diff --git a/CHANGE LOG 1.0.5.1.txt b/CHANGE LOG 1.0.5.1.txt
index e6da61761..01a9d96f6 100644
--- a/CHANGE LOG 1.0.5.1.txt	
+++ b/CHANGE LOG 1.0.5.1.txt	
@@ -3,6 +3,8 @@
 
 [FIXED] Fixed client crash when player has chainsaw due to corrupt RTM file. @vbawol
 
+[CHANGED] An infection chance of -1 disables self-transfusion infection. 0 is always infected. (DZE_selfTransfuse_Values) @icomrade
+
 [INFO] dayz_epoch1051.bikey found in client files "Keys" folder.
 [INFO] Server admins should add requiredSecureId = 2; to their server.cfg to prevent uid spoofing.
 [INFO] Models/textures by Paul Tomany. @Sequisha.
diff --git a/SQF/dayz_code/medical/publicEH/medTransfuse.sqf b/SQF/dayz_code/medical/publicEH/medTransfuse.sqf
index 71161cc8f..b57bf3146 100644
--- a/SQF/dayz_code/medical/publicEH/medTransfuse.sqf
+++ b/SQF/dayz_code/medical/publicEH/medTransfuse.sqf
@@ -9,7 +9,11 @@ if (_unit == player) then {
 		_selfTransValues = _this select 1;
 		r_player_blood = r_player_blood + (_selfTransValues select 0);
 		if (r_player_blood > 12000) then {r_player_blood = 12000;};
-		_TransfusionInfection = ((random (_selfTransValues select 1)) < 1);
+		if ((_selfTransValues select 1) < 0) then {
+			_TransfusionInfection = false;
+		} else {
+			_TransfusionInfection = ((random (_selfTransValues select 1)) < 1);
+		};
 	} else {
 		r_player_blood = r_player_bloodTotal;
 	};