Fever is a symptom in DayZ Standalone. Fevers are caused by cholera, influenza, and Wound Infection and will cause the player's body temperature to increase and occasional blurry vision. The survivor will occasionally wipe their forehead, similar to how they would if near a burning campfire or other hot areas. This forehead wipe can leave you temporarily vulnerable. For more information on the effects of higher body temperature go to Hyperthermia or Hypothermia.