  (b)  below.  The  outstanding
         principal balance of the Third Additional Term Loan shall bear interest
         at a rate per annum equal to the LIBOR Rate plus the Applicable Margin,
         subject to adjustment as provided in subsection (b) below.

     (e) The Loan  Agreement is hereby amended by amending  Section  2.2.1(c) to
     read as follows:

                  (c)  Conditions  and  Limitations  on  LIBOR  Borrowings.  All
         Borrowings  obtained on the Closing  Date and for a period of three (3)
         Business  Days  thereafter  shall  be  Prime  Borrowings.   Thereafter,
         Borrower shall have the continuing right, provided that with respect to
         Borrowings  other  than  the  Third  Additional  Term  Loan no Event of
         Default or Default  Condition  exists,  to obtain  Borrowings which are
         LIBOR  Borrowings or to convert Prime  Borrowings to LIBOR  Borrowings;
         subject,  however,  to the following  conditions and  limitations:  (i)
         Borrower must request a LIBOR Borrowing,  specifying the amount thereof
         and the applicable Interest Period, at least three (3) Business Days in
         advance of the  intended  borrowing  date;  (ii) no more than three (3)
         LIBOR Borrowings under each of the Line of Credit, the Acquisition Term
         Loans and the Additional Term Loans may be obtained at any time;  (iii)
         LIBOR Borrowings (other than the Third Additional Term Loan) must be in
         minimum  amounts  of  Five  Hundred  Thousand  Dollars  ($500,000),  or
         integral  multiples  thereof,   (iv)  the  Interest  Period  for  LIBOR
         Borrowings  in  respect  of the Line of  Credit  shall not  exceed  the
         Termination  Date; (v) the Interest  Periods for, and aggregate  amount
         of, LIBOR  Borrowings  in respect of the  Acquisition  Term Loans,  the
         Additional  Term  Loans  or the  Third  Additional  Term  Loan  must be
         consistent with, and not exceed, the scheduled  principal  amortization
         thereof;  or (vi)  if on or  prior  to the  first  day of any  Interest
         Period, Lender determines that deposits in United States Dollars or Cn.
         Dollars  (in the  applicable  amounts)  are not  being  offered  in the
         relevant  market for such  Interest  Period or that the LIBOR Rate will
         not  adequately  and fairly  reflect  the cost to Lender of funding any
         relevant  borrowings  for such  Interest  Period,  then,  Lender  shall
         forthwith  give notice  thereof to  Borrower,  whereupon,  until Lender
         notifies Borrower that the circumstances giving rise to such suspension
         no longer  exist,  the  obligation  of Lender to make LIBOR  Borrowings
         available to Borrower  shall be suspended and with respect to the Third
         Additional Term Loan the Lender shall designate a substitute  index for
         calculation of the interest rate which  adequately and fairly  reflects
         the cost to Lender of funding and maintaining the Third Additional Term
         Loan;  (vii) if, at any time, a change of law, or  compliance by Lender
         with any request or directive  (whether or not having the force of law)
         of any  governmental  authority shall make it unlawful or impracticable
         for Lender to make  available,  maintain or fund any LIBOR  Borrowings,
         Lender  shall  forthwith  give  notice  to  such  effect  to  Borrower,
         whereupon, until Lender notifies Borrower that the circumstances giving
         rise to such  suspension no longer exist,  the  obligation of Lender to
         make such  Borrowings  available to Borrower  shall be suspended and if
         Lender shall  determine  that it may not lawfully  continue to maintain
         and fund any then  outstanding  Borrowings  to  maturity  and  shall so
         specify in such notice, each Borrowing, other than the Third Additional
         Term  Loan,  so  affected  shall  be  converted  to a  Prime  Borrowing
         effective immediately and the Third Additional Term Loan shall from the
         date  of  such  notice  bear  interest  at an rate  equal  to an  index
         designated  by the Lender plus the  Applicable  Margin;  (viii)  unless
         Borrower has timely given Lender a notice of LIBOR  Borrowing  required
         hereinabove,  a LIBOR Borrowing  (other than the Third  Additional Term
         Loan) shall automatically  convert to Prime Borrowing at the expiration
         of  the  Interest  Period  corresponding  thereto;  (ix)  no  voluntary
         prepayment of any LIBOR Borrowing shall be permitted  unless Lender has
         given its written consent thereto;  and (x) upon the request of Lender,
         delivered  to  Borrower,  Borrower  shall pay to Lender  such amount or
         amounts  as  shall be  determined  by  Lender  in  connection  with the
         relevant  Interest Period as a result of: (A) any payment or prepayment
         of any LIBOR Borrowing by Borrower on a date other than the last day of
         an Interest Period for such Borrowing, whether as a result of voluntary
         prepayment,   mandatory   prepayment,   involuntary   acceleration   or
         otherwise;  or (B) any failure by the  Borrower to  undertake  any such
         LIBOR  Borrowing  on the date for  which  notice of such  Borrowing  is
         specified  by  Borrower.  In the case of  clause  (x),  such sum  shall
         include, without limitation,  an amount equal to the excess, if any, of
         the amount of interest  which would have  accrued on the amount so paid
         or prepaid or not prepaid or  borrowed  for the period from the date of
         such payment, prepayment or failure to prepay or borrow to the last day
         of the then current Interest Period for such Borrowing (or, in the case
         of a  failure  to  prepay  or  borrow,  the  Interest  Period  for such
         Borrowing  which would have  commenced  on the date of such  failure to
         prepay or borrow) at the applicable rate of interest for such Borrowing
         provided  for herein  over the amount of  interest  (as  determined  by
         Lender in the reasonable  exercise of its discretion) Lender would have
         paid on deposits in United States Dollars of comparable  amounts having
         terms  comparable to such period placed with it by leading banks in the
         London interbank market.

