should be ready.

code/datums/diseases/_MobProcs.dm

@@ -117,7 +117,7 @@
 /mob/living/carbon/AirborneContractDisease(datum/disease/D, force_spread)
 	if(internal)
 		return
-	if(has_trait(TRAIT_NOBREATH))
+	if(HAS_TRAIT(src, TRAIT_NOBREATH))
 		return
 	..()
 
@@ -137,7 +137,7 @@
 
 /mob/living/carbon/human/CanContractDisease(datum/disease/D)
 	if(dna)
-		if(has_trait(TRAIT_VIRUSIMMUNE) && !D.bypasses_immunity)
+		if(HAS_TRAIT(src, TRAIT_VIRUSIMMUNE) && !D.bypasses_immunity)
 			return FALSE
 
 	for(var/thing in D.required_organs)

code/datums/diseases/advance/symptoms/heal.dm

@@ -233,7 +233,7 @@
 
 /datum/symptom/heal/coma/CanHeal(datum/disease/advance/A)
 	var/mob/living/M = A.affected_mob
-	if(M.has_trait(TRAIT_DEATHCOMA))
+	if(HAS_TRAIT(M, TRAIT_DEATHCOMA))
 		return power
 	else if(M.IsUnconscious() || M.stat == UNCONSCIOUS)
 		return power * 0.9

code/datums/diseases/advance/symptoms/sensory.dm

@@ -85,14 +85,14 @@
 		if(4, 5)
 			M.restoreEars()
 
-			if(M.has_trait(TRAIT_BLIND, EYE_DAMAGE))
+			if(HAS_TRAIT_FROM(M, TRAIT_BLIND, EYE_DAMAGE))
 				if(prob(20))
 					to_chat(M, "<span class='notice'>Your vision slowly returns...</span>")
 					M.cure_blind(EYE_DAMAGE)
 					M.cure_nearsighted(EYE_DAMAGE)
 					M.blur_eyes(35)
 
-				else if(M.has_trait(TRAIT_NEARSIGHT, EYE_DAMAGE))
+				else if(HAS_TRAIT_FROM(M, TRAIT_NEARSIGHT, EYE_DAMAGE))
 					to_chat(M, "<span class='notice'>You can finally focus your eyes on distant objects.</span>")
 					M.cure_nearsighted(EYE_DAMAGE)
 					M.blur_eyes(10)

code/datums/diseases/advance/symptoms/vision.dm

@@ -61,7 +61,7 @@ Bonus
 					M.become_nearsighted(EYE_DAMAGE)
 				if(prob(eyes.eye_damage - 10 + 1))
 					if(!remove_eyes)
-						if(!M.has_trait(TRAIT_BLIND))
+						if(!HAS_TRAIT(M, TRAIT_BLIND))
 							to_chat(M, "<span class='userdanger'>You go blind!</span>")
 						M.become_blind(EYE_DAMAGE)
 					else