<prompt> Epidemic typhus is caused byRickettsia tsutsugamushiRickettsia QuintanaRickettsia rickettsiaeRickettsia prowazekii  <response>: D Rickettsia prowazekii Epidemic typhus is caused by R. prowazekii. R. prowazekii named after von Prowazek, who had contracted fatal typhus fever while investigating the disease. Amongst the options provided Louse is the insect vector only for Rickettsia Prowazakii. RICKETTSIAL INFECTION INSECT VECTORS: Louse: Rickettsia Prowazekii Epidemic typhus Bartonella quintana Trench fever Mites: Rickettsia tsutsugamushi scrub typhus Rickettsia akari Rickettsial pox Ticks: Rickettsia rickettsii Rocky Mountain Spotted Fever Rickettsia conori Ticky Typhus, Tick Fever Rickettsia australis Tick typhus Rickettsia sibrica Tick typhus Fleas: Rickettsia typhi Endemic typhus Q Fever: Human infection occurs from inhalation of dust No insect vectors Etiological agent is Coxiella burneti Insect vector is None 