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    <link:loc xlink:href="siga-20120930.xsd#siga_ProcurementContractLineItems" xlink:label="loc_siga_ProcurementContractLineItems_9BB4E69BC33DCAD8948DC21B515F80D1" xlink:type="locator" />
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    <link:label id="lab_siga_NumberOfCoursesToBeDelivered_F3A48E7D9652068D9149C21B515FA568_terseLabel_en-US" xlink:label="lab_siga_NumberOfCoursesToBeDelivered_F3A48E7D9652068D9149C21B515FA568" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of courses to be delivered</link:label>
    <link:label id="lab_siga_NumberOfCoursesToBeDelivered_F3A48E7D9652068D9149C21B515FA568_label_en-US" xlink:label="lab_siga_NumberOfCoursesToBeDelivered_F3A48E7D9652068D9149C21B515FA568" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number of Courses To Be Delivered</link:label>
    <link:label id="lab_siga_NumberOfCoursesToBeDelivered_F3A48E7D9652068D9149C21B515FA568_documentation_en-US" xlink:label="lab_siga_NumberOfCoursesToBeDelivered_F3A48E7D9652068D9149C21B515FA568" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Number of ST-246 courses to be delivered to the U.S. Strategic National Stockpile</link:label>
    <link:loc xlink:href="siga-20120930.xsd#siga_NumberOfCoursesToBeDelivered" xlink:label="loc_siga_NumberOfCoursesToBeDelivered_F3A48E7D9652068D9149C21B515FA568" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_siga_NumberOfCoursesToBeDelivered_F3A48E7D9652068D9149C21B515FA568" xlink:to="lab_siga_NumberOfCoursesToBeDelivered_F3A48E7D9652068D9149C21B515FA568" xlink:type="arc" />
    <link:label id="lab_siga_BaseGovernmentContractDuration_1F7E49EC46C29A35696DC21B515FD1E7_terseLabel_en-US" xlink:label="lab_siga_BaseGovernmentContractDuration_1F7E49EC46C29A35696DC21B515FD1E7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Government contract, duration</link:label>
    <link:label id="lab_siga_BaseGovernmentContractDuration_1F7E49EC46C29A35696DC21B515FD1E7_label_en-US" xlink:label="lab_siga_BaseGovernmentContractDuration_1F7E49EC46C29A35696DC21B515FD1E7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Base Government Contract, Duration</link:label>
    <link:label id="lab_siga_BaseGovernmentContractDuration_1F7E49EC46C29A35696DC21B515FD1E7_documentation_en-US" xlink:label="lab_siga_BaseGovernmentContractDuration_1F7E49EC46C29A35696DC21B515FD1E7" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Base Government Contract, Duration</link:label>
    <link:loc xlink:href="siga-20120930.xsd#siga_BaseGovernmentContractDuration" xlink:label="loc_siga_BaseGovernmentContractDuration_1F7E49EC46C29A35696DC21B515FD1E7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_siga_BaseGovernmentContractDuration_1F7E49EC46C29A35696DC21B515FD1E7" xlink:to="lab_siga_BaseGovernmentContractDuration_1F7E49EC46C29A35696DC21B515FD1E7" xlink:type="arc" />
    <link:label id="lab_siga_GovernmentContractValueOfAward_010E48812E1B28FF5EDDC21B515F58D0_terseLabel_en-US" xlink:label="lab_siga_GovernmentContractValueOfAward_010E48812E1B28FF5EDDC21B515F58D0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Value of contract</link:label>
    <link:label id="lab_siga_GovernmentContractValueOfAward_010E48812E1B28FF5EDDC21B515F58D0_label_en-US" xlink:label="lab_siga_GovernmentContractValueOfAward_010E48812E1B28FF5EDDC21B515F58D0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Government Contract, Value of Award</link:label>
    <link:label id="lab_siga_GovernmentContractValueOfAward_010E48812E1B28FF5EDDC21B515F58D0_documentation_en-US" xlink:label="lab_siga_GovernmentContractValueOfAward_010E48812E1B28FF5EDDC21B515F58D0" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Value of five-year base contract award</link:label>
    <link:loc xlink:href="siga-20120930.xsd#siga_GovernmentContractValueOfAward" xlink:label="loc_siga_GovernmentContractValueOfAward_010E48812E1B28FF5EDDC21B515F58D0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_siga_GovernmentContractValueOfAward_010E48812E1B28FF5EDDC21B515F58D0" xlink:to="lab_siga_GovernmentContractValueOfAward_010E48812E1B28FF5EDDC21B515F58D0" xlink:type="arc" />
    <link:label id="lab_siga_GovernmentContractMaximumNumberOfAdditionalCoursesAvailableToPurchase_59C592F2C3BBF82A0272C21B515F3A33_terseLabel_en-US" xlink:label="lab_siga_GovernmentContractMaximumNumberOfAdditionalCoursesAvailableToPurchase_59C592F2C3BBF82A0272C21B515F3A33" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Option to purchase additional courses</link:label>
    <link:label id="lab_siga_GovernmentContractMaximumNumberOfAdditionalCoursesAvailableToPurchase_59C592F2C3BBF82A0272C21B515F3A33_label_en-US" xlink:label="lab_siga_GovernmentContractMaximumNumberOfAdditionalCoursesAvailableToPurchase_59C592F2C3BBF82A0272C21B515F3A33" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Government Contract, Maximum Number of Additional Courses Available to Purchase</link:label>
