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  <xsd:element abstract="true" id="abus_WellsFargoMember" name="WellsFargoMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="abus_WhollyOwnedSubsidiariesIncludedinFinancialStatements" name="WhollyOwnedSubsidiariesIncludedinFinancialStatements" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
</xsd:schema>