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        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 2</FormAndLineReferenceDesc>
        <ExplanationTxt>SUSAN DESMOND-HELLMANN, TREVOR MUNDEL, JIM BROMLEY, EMILIO EMINI, HELENE MADONICK, AND PENNY HEATON HAVE A BUSINESS RELATIONSHIP AS EMPLOYEES OF THE BILL &amp; MELINDA GATES FOUNDATION.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>THE SOLE MEMBER OF BILL &amp; MELINDA GATES MEDICAL RESEARCH INSTITUTE IS BILL &amp; MELINDA GATES FOUNDATION.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>BILL &amp; MELINDA GATES FOUNDATION, THE SOLE MEMBER OF BILL &amp; MELINDA GATES MEDICAL RESEARCH INSTITUTE, HAS THE AUTHORITY TO APPOINT AND REMOVE DIRECTORS.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7B</FormAndLineReferenceDesc>
        <ExplanationTxt>BILL &amp; MELINDA GATES FOUNDATION, THE SOLE MEMBER OF BILL &amp; MELINDA GATES MEDICAL RESEARCH INSTITUTE, HAS THE AUTHORITY TO AMEND THE ARTICLES OF INCORPORATION, ADOPT A PLAN OF MERGER OR CONSOLIDATION, AUTHORIZE THE SALE, LEASE, OR EXCHANGE OF ALL OR SUBSTANTIALLY ALL OF THE ASSETS OF THE ORGANIZATION, AUTHORIZE THE VOLUNTARY DISSOLUTION OF THE ORGANIZATION AND ADOPTION OF A PLAN FOR THE DISTRIBUTION OF THE ASSETS OF THE ORGANIZATION.</ExplanationTxt>
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        <ExplanationTxt>THE FORM 990 IS PREPARED BY A THIRD-PARTY ACCOUNTANT. AFTER PREPARATION, IT IS REVIEWED IN DETAIL BY THE CHIEF OPERATING OFFICER OF THE INSTITUTE, AND THE TAX TEAM AND CONTROLLER OF BILL &amp; MELINDA GATES FOUNDATION, THE SOLE MEMBER OF BILL &amp; MELINDA GATES MEDICAL RESEARCH INSTITUTE. A COPY OF THE FORM 990 IS PROVIDED TO THE ENTIRE BOARD OF THE INSTITUTE PRIOR TO FILING WITH THE INTERNAL REVENUE SERVICE.</ExplanationTxt>
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        <ExplanationTxt>ALL OFFICERS, DIRECTORS AND KEY EMPLOYEES ARE CONSIDERED "COVERED PERSONS" FOR THE ORGANIZATION'S CONFLICT OF INTEREST POLICY, AND AS SUCH, ARE REQUIRED TO ANNUALLY DISCLOSE ANY RELATIONSHIPS THAT COULD GIVE RISE TO CONFLICTS OF INTEREST INVOLVING THE ORGANIZATION. IN ADDITION, ANY TRANSACTIONS BETWEEN THE ORGANIZATION AND ANY OF THESE INDIVIDUALS (OR THEIR FAMILY MEMBERS OR AN AFFILIATED ENTITY) MUST BE DISCLOSED TO THE SECRETARY. IF THE SECRETARY HAS A POTENTIAL CONFLICT OF INTEREST, IT MUST BE DISCLOSED TO THE CHIEF EXECUTIVE OFFICER. THE SECRETARY AND CHIEF EXECUTIVE OFFICER ARE RESPONSIBLE FOR REVIEWING THE ANNUAL CONFLICT OF INTEREST DISCLOSURES AND RESOLVING ANY POTENTIAL CONFLICT OF INTERESTS THAT MAY ARISE. THE COVERED PERSON IS REQUIRED TO REFRAIN FROM USING HIS OR HER PERSONAL INFLUENCE TO ENCOURAGE THE ORGANIZATION TO ENTER INTO THE COVERED TRANSACTION. ADDITIONALLY, HE OR SHE MUST NOT PARTICIPATE IN ANY DISCUSSIONS REGARDING THE COVERED TRANSACTIONS WITH OFFICERS, DIRECTORS AND EMPLOYEES OF THE ORGANIZATION, EXCEPT TO RESPOND TO REQUESTS FOR INFORMATION. IF THE TRANSACTION IS DEEMED TO BE REASONABLE BY THE DISINTERESTED DIRECTORS (IN THE CASE OF A CONFLICT INVOLVING A DIRECTOR OR THE CHIEF EXECUTIVE OFFICER) OR CHIEF EXECUTIVE OFFICER (IN THE CASE OF A CONFLICT INVOLVING ANOTHER OFFICER OR KEY EMPLOYEE), THE ORGANIZATION MAY ENTER INTO THE TRANSACTION, AS LONG AS IT IS FAIR AND REASONABLE TO THE ORGANIZATION.</ExplanationTxt>
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        <ExplanationTxt>DURING 2017, BILL &amp; MELINDA GATES MEDICAL RESEARCH INSTITUTE DID NOT COMPENSATE ITS CHIEF EXECUTIVE OFFICER, OTHER OFFICERS OR KEY EMPLOYEES. THE ORGANIZATION HAD NO EMPLOYEES AND THE OFFICERS WERE COMPENSATED BY BILL &amp; MELINDA GATES FOUNDATION, THE SOLE MEMBER OF BILL &amp; MELINDA GATES MEDICAL RESEARCH INSTITUTE. BILL &amp; MELINDA GATES FOUNDATION HAS A PROCESS TO DETERMINE COMPENSATION WHICH INCLUDES APPROVAL BY INDEPENDENT PERSONS, COMPARABILITY DATA, AND CONTEMPORANEOUS DOCUMENTATION. BILL &amp; MELINDA GATES MEDICAL RESEARCH INSTITUTE CONDUCTED A COMPENSATION STUDY IN 2017 TO PREPARE FOR THE HIRING OF EMPLOYEES ON JANUARY 1, 2018.</ExplanationTxt>
