This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
Which is not transmitted by ahopod ? 
Select and explain. 
A. Rickettsia prowazakii, B. Coxiella burnetii, C. Rickettsia akari, D. Rickettsia rickettsii
B: Coxiella burnetii
Answer: B: Coxiella burnetii 
Explanation: 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.