    <link:label id="lab_siga_GovernmentContractMaximumNumberOfAdditionalCoursesAvailableToPurchase_59C592F2C3BBF82A0272C21B515F3A33_documentation_en-US" xlink:label="lab_siga_GovernmentContractMaximumNumberOfAdditionalCoursesAvailableToPurchase_59C592F2C3BBF82A0272C21B515F3A33" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Government contract, maximum number of additional courses available to purchase by the U.S. government, subsequently withdrawn from final contract.</link:label>
    <link:loc xlink:href="siga-20120930.xsd#siga_GovernmentContractMaximumNumberOfAdditionalCoursesAvailableToPurchase" xlink:label="loc_siga_GovernmentContractMaximumNumberOfAdditionalCoursesAvailableToPurchase_59C592F2C3BBF82A0272C21B515F3A33" xlink:type="locator" />
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    <link:label id="lab_siga_GovernmentContractNumberOfCoursesPurchasedUnderModifiedContract_87831FFDDA2DBF485EB2C21B515F3EA8_terseLabel_en-US" xlink:label="lab_siga_GovernmentContractNumberOfCoursesPurchasedUnderModifiedContract_87831FFDDA2DBF485EB2C21B515F3EA8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of courses under modified contract</link:label>
    <link:label id="lab_siga_GovernmentContractNumberOfCoursesPurchasedUnderModifiedContract_87831FFDDA2DBF485EB2C21B515F3EA8_label_en-US" xlink:label="lab_siga_GovernmentContractNumberOfCoursesPurchasedUnderModifiedContract_87831FFDDA2DBF485EB2C21B515F3EA8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Government Contract, Number of Courses Purchased Under Modified Contract</link:label>
    <link:label id="lab_siga_GovernmentContractNumberOfCoursesPurchasedUnderModifiedContract_87831FFDDA2DBF485EB2C21B515F3EA8_documentation_en-US" xlink:label="lab_siga_GovernmentContractNumberOfCoursesPurchasedUnderModifiedContract_87831FFDDA2DBF485EB2C21B515F3EA8" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Government contract, number of courses to be purchased under modified contract.</link:label>
    <link:loc xlink:href="siga-20120930.xsd#siga_GovernmentContractNumberOfCoursesPurchasedUnderModifiedContract" xlink:label="loc_siga_GovernmentContractNumberOfCoursesPurchasedUnderModifiedContract_87831FFDDA2DBF485EB2C21B515F3EA8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_siga_GovernmentContractNumberOfCoursesPurchasedUnderModifiedContract_87831FFDDA2DBF485EB2C21B515F3EA8" xlink:to="lab_siga_GovernmentContractNumberOfCoursesPurchasedUnderModifiedContract_87831FFDDA2DBF485EB2C21B515F3EA8" xlink:type="arc" />
    <link:label id="lab_siga_GovernmentContractNumberOfCoursesManufacturedUsingFederalFunds_1252CBE2CB046BC1A862C21B515F3EE4_terseLabel_en-US" xlink:label="lab_siga_GovernmentContractNumberOfCoursesManufacturedUsingFederalFunds_1252CBE2CB046BC1A862C21B515F3EE4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of courses manufactured using federal funds</link:label>
    <link:label id="lab_siga_GovernmentContractNumberOfCoursesManufacturedUsingFederalFunds_1252CBE2CB046BC1A862C21B515F3EE4_label_en-US" xlink:label="lab_siga_GovernmentContractNumberOfCoursesManufacturedUsingFederalFunds_1252CBE2CB046BC1A862C21B515F3EE4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Government Contract, Number of Courses Manufactured Using Federal Funds</link:label>
    <link:label id="lab_siga_GovernmentContractNumberOfCoursesManufacturedUsingFederalFunds_1252CBE2CB046BC1A862C21B515F3EE4_documentation_en-US" xlink:label="lab_siga_GovernmentContractNumberOfCoursesManufacturedUsingFederalFunds_1252CBE2CB046BC1A862C21B515F3EE4" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Government contract, number of courses to be delivered that were manufactured using federal funds under prior development contracts.</link:label>
    <link:loc xlink:href="siga-20120930.xsd#siga_GovernmentContractNumberOfCoursesManufacturedUsingFederalFunds" xlink:label="loc_siga_GovernmentContractNumberOfCoursesManufacturedUsingFederalFunds_1252CBE2CB046BC1A862C21B515F3EE4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_siga_GovernmentContractNumberOfCoursesManufacturedUsingFederalFunds_1252CBE2CB046BC1A862C21B515F3EE4" xlink:to="lab_siga_GovernmentContractNumberOfCoursesManufacturedUsingFederalFunds_1252CBE2CB046BC1A862C21B515F3EE4" xlink:type="arc" />
    <link:label id="lab_siga_ProceedsFromAdvancePaymentsGovernmentContracts_A2C53B1729644B8D5CCDC21B515F5A8F_terseLabel_en-US" xlink:label="lab_siga_ProceedsFromAdvancePaymentsGovernmentContracts_A2C53B1729644B8D5CCDC21B515F5A8F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from advance payments under the BARDA contract</link:label>