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        <ExplanationTxt>THE ORGANIZATION'S GOVERNING DOCUMENTS AND CONFLICT OF INTEREST POLICY ARE AVAILABLE UPON REQUEST. BILL &amp; MELINDA GATES MEDICAL RESEARCH INSTITUTE'S FINANCIAL STATEMENTS ARE CONSOLIDATED WITH BILL &amp; MELINDA GATES FOUNDATION, AND THE CONSOLIDATED FINANCIAL STATEMENTS ARE AVAILABLE AT WWW.GATESFOUNDATION.ORG.</ExplanationTxt>
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      <IdRelatedOrgTxblPartnershipGrp>
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          <BusinessNameLine1Txt>GREENBRIAR EQUITY FUND III AIV SK NV LP</BusinessNameLine1Txt>
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          <AddressLine1Txt>555 THEODORE FREMD AVE STE A-201</AddressLine1Txt>
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          <BusinessNameLine1Txt>GREENBRIAR EQUITY FUND III-A AIV WFCI LP</BusinessNameLine1Txt>
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          <AddressLine1Txt>555 THEODORE FREMD AVE STE A-201</AddressLine1Txt>
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          <BusinessNameLine1Txt>GREENBRIAR EQUITY FUND III-A LP</BusinessNameLine1Txt>
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          <AddressLine1Txt>555 THEODORE FREMD AVE STE A-201</AddressLine1Txt>
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        <RelatedOrganizationName>
          <BusinessNameLine1Txt>THE GLOBAL GOOD FUND I LLC</BusinessNameLine1Txt>
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        <USAddress>
          <AddressLine1Txt>3150 139TH AVE SE</AddressLine1Txt>
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          <AddressLine1Txt>6TH FLOOR TOWER A 1 CYBERCITY</AddressLine1Txt>
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        <RelatedOrganizationName>
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        <ForeignAddress>
          <AddressLine1Txt>PO BOX 10008 WILLOW HOUSE CRICK</AddressLine1Txt>
          <CityNm>GRAND CAYMAN</CityNm>
          <CountryCd>CJ</CountryCd>
          <ForeignPostalCd>KY1-1001</ForeignPostalCd>
        </ForeignAddress>
        <EIN>981434108</EIN>
        <PrimaryActivitiesTxt>PROGRAM RELATED INVESTMENT OF BMGF</PrimaryActivitiesTxt>
        <LegalDomicileForeignCountryCd>CJ</LegalDomicileForeignCountryCd>
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        <RelatedOrganizationName>
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        <ForeignAddress>
          <AddressLine1Txt>PO BOX 10008 WILLOW HOUSE CRICK</AddressLine1Txt>
          <CityNm>GRAND CAYMAN</CityNm>
          <CountryCd>CJ</CountryCd>
          <ForeignPostalCd>KY1-1001</ForeignPostalCd>
        </ForeignAddress>
        <EIN>981434482</EIN>
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        <LegalDomicileForeignCountryCd>CJ</LegalDomicileForeignCountryCd>
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        <EntityTypeTxt>C</EntityTypeTxt>
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      <GiftGrntOrCapContriToOthOrgInd>0</GiftGrntOrCapContriToOthOrgInd>
      <GiftGrntCapContriFromOthOrgInd>1</GiftGrntCapContriFromOthOrgInd>
      <LoansOrGuaranteesToOtherOrgInd>0</LoansOrGuaranteesToOtherOrgInd>
      <LoansOrGuaranteesFromOthOrgInd>0</LoansOrGuaranteesFromOthOrgInd>
      <DivRelatedOrganizationInd>0</DivRelatedOrganizationInd>
      <AssetSaleToOtherOrgInd>0</AssetSaleToOtherOrgInd>
      <AssetPurchaseFromOtherOrgInd>0</AssetPurchaseFromOtherOrgInd>
      <AssetExchangeInd>0</AssetExchangeInd>
      <RentalOfFacilitiesToOthOrgInd>0</RentalOfFacilitiesToOthOrgInd>
      <RentalOfFcltsFromOthOrgInd>0</RentalOfFcltsFromOthOrgInd>
      <PerformOfServicesForOthOrgInd>0</PerformOfServicesForOthOrgInd>
      <PerformOfServicesByOtherOrgInd>1</PerformOfServicesByOtherOrgInd>
      <SharingOfFacilitiesInd>1</SharingOfFacilitiesInd>
      <PaidEmployeesSharingInd>1</PaidEmployeesSharingInd>
      <ReimbursementPaidToOtherOrgInd>0</ReimbursementPaidToOtherOrgInd>
      <ReimbursementPaidByOtherOrgInd>1</ReimbursementPaidByOtherOrgInd>
      <TransferToOtherOrgInd>0</TransferToOtherOrgInd>
      <TransferFromOtherOrgInd>0</TransferFromOtherOrgInd>
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  </ReturnData>
</Return>