<prompt> Which is not transmitted by arthropod :Rickettsia prowazakiCoxiella burnetiRickettsia akasiRickettsia rickettsi  <response>: Ans. is b i.e. Coxiella Burnetti Rickettsia is a small obligate intracellular parasite and except for Q fever caused by Coxiella burnetti are transmitted to human by ArthropodHuman Diseases Caused By RickettsiaOrganism Disease Vector Rickettsia prowazekii Epidemic Typhus louse Rickettsia typhi Endemic Typhus Flea Orientia Tsutsugamushi Scrub Typhus Mite Rickettsia Ricketsei Rocky mountain spotted fever Tick Rickettsia Akari Rickettsialpox Mite Coxiella Burnetti Q fever Airborne fomites 