    <link:label id="lab_siga_ProceedsFromAdvancePaymentsGovernmentContracts_A2C53B1729644B8D5CCDC21B515F5A8F_label_en-US" xlink:label="lab_siga_ProceedsFromAdvancePaymentsGovernmentContracts_A2C53B1729644B8D5CCDC21B515F5A8F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from Advance Payments, Government Contracts</link:label>
    <link:label id="lab_siga_ProceedsFromAdvancePaymentsGovernmentContracts_A2C53B1729644B8D5CCDC21B515F5A8F_documentation_en-US" xlink:label="lab_siga_ProceedsFromAdvancePaymentsGovernmentContracts_A2C53B1729644B8D5CCDC21B515F5A8F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Proceeds from Advance Payments, Government Contracts</link:label>
    <link:loc xlink:href="siga-20120930.xsd#siga_ProceedsFromAdvancePaymentsGovernmentContracts" xlink:label="loc_siga_ProceedsFromAdvancePaymentsGovernmentContracts_A2C53B1729644B8D5CCDC21B515F5A8F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_siga_ProceedsFromAdvancePaymentsGovernmentContracts_A2C53B1729644B8D5CCDC21B515F5A8F" xlink:to="lab_siga_ProceedsFromAdvancePaymentsGovernmentContracts_A2C53B1729644B8D5CCDC21B515F5A8F" xlink:type="arc" />
    <link:label id="lab_us-gaap_DeferredCosts_70DB44945C4781213995C21B515F15E6_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredCosts_70DB44945C4781213995C21B515F15E6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Deferred costs</link:label>
    <link:label id="lab_us-gaap_DeferredCosts_70DB44945C4781213995C21B515F15E6_label_en-US" xlink:label="lab_us-gaap_DeferredCosts_70DB44945C4781213995C21B515F15E6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Costs, Noncurrent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DeferredCosts" xlink:label="loc_us-gaap_DeferredCosts_70DB44945C4781213995C21B515F15E6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredCosts_70DB44945C4781213995C21B515F15E6" xlink:to="lab_us-gaap_DeferredCosts_70DB44945C4781213995C21B515F15E6" xlink:type="arc" />
    <link:label id="lab_us-gaap_DeferredRevenueAdditions_638EFF7BAFCA0D5C709CC21B515FC82C_verboseLabel_en-US" xlink:label="lab_us-gaap_DeferredRevenueAdditions_638EFF7BAFCA0D5C709CC21B515FC82C" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Deferred revenue, additions from BARDA contract</link:label>
    <link:label id="lab_us-gaap_DeferredRevenueAdditions_638EFF7BAFCA0D5C709CC21B515FC82C_label_en-US" xlink:label="lab_us-gaap_DeferredRevenueAdditions_638EFF7BAFCA0D5C709CC21B515FC82C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Revenue, Additions</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DeferredRevenueAdditions" xlink:label="loc_us-gaap_DeferredRevenueAdditions_638EFF7BAFCA0D5C709CC21B515FC82C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredRevenueAdditions_638EFF7BAFCA0D5C709CC21B515FC82C" xlink:to="lab_us-gaap_DeferredRevenueAdditions_638EFF7BAFCA0D5C709CC21B515FC82C" xlink:type="arc" />
    <link:label id="lab_siga_MilestonePayment_F82D8A85CCEA9987709AC21B515FA485_terseLabel_en-US" xlink:label="lab_siga_MilestonePayment_F82D8A85CCEA9987709AC21B515FA485" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Milestone payment</link:label>
    <link:label id="lab_siga_MilestonePayment_F82D8A85CCEA9987709AC21B515FA485_label_en-US" xlink:label="lab_siga_MilestonePayment_F82D8A85CCEA9987709AC21B515FA485" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Milestone payment</link:label>
    <link:label id="lab_siga_MilestonePayment_F82D8A85CCEA9987709AC21B515FA485_documentation_en-US" xlink:label="lab_siga_MilestonePayment_F82D8A85CCEA9987709AC21B515FA485" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Proceeds from milestone payment, Government contracts</link:label>
    <link:loc xlink:href="siga-20120930.xsd#siga_MilestonePayment" xlink:label="loc_siga_MilestonePayment_F82D8A85CCEA9987709AC21B515FA485" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_siga_MilestonePayment_F82D8A85CCEA9987709AC21B515FA485" xlink:to="lab_siga_MilestonePayment_F82D8A85CCEA9987709AC21B515FA485" xlink:type="arc" />
    <link:label id="lab_siga_GovernmentContractNumberOfActiveGrants_EA4602B5D38440169F20C21B515F8193_terseLabel_en-US" xlink:label="lab_siga_GovernmentContractNumberOfActiveGrants_EA4602B5D38440169F20C21B515F8193" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of active grants</link:label>
    <link:label id="lab_siga_GovernmentContractNumberOfActiveGrants_EA4602B5D38440169F20C21B515F8193_label_en-US" xlink:label="lab_siga_GovernmentContractNumberOfActiveGrants_EA4602B5D38440169F20C21B515F8193" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Government Contract, Number of Active Grants</link:label>
    <link:label id="lab_siga_GovernmentContractNumberOfActiveGrants_EA4602B5D38440169F20C21B515F8193_documentation_en-US" xlink:label="lab_siga_GovernmentContractNumberOfActiveGrants_EA4602B5D38440169F20C21B515F8193" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Government Contract, Number of Active Grants</link:label>
