Fixes #5264

Viruses are properly transferred to spilled blood now.
Antigens prevent from infection properly.
Lowered frequency of blood puddle virus check to cut down on processing.

code/game/turfs/simulated.dm

@@ -144,8 +144,11 @@
 	for(var/obj/effect/decal/cleanable/blood/B in contents)
 		if(!B.blood_DNA[M.dna.unique_enzymes])
 			B.blood_DNA[M.dna.unique_enzymes] = M.dna.b_type
+			B.virus2 = virus_copylist(M.virus2)
 		return 1 //we bloodied the floor
 
+
+
 	//if there isn't a blood decal already, make one.
 	var/obj/effect/decal/cleanable/blood/newblood = new /obj/effect/decal/cleanable/blood(src)
 
@@ -156,6 +159,7 @@
 		newblood.basecolor = "#A10808"
 
 	newblood.blood_DNA[M.dna.unique_enzymes] = M.dna.b_type
+	newblood.virus2 = virus_copylist(M.virus2)
 	newblood.update_icon()
 
 	return 1 //we bloodied the floor

code/modules/mob/living/carbon/human/life.dm

@@ -308,11 +308,11 @@
 
 		var/datum/gas_mixture/environment = loc.return_air()
 		var/datum/gas_mixture/breath
-		
+
 		// HACK NEED CHANGING LATER
 		if(health < config.health_threshold_crit && !reagents.has_reagent("inaprovaline"))
 			losebreath++
-		
+
 		if(losebreath>0) //Suffocating so do not take a breath
 			losebreath--
 			if (prob(10)) //Gasp per 10 ticks? Sounds about right.
@@ -1487,21 +1487,21 @@
 			for (var/ID in virus2)
 				var/datum/disease2/disease/V = virus2[ID]
 				V.cure(src)
+		if(life_tick % 3) //don't spam checks over all objects in view every tick.
+			for(var/obj/effect/decal/cleanable/O in view(1,src))
+				if(istype(O,/obj/effect/decal/cleanable/blood))
+					var/obj/effect/decal/cleanable/blood/B = O
+					if(B.virus2.len)
+						for (var/ID in B.virus2)
+							var/datum/disease2/disease/V = B.virus2[ID]
+							infect_virus2(src,V.getcopy())
 
-		for(var/obj/effect/decal/cleanable/O in view(1,src))
-			if(istype(O,/obj/effect/decal/cleanable/blood))
-				var/obj/effect/decal/cleanable/blood/B = O
-				if(B.virus2.len)
-					for (var/ID in B.virus2)
-						var/datum/disease2/disease/V = B.virus2[ID]
-						infect_virus2(src,V)
-
-			else if(istype(O,/obj/effect/decal/cleanable/mucus))
-				var/obj/effect/decal/cleanable/mucus/M = O
-				if(M.virus2.len)
-					for (var/ID in M.virus2)
-						var/datum/disease2/disease/V = M.virus2[ID]
-						infect_virus2(src,V)
+				else if(istype(O,/obj/effect/decal/cleanable/mucus))
+					var/obj/effect/decal/cleanable/mucus/M = O
+					if(M.virus2.len)
+						for (var/ID in M.virus2)
+							var/datum/disease2/disease/V = M.virus2[ID]
+							infect_virus2(src,V.getcopy())
 
 
 		if(virus2.len)

code/modules/organs/blood.dm

@@ -159,6 +159,9 @@ var/const/BLOOD_VOLUME_SURVIVE = 122
 		this.icon_state = pick(iconL)
 		this.blood_DNA = list()
 		this.blood_DNA[dna.unique_enzymes] = dna.b_type
+		for (var/ID in virus2)
+			var/datum/disease2/disease/V = virus2[ID]
+			this.virus2[ID] = V.getcopy()
 		if (species) this.basecolor = species.blood_color
 		this.update_icon()
 

code/modules/reagents/Chemistry-Reagents.dm

@@ -118,10 +118,15 @@ datum
 						else //injected
 							M.contract_disease(D, 1, 0)
 				if(self.data && self.data["virus2"] && istype(M, /mob/living/carbon))//infecting...
-					if(method == TOUCH)
-						infect_virus2(M,self.data["virus2"])
-					else
-						infect_virus2(M,self.data["virus2"],1) //injected, force infection!
+					var/list/vlist = self.data["virus2"]
+					if (vlist.len)
+						for (var/ID in vlist)
+							var/datum/disease2/disease/V = vlist[ID]
+
+							if(method == TOUCH)
+								infect_virus2(M,V.getcopy())
+							else
+								infect_virus2(M,V.getcopy(),1) //injected, force infection!
 				if(self.data && self.data["antibodies"] && istype(M, /mob/living/carbon))//... and curing
 					var/mob/living/carbon/C = M
 					C.antibodies |= self.data["antibodies"]
@@ -146,6 +151,9 @@ datum
 						blood_prop.viruses += newVirus
 						newVirus.holder = blood_prop
 
+					if(self.data["virus2"])
+						blood_prop.virus2 = virus_copylist(self.data["virus2"])
+
 
 				else if(istype(self.data["donor"], /mob/living/carbon/monkey))
 					var/obj/effect/decal/cleanable/blood/blood_prop = locate() in T

code/modules/virus2/helpers.dm

@@ -68,10 +68,11 @@ proc/airborne_can_reach(turf/source, turf/target)
 	if ("[disease.uniqueID]" in M.virus2)
 		return
 	// if one of the antibodies in the mob's body matches one of the disease's antigens, don't infect
-	if(M.antibodies & disease.antigen != 0)
+	if((M.antibodies & disease.antigen) != 0)
 		return
 	if(M.reagents.has_reagent("spaceacillin"))
 		return
+
 	if(istype(M,/mob/living/carbon/monkey))
 		var/mob/living/carbon/monkey/chimp = M
 		if (!(chimp.greaterform in disease.affected_species))