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        <TotalCompensationRltdOrgsAmt>868161</TotalCompensationRltdOrgsAmt>
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        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
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        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
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        <TotalCompensationRltdOrgsAmt>1138363</TotalCompensationRltdOrgsAmt>
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        <PersonNm>PENNY HEATON</PersonNm>
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        <PersonNm>SALLY JENNINGS</PersonNm>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>JEFF BARRETT</PersonNm>
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        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
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        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>DINA BERDIEVA</PersonNm>
        <TitleTxt>HEAD OF PROJ. MGMT. &amp; CLINICAL OPS</TitleTxt>
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        <PersonNm>DAVID KAUFMAN</PersonNm>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>MARY THISTLE</PersonNm>
        <TitleTxt>CHIEF OF STAFF</TitleTxt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>DEBRA WEISS</PersonNm>
        <TitleTxt>HEAD OF QUALITY ASSURANCE</TitleTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 1A</FormAndLineReferenceDesc>
        <ExplanationTxt>THE TRAVEL POLICY, APPLICABLE TO ALL EMPLOYEES, ALLOWS FOR FIRST-CLASS AIR TRAVEL ON DOMESTIC RED-EYE FLIGHTS DEPARTING AFTER 9:00 PM THAT EXCEED FIVE HOURS IN DURATION. RELOCATION PACKAGES ARE GENERALLY PROVIDED TO NEW EMPLOYEES WHO RESIDE MORE THAN 50 MILES OUTSIDE OF CAMBRIDGE, MASSACHUSSETTS. THE ORGANIZATION GROSSES UP TAXABLE RELOCATION BENEFITS.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 2</FormAndLineReferenceDesc>
        <ExplanationTxt>SUSAN DESMOND-HELLMANN, TREVOR MUNDEL, ANDREW FARNUM, EMILIO EMINI, AND HELENE MADONICK HAVE A BUSINESS RELATIONSHIP AS EMPLOYEES OF THE BILL &amp; MELINDA GATES FOUNDATION. JIM BROMLEY, FORMER OFFICER, HAD A BUSINESS RELATIONSHIP AS AN EMPLOYEE OF THE BILL &amp; MELINDA GATES FOUNDATION DURING THE 2018 TAX YEAR.</ExplanationTxt>
      </SupplementalInformationDetail>
      <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>
      </SupplementalInformationDetail>
      <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>
      </SupplementalInformationDetail>
      <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>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FORM 990 IS PREPARED BY A THIRD-PARTY ACCOUNTANT. AFTER PREPARATION, IT IS REVIEWED IN DETAIL BY CHIEF OF STAFF 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 PRIOR TO FILING WITH THE INTERNAL REVENUE SERVICE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <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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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION DETERMINES COMPENSATION FOR ITS CHIEF EXECUTIVE OFFICER, OTHER OFFICERS, AND KEY EMPLOYEES BASED ON A COMPENSATION STUDY. THE BOARD IS PRESENTED WITH STUDY DATA, REVIEWS IT TO DETERMINE REASONABLE COMPENSATION AND THEN APPROVES COMPENSATION FOR THESE INDIVIDUALS ACCORDINGLY. BILL &amp; MELINDA GATES FOUNDATION, THE SOLE MEMBER OF BILL &amp; MELINDA GATES MEDICAL RESEARCH INSTITUTE, CONDUCTED THE INITIAL COMPENSATION REVIEWS IN 2017, INCLUDING THE COMPENSATION PACKAGE FOR THE CHIEF EXECUTIVE OFFICER. IN 2018, COMPENSATION FOR ALL OFFICERS AND KEY EMPLOYEES WAS REVISITED BY THE BILL &amp; MELINDA GATES MEDICAL RESEARCH INSTITUTE BOARD AND DEEMED REASONABLE AND APPROPRIATE BASED ON STUDY DATA.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <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>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 9</FormAndLineReferenceDesc>
        <ExplanationTxt>ANY OFFICER, DIRECTOR, TRUSTEE, OR KEY EMPLOYEE THAT IS AN EMPLOYEE OF THE BILL &amp; MELINDA GATES FOUNDATION CAN BE REACHED AT THE FOLLOWING ADDRESS. FOR 2018, THIS INCLUDES SUSAN DESMOND-HELLMANN, JIM BROMLEY, TREVOR MUNDEL, EMILIO EMINI, HELENE MADONICK AND ANDREW FARNUM: P.O. BOX 23350 SEATTLE, WA 98102</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VII, SECTION B, LINE 1</FormAndLineReferenceDesc>