    <link:loc xlink:href="siga-20120930.xsd#siga_GovernmentContractNumberOfActiveGrants" xlink:label="loc_siga_GovernmentContractNumberOfActiveGrants_EA4602B5D38440169F20C21B515F8193" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_siga_GovernmentContractNumberOfActiveGrants_EA4602B5D38440169F20C21B515F8193" xlink:to="lab_siga_GovernmentContractNumberOfActiveGrants_EA4602B5D38440169F20C21B515F8193" xlink:type="arc" />
    <link:label id="lab_siga_ExpectedPotentialFutureAggregateResearchAndDevelopmentExpenses_0C4B40701FED66274016C2EA15A13D0B_terseLabel_en-US" xlink:label="lab_siga_ExpectedPotentialFutureAggregateResearchAndDevelopmentExpenses_0C4B40701FED66274016C2EA15A13D0B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Expected research and development expense</link:label>
    <link:label id="lab_siga_ExpectedPotentialFutureAggregateResearchAndDevelopmentExpenses_0C4B40701FED66274016C2EA15A13D0B_label_en-US" xlink:label="lab_siga_ExpectedPotentialFutureAggregateResearchAndDevelopmentExpenses_0C4B40701FED66274016C2EA15A13D0B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Expected Potential Future Aggregate Research and Development Expenses</link:label>
    <link:label id="lab_siga_ExpectedPotentialFutureAggregateResearchAndDevelopmentExpenses_0C4B40701FED66274016C2EA15A13D0B_documentation_en-US" xlink:label="lab_siga_ExpectedPotentialFutureAggregateResearchAndDevelopmentExpenses_0C4B40701FED66274016C2EA15A13D0B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Expected potential future aggregate research and development funding for specific projects which includes options that may or may not be exercised at the U.S. government's discretion.</link:label>
    <link:loc xlink:href="siga-20120930.xsd#siga_ExpectedPotentialFutureAggregateResearchAndDevelopmentExpenses" xlink:label="loc_siga_ExpectedPotentialFutureAggregateResearchAndDevelopmentExpenses_0C4B40701FED66274016C2EA15A13D0B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_siga_ExpectedPotentialFutureAggregateResearchAndDevelopmentExpenses_0C4B40701FED66274016C2EA15A13D0B" xlink:to="lab_siga_ExpectedPotentialFutureAggregateResearchAndDevelopmentExpenses_0C4B40701FED66274016C2EA15A13D0B" xlink:type="arc" />
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    <link:label id="lab_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_C6EC44C7E4A08B9D36F5A26C3E938463_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_C6EC44C7E4A08B9D36F5A26C3E938463" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other liabilities</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_C6EC44C7E4A08B9D36F5A26C3E938463" xlink:type="locator" />
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_BD89DAFF4237C80E4FCAA26C3E93B9A7_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_BD89DAFF4237C80E4FCAA26C3E93B9A7" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash used in operating activities</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_BD89DAFF4237C80E4FCAA26C3E93B9A7_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_BD89DAFF4237C80E4FCAA26C3E93B9A7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Operating Activities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_BD89DAFF4237C80E4FCAA26C3E93B9A7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_BD89DAFF4237C80E4FCAA26C3E93B9A7" xlink:to="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_BD89DAFF4237C80E4FCAA26C3E93B9A7" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_EDC9790DF6DB0A2E95F0A26C3E93C83F_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_EDC9790DF6DB0A2E95F0A26C3E93C83F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash flows from investing activities:</link:label>
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    <link:label id="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_3ECA2F32955D8FB5B607A26C3E93193C_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_3ECA2F32955D8FB5B607A26C3E93193C" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Capital expenditures</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_3ECA2F32955D8FB5B607A26C3E93193C" xlink:type="locator" />
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    <link:label id="lab_siga_PaymentOfCollateralForCommercialSuretyBond_DCA6DBD59F65670DA683A26C3E93FCFC_negatedTerseLabel_en-US" xlink:label="lab_siga_PaymentOfCollateralForCommercialSuretyBond_DCA6DBD59F65670DA683A26C3E93FCFC" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Collateral for surety bond</link:label>
