<prompt> Which of the following is true about Endemic typhus?Cause is Rickettsia prowazekiiVector is fleaReservoir is humansTetracycline is not useful for treatment  <response>: Endemic typhus Also known as: Flea-borne typhus, murine typhus Causative agent: Rickettsia typhi Vector: rat flea Reservoir: Rodents Weil felix reaction becomes ve in : 2nd week Drug of choice: Tetracycline. 