        <ExplanationTxt>WEBSITE DEVELOPMENT AND COMMUNICATION PLATFORM DEVELOPMENT EXPENSES PAID TO WAGGENER EDSTROM WORLDWIDE, INC. AND STRAIGHTLINE INTERNATIONAL, INC. ARE RELATED TO START-UP EXPENDITURES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART IX, LINE 11G</FormAndLineReferenceDesc>
        <ExplanationTxt>OTHER FEES FOR SERVICES: PROGRAM SERVICE EXPENSES 136,386. MANAGEMENT AND GENERAL EXPENSES 0. FUNDRAISING EXPENSES 0. TOTAL EXPENSES 136,386. SCIENTIFIC CONSULTING AND TECHNICAL ASSISTANCE: PROGRAM SERVICE EXPENSES 862,004. MANAGEMENT AND GENERAL EXPENSES 0. FUNDRAISING EXPENSES 0. TOTAL EXPENSES 862,004. RECRUITING AND PUBLIC RELATIONS: PROGRAM SERVICE EXPENSES 1,857,606. MANAGEMENT AND GENERAL EXPENSES 292,727. FUNDRAISING EXPENSES 0. TOTAL EXPENSES 2,150,333. OPERATIONAL ASSISTANCE: PROGRAM SERVICE EXPENSES 551,377. MANAGEMENT AND GENERAL EXPENSES 468,317. FUNDRAISING EXPENSES 0. TOTAL EXPENSES 1,019,694.</ExplanationTxt>
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          <BusinessNameLine1Txt>GREENBRIAR EQUITY FUND II-A LP</BusinessNameLine1Txt>
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      <IdRelatedOrgTxblPartnershipGrp>
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          <BusinessNameLine1Txt>GREENBRIAR EQUITY FUND III AIV MM NV LP</BusinessNameLine1Txt>
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      <IdRelatedOrgTxblPartnershipGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>GREENBRIAR EQUITY FUND III AIV SK NV LP</BusinessNameLine1Txt>
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          <AddressLine1Txt>555 THEODORE FREMD AVE STE A-201</AddressLine1Txt>
          <CityNm>RYE</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
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      <IdRelatedOrgTxblPartnershipGrp>
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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>
          <CityNm>RYE</CityNm>
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        <RelatedOrganizationName>
          <BusinessNameLine1Txt>GREENBRIAR EQUITY FUND III-A LP</BusinessNameLine1Txt>
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          <AddressLine1Txt>555 THEODORE FREMD AVE STE A-201</AddressLine1Txt>
          <CityNm>RYE</CityNm>
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      <IdRelatedOrgTxblPartnershipGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>THE GLOBAL GOOD FUND I LLC</BusinessNameLine1Txt>
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        <USAddress>
          <AddressLine1Txt>3150 139TH AVE SE</AddressLine1Txt>
          <CityNm>BELLEVUE</CityNm>
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          <AddressLine1Txt>6TH FLOOR TOWER A 1 CYBERCITY</AddressLine1Txt>
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        <EntityTypeTxt>C</EntityTypeTxt>
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        <RelatedOrganizationName>
          <BusinessNameLine1Txt>JOINT FUND SPV 1 LLC</BusinessNameLine1Txt>
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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>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <EntityTypeTxt>C</EntityTypeTxt>
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      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>JOINT FUND SPV 2 LLC</BusinessNameLine1Txt>
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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>
        <PrimaryActivitiesTxt>PROGRAM RELATED INVESTMENT OF BMGF</PrimaryActivitiesTxt>
        <LegalDomicileForeignCountryCd>CJ</LegalDomicileForeignCountryCd>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <EntityTypeTxt>C</EntityTypeTxt>
        <ControlledOrganizationInd>1</ControlledOrganizationInd>
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      <ReceiptOfIntAnntsRntsRyltsInd>0</ReceiptOfIntAnntsRntsRyltsInd>
      <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>1</ReimbursementPaidToOtherOrgInd>
      <ReimbursementPaidByOtherOrgInd>0</ReimbursementPaidByOtherOrgInd>
      <TransferToOtherOrgInd>0</TransferToOtherOrgInd>
      <TransferFromOtherOrgInd>0</TransferFromOtherOrgInd>
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  </ReturnData>
</Return>