    <link:label id="lab_siga_PaymentOfCollateralForCommercialSuretyBond_DCA6DBD59F65670DA683A26C3E93FCFC_label_en-US" xlink:label="lab_siga_PaymentOfCollateralForCommercialSuretyBond_DCA6DBD59F65670DA683A26C3E93FCFC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payment of collateral for commercial surety bond</link:label>
    <link:label id="lab_siga_PaymentOfCollateralForCommercialSuretyBond_DCA6DBD59F65670DA683A26C3E93FCFC_documentation_en-US" xlink:label="lab_siga_PaymentOfCollateralForCommercialSuretyBond_DCA6DBD59F65670DA683A26C3E93FCFC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The net cash outflow of funds paid as collateral for a commercial surety bond that are classified as investing activities.</link:label>
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    <link:label id="lab_us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities_2F988855421D895AD689A26C3E93B182_verboseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities_2F988855421D895AD689A26C3E93B182" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from maturity of short term investments</link:label>
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    <link:label id="lab_us-gaap_PaymentsToAcquireShortTermInvestments_BDFD396238E2BCD0051EA26C3E9310CC_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireShortTermInvestments_BDFD396238E2BCD0051EA26C3E9310CC" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Purchases of short term investments</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PaymentsToAcquireShortTermInvestments" xlink:label="loc_us-gaap_PaymentsToAcquireShortTermInvestments_BDFD396238E2BCD0051EA26C3E9310CC" xlink:type="locator" />
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_AF23109356251B0AD43FA26C3E9303EE_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_AF23109356251B0AD43FA26C3E9303EE" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash (used in) provided by investing activities</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_AF23109356251B0AD43FA26C3E9303EE_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_AF23109356251B0AD43FA26C3E9303EE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Investing Activities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_AF23109356251B0AD43FA26C3E9303EE" xlink:type="locator" />
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_34DCE66536DB9C134552A26C3E931623_verboseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_34DCE66536DB9C134552A26C3E931623" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Cash flows from financing activities:</link:label>
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    <link:label id="lab_siga_ProceedsFromIssuanceOfWarrantsAndOptions_F70576B028F1677D7873A26C3E934F58_verboseLabel_en-US" xlink:label="lab_siga_ProceedsFromIssuanceOfWarrantsAndOptions_F70576B028F1677D7873A26C3E934F58" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Net proceeds from exercise of warrants and options</link:label>
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    <link:label id="lab_siga_ProceedsFromIssuanceOfWarrantsAndOptions_F70576B028F1677D7873A26C3E934F58_documentation_en-US" xlink:label="lab_siga_ProceedsFromIssuanceOfWarrantsAndOptions_F70576B028F1677D7873A26C3E934F58" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The cash inflow associated with both the amount received from holders exercising their stock options and issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt). This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_EE26F8E4584A22D0260AA26C3E93803A_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_EE26F8E4584A22D0260AA26C3E93803A" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash provided by financing activities</link:label>
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    <link:label id="lab_us-gaap_BalanceSheetLocationAxis_6D9DA93D25EA06F228B9D1641C967C0A_terseLabel_en-US" xlink:label="lab_us-gaap_BalanceSheetLocationAxis_6D9DA93D25EA06F228B9D1641C967C0A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Balance Sheet Location [Axis]</link:label>
    <link:label id="lab_us-gaap_BalanceSheetLocationAxis_6D9DA93D25EA06F228B9D1641C967C0A_label_en-US" xlink:label="lab_us-gaap_BalanceSheetLocationAxis_6D9DA93D25EA06F228B9D1641C967C0A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Balance Sheet Location [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BalanceSheetLocationAxis" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_6D9DA93D25EA06F228B9D1641C967C0A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_6D9DA93D25EA06F228B9D1641C967C0A" xlink:to="lab_us-gaap_BalanceSheetLocationAxis_6D9DA93D25EA06F228B9D1641C967C0A" xlink:type="arc" />
    <link:label id="lab_us-gaap_BalanceSheetLocationDomain_4490FD5E06547B696578D1641C96F953_terseLabel_en-US" xlink:label="lab_us-gaap_BalanceSheetLocationDomain_4490FD5E06547B696578D1641C96F953" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Balance Sheet Location [Domain]</link:label>
