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<roleRef xlink:type="simple" xlink:href="atos-20120930.xsd#PREPAIDEXPENSESDetails" roleURI="http://www.atossagenetics.com/role/PREPAIDEXPENSESDetails"/>
<calculationLink xlink:type="extended" xlink:role="http://www.atossagenetics.com/role/PREPAIDEXPENSESDetails"><loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PrepaidExpenseCurrent" xlink:label="loc_us-gaap_PrepaidExpenseCurrent"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PrepaidTaxes" xlink:label="loc_us-gaap_PrepaidTaxes"/>
<calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PrepaidExpenseCurrent" xlink:to="loc_us-gaap_PrepaidTaxes" order="0" use="optional" weight="1"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PrepaidInsurance" xlink:label="loc_us-gaap_PrepaidInsurance"/>
<calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PrepaidExpenseCurrent" xlink:to="loc_us-gaap_PrepaidInsurance" order="1" use="optional" weight="1"/>
<loc xlink:type="locator" xlink:href="atos-20120930.xsd#atos_PrepaidMaintenanceAndSupportServiceFee" xlink:label="loc_atos_PrepaidMaintenanceAndSupportServiceFee"/>
<calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PrepaidExpenseCurrent" xlink:to="loc_atos_PrepaidMaintenanceAndSupportServiceFee" order="2" use="optional" weight="1"/>
<loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PrepaidRent" xlink:label="loc_us-gaap_PrepaidRent"/>
<calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PrepaidExpenseCurrent" xlink:to="loc_us-gaap_PrepaidRent" order="3" use="optional" weight="1"/>


</calculationLink>
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