moving code should always be tested before commiting

monkestation/code/modules/virology/living/infection_procs.dm

@@ -132,8 +132,8 @@
 						//and even if they occur, the new effect will have a badness similar to the old one, so helpful pathogen won't instantly become deadly ones.
 	else
 		//Slowly decay back to regular strength immune system while you are sick
-		if(mob.immune_system.strength > 1)
-			mob.immune_system.strength = max(mob.immune_system.strength - 0.01, 1)
+		if(immune_system.strength > 1)
+			immune_system.strength = max(immune_system.strength - 0.01, 1)
 
 /mob/living/proc/try_contact_infect(datum/disease/advanced/D, zone = BODY_ZONE_EVERYTHING, note = "Try Contact Infect")
 	if(!(D.spread_flags & DISEASE_SPREAD_CONTACT_SKIN))