diff --git a/model/Host/Human.cpp b/model/Host/Human.cpp
index c616b580..797fe4a0 100644
--- a/model/Host/Human.cpp
+++ b/model/Host/Human.cpp
@@ -144,7 +144,7 @@ void Human::removeFirstEvent(interventions::SubPopRemove::RemoveAtCode code )
     for( auto it = removeAtList.begin(), end = removeAtList.end(); it != end; ++it ){
         auto expIt = subPopExp.find( *it );
         if( expIt != subPopExp.end() ){
-            if( expIt->second > sim::nowOrTs0() ){
+            if( expIt->second >= sim::nowOrTs0() ){
                 // removeFirstEvent() is used for onFirstBout, onFirstTreatment
                 // and onFirstInfection cohort options. Health system memory must
                 // be reset for this to work properly; in theory the memory should
diff --git a/model/Host/Human.h b/model/Host/Human.h
index 800a7f08..971bac60 100644
--- a/model/Host/Human.h
+++ b/model/Host/Human.h
@@ -164,7 +164,7 @@ inline SimTime Human::age( SimTime time ) const {
 inline bool Human::isInSubPop( interventions::ComponentId id ) const {
     auto it = subPopExp.find( id );
     if( it == subPopExp.end() ) return false;   // no history of membership
-    else return it->second > sim::nowOrTs0();   // added: has expired?
+    else return it->second >= sim::nowOrTs0();   // added: has expired?
 }
 
 inline uint32_t Human::getCohortSet() const {