Appendix-less mobs cannot contract appendicitis

code/modules/events/spontaneous_appendicitis.dm

@@ -6,6 +6,8 @@
 			continue
 		if(H.species.virus_immune) //don't count things that are virus immune; they'll just get picked and auto-cure
 			continue
+		if(!H.get_int_organ(/obj/item/organ/internal/appendix))
+			continue
 		var/foundAlready = 0	//don't infect someone that already has the virus
 		for(var/datum/disease/D in H.viruses)
 			foundAlready = 1
@@ -14,4 +16,4 @@
 
 		var/datum/disease/D = new /datum/disease/appendicitis
 		H.ForceContractDisease(D)
-		break
+		break