     (f) The Loan  Agreement is hereby  amended by amending the last sentence of
     Section 2.4 to read as follows:

          "Any  prepayment  made by  Borrower  under this  Section  2.4 shall be
     applied,  first,  to prepay the scheduled  installments  of the Acquisition
     Term Loans in  inverse  order of  maturity  until such Loan shall have been
     prepaid  in full,  second,  to prepay  the  scheduled  installments  of the
     Additional  Term Loans in inverse  order of maturity  until such Loans have
     been prepaid in full and third to prepay the scheduled  installments of the
     Third  Additional  Term Loan in inverse order of maturity  until Loans have
     been prepaid in full."

2. No Other Amendments. Except for the amendments expressly set forth and
referred to in Sections 1 above, the Loan Agreement shall remain unchanged
and in full force and effect. Nothing in this Third Modification is
intended, or shall be construed, to constitute a novation or an accord and
satisfaction of any of the Borrower's indebtedness or other indebtedness to
the Lender under or in connection with the Loan Agreement (collectively,
the "Obligations") or to modify, affect or impair the perfection or
continuity of Lender's security interests in, security titles to or other
liens on any collateral for the Obligations.

3. Representations and Warranties. To induce Lender to enter
into this Third Modification, the Borrower does hereby warrant, represent and
covenant to Lender that: (a) each representation or warranty of the Borrower set
forth in the Loan Agreement is hereby restated and reaffirmed as true and
correct on and as of the date hereof as if such representation or warranty were
made on and as of the date hereof (except to the extent that any such
representation or warranty expressly relates to a prior specific date or
period), and no Default or Event of Default has occurred and is continuing as of
this date under the Loan Agreement as amended by this Third Modification; and
(b) Borrower has the power and is duly authorized to enter into, deliver and
perform this Third Modification and this Third Modification is the legal, valid
and binding obligation of Borrower enforceable against it in accordance with its
terms.

4. Conditions Precedent to Effectiveness of this Third
Modification. The effectiveness of this Third Modification and the amendments
provided herein are subject to the truth and accuracy in all material respects
of the representations and warranties of the Borrower contained in Section 3
above and to the fulfillment of the following additional conditions precedent:
(a) Lender shall have received one or more counterparts of this Third
Modification duly executed and delivered by the Borrower; (b) if and to the
extent required by Lender, any and all guarantors of the Obligations shall have
consented to the execution, delivery and performance of this Third Modification
and all of the transactions contemplated hereby by signing one or more
counterparts of this Third Modification in the appropriate space indicated below
and returning same to Lender; (c) Lender shall have received the Third
Additional Term Note, dated as of the date of this Third Modification and having
a stated principal amount equal to Cn.$5,741.000, duly executed and delivered,
as well as a closing certificate of Borrower and an opinion of Borrower's
counsel (both in form and substance satisfactory to Lender) with respect to this
Third Modification and the Third Additional Term Note.

5. Counterparts. This Third Modification may be executed in multiple
counterparts, each of which shall be deemed to be an original and all of
which when taken together shall constitute one and the same instrument.

6. Governing Law. This Third Modification shall be governed by, and
construed in accordance with, the internal laws of the State of Georgia
applicable to contracts made and performed in such state.

<PAGE>



                  IN WITNESS WHEREOF,  the parties hereto have caused this Third
Modification  to be duly executed and delivered as of the day and year specified
at the beginning hereof.

                                     BORROWER:

                                     IMMUCOR, INC.


                                     By: /s/  Edward L. Gallup
                                     Edward L. Gallup, President


                                     LENDER:

                                     WACHOVIA BANK, N.A.


                                     By:      /s/  Ernesto Moran
                                     Title:   President



<PAGE>



                                     CONSENT OF GUARANTORS


                  Each of the undersigned  guarantors does hereby consent to the
execution,   delivery  and   performance  of  the  within  and  foregoing  Third
Modification of Loan Agreement.

                  IN WITNESS  WHEREOF,  each of the  undersigned  guarantors has
executed this Consent under seal as of the day and year first above set forth.


                            GAMMA BIOLOGICALS, INC.



                            By: /s/ Edward L. Gallup
                            Edward L. Gallup, President


                            GAMMA BIOLOGICALS INTERNATIONAL, INC.


                            By: /s/ Edward L. Gallup
                            Edward L. Gallup, President


                            BCA ACQUISITION CORPORATION


                            By: /s/ Edward L. Gallup
                            Edward L. Gallup, President