<prompt> Which is not transmitted by ahopod ?Rickettsia prowazakiiCoxiella burnetiiRickettsia akariRickettsia rickettsii  <response>: Ans. is b i.e., Coxiella burnetti . The Q fever agent differs from other rickettsiae in many features. - Smaller size - Greater resistance to heat and drying - Major transmission route being inhalation or ingestion. - Independent of ahropod vector. Remember . In milk, Coxiella burnetii may survive pasteurization by the holding method, but the flash method is effective. 