    <link:label id="lab_us-gaap_BalanceSheetLocationDomain_4490FD5E06547B696578D1641C96F953_label_en-US" xlink:label="lab_us-gaap_BalanceSheetLocationDomain_4490FD5E06547B696578D1641C96F953" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Balance Sheet Location [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_4490FD5E06547B696578D1641C96F953" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_4490FD5E06547B696578D1641C96F953" xlink:to="lab_us-gaap_BalanceSheetLocationDomain_4490FD5E06547B696578D1641C96F953" xlink:type="arc" />
    <link:label id="lab_us-gaap_AccruedLiabilitiesMember_B8C2D1524D498CF725F6D1641C969856_terseLabel_en-US" xlink:label="lab_us-gaap_AccruedLiabilitiesMember_B8C2D1524D498CF725F6D1641C969856" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accrued liabilities</link:label>
    <link:label id="lab_us-gaap_AccruedLiabilitiesMember_B8C2D1524D498CF725F6D1641C969856_label_en-US" xlink:label="lab_us-gaap_AccruedLiabilitiesMember_B8C2D1524D498CF725F6D1641C969856" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accrued Liabilities [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AccruedLiabilitiesMember" xlink:label="loc_us-gaap_AccruedLiabilitiesMember_B8C2D1524D498CF725F6D1641C969856" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccruedLiabilitiesMember_B8C2D1524D498CF725F6D1641C969856" xlink:to="lab_us-gaap_AccruedLiabilitiesMember_B8C2D1524D498CF725F6D1641C969856" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherAssetsMember_17FEFA3AF9C28E3DE715D1641C964E00_terseLabel_en-US" xlink:label="lab_us-gaap_OtherAssetsMember_17FEFA3AF9C28E3DE715D1641C964E00" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other assets</link:label>
    <link:label id="lab_us-gaap_OtherAssetsMember_17FEFA3AF9C28E3DE715D1641C964E00_label_en-US" xlink:label="lab_us-gaap_OtherAssetsMember_17FEFA3AF9C28E3DE715D1641C964E00" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Assets [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OtherAssetsMember" xlink:label="loc_us-gaap_OtherAssetsMember_17FEFA3AF9C28E3DE715D1641C964E00" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherAssetsMember_17FEFA3AF9C28E3DE715D1641C964E00" xlink:to="lab_us-gaap_OtherAssetsMember_17FEFA3AF9C28E3DE715D1641C964E00" xlink:type="arc" />
    <link:label id="lab_us-gaap_LossContingenciesLineItems_D407E76068265C9FE96AD1641C962F7D_terseLabel_en-US" xlink:label="lab_us-gaap_LossContingenciesLineItems_D407E76068265C9FE96AD1641C962F7D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Loss Contingencies [Line Items]</link:label>
    <link:label id="lab_us-gaap_LossContingenciesLineItems_D407E76068265C9FE96AD1641C962F7D_label_en-US" xlink:label="lab_us-gaap_LossContingenciesLineItems_D407E76068265C9FE96AD1641C962F7D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loss Contingencies [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LossContingenciesLineItems" xlink:label="loc_us-gaap_LossContingenciesLineItems_D407E76068265C9FE96AD1641C962F7D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LossContingenciesLineItems_D407E76068265C9FE96AD1641C962F7D" xlink:to="lab_us-gaap_LossContingenciesLineItems_D407E76068265C9FE96AD1641C962F7D" xlink:type="arc" />
    <link:label id="lab_siga_DurationOfEquitablePaymentStreamFollowingFirstCommercialSale_5B6B700D8105DFEE2B16D1641C967F9D_terseLabel_en-US" xlink:label="lab_siga_DurationOfEquitablePaymentStreamFollowingFirstCommercialSale_5B6B700D8105DFEE2B16D1641C967F9D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Equitable payment stream following first commercial sale, duration</link:label>
    <link:label id="lab_siga_DurationOfEquitablePaymentStreamFollowingFirstCommercialSale_5B6B700D8105DFEE2B16D1641C967F9D_label_en-US" xlink:label="lab_siga_DurationOfEquitablePaymentStreamFollowingFirstCommercialSale_5B6B700D8105DFEE2B16D1641C967F9D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Duration of Equitable Payment Stream Following First Commercial Sale</link:label>
    <link:label id="lab_siga_DurationOfEquitablePaymentStreamFollowingFirstCommercialSale_5B6B700D8105DFEE2B16D1641C967F9D_documentation_en-US" xlink:label="lab_siga_DurationOfEquitablePaymentStreamFollowingFirstCommercialSale_5B6B700D8105DFEE2B16D1641C967F9D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The Delaware Court of Chancery awarded to PharmAthene an equitable payment stream or equitable lien consisting of fify percent of the net profits that the Company achieves from sales of ST-246 after the Company secures $40 million in net profits, for ten years following the first commercial sale.</link:label>
