<prompt> Answer this question truthfullyWhat is the relationship between Typhus and Natural History, considering its complications and prognosis?  <response>: <reason> Rickettsioses range in severity from diseases that are usually relatively mild rickettsialpox, cat scratch disease, and African tick-bite fever to those that can be life-threatening epidemic and murine typhus, Rocky Mountain spotted fever, scrub typhus and Oroya fever, and they vary in duration from those that can be self-limiting to chronic Q fever and bartonelloses or recrudescent Brill-Zinsser disease. Without treatment, feve r may last 2 weeks, followed by a prolonged recovery time and a significantly greater chance of developing complications. Possible complications include renal insufficiency, pneumonia, meningitis. Without treatment, death may occur in 10 - 60 of patients with epidemic typhus. Patients over age 60 have the highest risk of death. 