Symptoms of infection, which begin suddenly about 1 to 2 weeks after exposure, include high fever, severe headache, dry cough, chills, limb pain, nausea and vomiting. Typhus rash typically appears first on the torso then spreads over the body. Delirium and neurological symptoms may appear, and survivors may suffer permanent damage. If untreated, the disease may either resolve or result in death after about 2 weeks; the death rate if untreated is 30 percent.