    <link:loc xlink:href="siga-20120930.xsd#siga_DurationOfEquitablePaymentStreamFollowingFirstCommercialSale" xlink:label="loc_siga_DurationOfEquitablePaymentStreamFollowingFirstCommercialSale_5B6B700D8105DFEE2B16D1641C967F9D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_siga_DurationOfEquitablePaymentStreamFollowingFirstCommercialSale_5B6B700D8105DFEE2B16D1641C967F9D" xlink:to="lab_siga_DurationOfEquitablePaymentStreamFollowingFirstCommercialSale_5B6B700D8105DFEE2B16D1641C967F9D" xlink:type="arc" />
    <link:label id="lab_siga_PercentageOfNetProfitsFromSalesAfterNetProfitMilestoneResultingFromAwardDamages_9CA4F409FE90E3051CCAD1641C968991_terseLabel_en-US" xlink:label="lab_siga_PercentageOfNetProfitsFromSalesAfterNetProfitMilestoneResultingFromAwardDamages_9CA4F409FE90E3051CCAD1641C968991" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Percentage of net profits from sales after net profit threshold</link:label>
    <link:label id="lab_siga_PercentageOfNetProfitsFromSalesAfterNetProfitMilestoneResultingFromAwardDamages_9CA4F409FE90E3051CCAD1641C968991_label_en-US" xlink:label="lab_siga_PercentageOfNetProfitsFromSalesAfterNetProfitMilestoneResultingFromAwardDamages_9CA4F409FE90E3051CCAD1641C968991" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Percentage of Net Profits from Sales After Net Profit Milestone Resulting From Award Damages</link:label>
    <link:label id="lab_siga_PercentageOfNetProfitsFromSalesAfterNetProfitMilestoneResultingFromAwardDamages_9CA4F409FE90E3051CCAD1641C968991_documentation_en-US" xlink:label="lab_siga_PercentageOfNetProfitsFromSalesAfterNetProfitMilestoneResultingFromAwardDamages_9CA4F409FE90E3051CCAD1641C968991" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The Delaware Court of Chancery awarded to PharmAthene an equitable payment stream or equitable lien consisting of fify percent of the net profits that the Company achieves from sales of ST-246 after the Company secures $40 million in net profits, for ten years following the first commercial sale.</link:label>
    <link:loc xlink:href="siga-20120930.xsd#siga_PercentageOfNetProfitsFromSalesAfterNetProfitMilestoneResultingFromAwardDamages" xlink:label="loc_siga_PercentageOfNetProfitsFromSalesAfterNetProfitMilestoneResultingFromAwardDamages_9CA4F409FE90E3051CCAD1641C968991" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_siga_PercentageOfNetProfitsFromSalesAfterNetProfitMilestoneResultingFromAwardDamages_9CA4F409FE90E3051CCAD1641C968991" xlink:to="lab_siga_PercentageOfNetProfitsFromSalesAfterNetProfitMilestoneResultingFromAwardDamages_9CA4F409FE90E3051CCAD1641C968991" xlink:type="arc" />
    <link:label id="lab_siga_NetProfitMilestone_79E57D84B44F41DC74A6D1641C960787_terseLabel_en-US" xlink:label="lab_siga_NetProfitMilestone_79E57D84B44F41DC74A6D1641C960787" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net profit threshold</link:label>
    <link:label id="lab_siga_NetProfitMilestone_79E57D84B44F41DC74A6D1641C960787_label_en-US" xlink:label="lab_siga_NetProfitMilestone_79E57D84B44F41DC74A6D1641C960787" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Profit Milestone</link:label>
    <link:label id="lab_siga_NetProfitMilestone_79E57D84B44F41DC74A6D1641C960787_documentation_en-US" xlink:label="lab_siga_NetProfitMilestone_79E57D84B44F41DC74A6D1641C960787" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The Delaware Court of Chancery awarded to PharmAthene an equitable payment stream or equitable lien consisting of fify percent of the net profits that the Company achieves from sales of ST-246 after the Company secures $40 million in net profits, for ten years following the first commercial sale</link:label>
    <link:loc xlink:href="siga-20120930.xsd#siga_NetProfitMilestone" xlink:label="loc_siga_NetProfitMilestone_79E57D84B44F41DC74A6D1641C960787" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_siga_NetProfitMilestone_79E57D84B44F41DC74A6D1641C960787" xlink:to="lab_siga_NetProfitMilestone_79E57D84B44F41DC74A6D1641C960787" xlink:type="arc" />
    <link:label id="lab_us-gaap_LossContingencyAccrualAtCarryingValue_1D497F40F1AA3454F5D5D1641C96DD92_terseLabel_en-US" xlink:label="lab_us-gaap_LossContingencyAccrualAtCarryingValue_1D497F40F1AA3454F5D5D1641C96DD92" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accrued liabilities, current</link:label>
    <link:label id="lab_us-gaap_LossContingencyAccrualAtCarryingValue_1D497F40F1AA3454F5D5D1641C96DD92_label_en-US" xlink:label="lab_us-gaap_LossContingencyAccrualAtCarryingValue_1D497F40F1AA3454F5D5D1641C96DD92" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loss Contingency Accrual, at Carrying Value</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LossContingencyAccrualAtCarryingValue" xlink:label="loc_us-gaap_LossContingencyAccrualAtCarryingValue_1D497F40F1AA3454F5D5D1641C96DD92" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LossContingencyAccrualAtCarryingValue_1D497F40F1AA3454F5D5D1641C96DD92" xlink:to="lab_us-gaap_LossContingencyAccrualAtCarryingValue_1D497F40F1AA3454F5D5D1641C96DD92" xlink:type="arc" />
