Many improvements to vira.

Implemented an efficient system for infection. Made sneeze and cough increase infection chance. Increased the lifespan of spaceacillin in a host. Removed the drool symptom.

code/modules/chemical/Chemistry-Reagents.dm

@@ -1456,8 +1456,7 @@ datum
 			color = "#C8A5DC" // rgb: 200, 165, 220
 
 			on_mob_life(var/mob/living/M as mob)//no more mr. panacea
-				holder.remove_reagent(src.id, 0.2)
-				..()
+				holder.remove_reagent(src.id, 0.1)
 				return
 
 		carpotoxin

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

@@ -998,14 +998,7 @@
 					D.cure()
 
 			if(!virus2)
-			    // the following is silly since it lets you infect people through glass
-				/*for(var/mob/living/carbon/M in oviewers(4,src))
-					if(M.virus2)
-						infect_virus2(src,M.virus2)*/
-				// instead we're going to use little floating disease objects
-				for(var/obj/virus/V in src.loc) if(src.get_infection_chance())
-					infect_virus2(src,V.disease)
-				for(var/obj/effect/decal/cleanable/blood/B in view(4, src))
+				for(var/obj/effect/decal/cleanable/blood/B in src.loc)
 					if(B.virus2)
 						infect_virus2(src,B.virus2)
 			else
@@ -1016,12 +1009,6 @@
 
 				// check if we're immune
 				if(virus2.antigen & src.antibodies) virus2.dead = 1
-				if(src.get_infection_chance())
-				    // need more pathogens
-					for(var/i=0, i<3, i++)
-						var/obj/virus/V = new(src.loc)
-						V.disease = src.virus2
-
 
 
 			return