<prompt> Which of the following causes epidemic typhusR. typhiR. prowazekiiR. rickettsiiR. tsutsugamushi  <response>: R prawazekii causes epidemic typhus,distribution is worldwide, in recent times main foci have been eastern Europe,Africa,South America and Asia.in india the endemic spot is kashmir,Humans are the only natural veebrate host,pediculus humanus corporishuman body louse is the vector,so this disease is also called loseborne typhus Ref:Ananthnarayan and panikers microbiology 10th edition 