    <link:label id="lab_siga_AmountPlaintiffMayRecover_38879B739AB56FD1F0A6D1641C96E25B_terseLabel_en-US" xlink:label="lab_siga_AmountPlaintiffMayRecover_38879B739AB56FD1F0A6D1641C96E25B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Plaintiff attorneys' fee and expenses</link:label>
    <link:label id="lab_siga_AmountPlaintiffMayRecover_38879B739AB56FD1F0A6D1641C96E25B_label_en-US" xlink:label="lab_siga_AmountPlaintiffMayRecover_38879B739AB56FD1F0A6D1641C96E25B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Amount Plaintiff May Recover</link:label>
    <link:label id="lab_siga_AmountPlaintiffMayRecover_38879B739AB56FD1F0A6D1641C96E25B_documentation_en-US" xlink:label="lab_siga_AmountPlaintiffMayRecover_38879B739AB56FD1F0A6D1641C96E25B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The Delaware Court of Chancery awarded PharmAthene one-third of its reasonable attorneys' fees and expert witness expenses.</link:label>
    <link:loc xlink:href="siga-20120930.xsd#siga_AmountPlaintiffMayRecover" xlink:label="loc_siga_AmountPlaintiffMayRecover_38879B739AB56FD1F0A6D1641C96E25B" xlink:type="locator" />
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    <link:label id="lab_siga_PaymentToPostCollateralForSuretyBond_116CFBF0F62741A0E3C2D1641C969BA7_terseLabel_en-US" xlink:label="lab_siga_PaymentToPostCollateralForSuretyBond_116CFBF0F62741A0E3C2D1641C969BA7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Payment to post collateral for surety bond</link:label>
    <link:label id="lab_siga_PaymentToPostCollateralForSuretyBond_116CFBF0F62741A0E3C2D1641C969BA7_label_en-US" xlink:label="lab_siga_PaymentToPostCollateralForSuretyBond_116CFBF0F62741A0E3C2D1641C969BA7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payment to Post Collateral for Surety Bond</link:label>
    <link:label id="lab_siga_PaymentToPostCollateralForSuretyBond_116CFBF0F62741A0E3C2D1641C969BA7_documentation_en-US" xlink:label="lab_siga_PaymentToPostCollateralForSuretyBond_116CFBF0F62741A0E3C2D1641C969BA7" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Payment to post collateral for surety bond.</link:label>
    <link:loc xlink:href="siga-20120930.xsd#siga_PaymentToPostCollateralForSuretyBond" xlink:label="loc_siga_PaymentToPostCollateralForSuretyBond_116CFBF0F62741A0E3C2D1641C969BA7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_siga_PaymentToPostCollateralForSuretyBond_116CFBF0F62741A0E3C2D1641C969BA7" xlink:to="lab_siga_PaymentToPostCollateralForSuretyBond_116CFBF0F62741A0E3C2D1641C969BA7" xlink:type="arc" />
    <link:label id="lab_siga_LitigationCostsAwardedPercentage_9DCA809DA580A10A60B0D1641C966BB2_terseLabel_en-US" xlink:label="lab_siga_LitigationCostsAwardedPercentage_9DCA809DA580A10A60B0D1641C966BB2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Percentage of litigation costs awarded</link:label>
    <link:label id="lab_siga_LitigationCostsAwardedPercentage_9DCA809DA580A10A60B0D1641C966BB2_label_en-US" xlink:label="lab_siga_LitigationCostsAwardedPercentage_9DCA809DA580A10A60B0D1641C966BB2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Litigation Costs Awarded, Percentage</link:label>
    <link:label id="lab_siga_LitigationCostsAwardedPercentage_9DCA809DA580A10A60B0D1641C966BB2_documentation_en-US" xlink:label="lab_siga_LitigationCostsAwardedPercentage_9DCA809DA580A10A60B0D1641C966BB2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The Delaware Court of Chancery awarded PharmAthene one-third of its reasonable attorneys' fees and expert witness expenses.</link:label>
    <link:loc xlink:href="siga-20120930.xsd#siga_LitigationCostsAwardedPercentage" xlink:label="loc_siga_LitigationCostsAwardedPercentage_9DCA809DA580A10A60B0D1641C966BB2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_siga_LitigationCostsAwardedPercentage_9DCA809DA580A10A60B0D1641C966BB2" xlink:to="lab_siga_LitigationCostsAwardedPercentage_9DCA809DA580A10A60B0D1641C966BB2" xlink:type="arc" />
    <link:label id="lab_us-gaap_DeferredTaxAssetsNet_F0A43D8906E5A6110020C21B81C5CDE8_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredTaxAssetsNet_F0A43D8906E5A6110020C21B81C5CDE8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Deferred tax assets, net of valuation allowance</link:label>
    <link:label id="lab_us-gaap_DeferredTaxAssetsNet_F0A43D8906E5A6110020C21B81C5CDE8_label_en-US" xlink:label="lab_us-gaap_DeferredTaxAssetsNet_F0A43D8906E5A6110020C21B81C5CDE8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Tax Assets, Net of Valuation Allowance</link:label>
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