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: Unknown
Which is not transmitted by arthropod : 
Select and explain. 
A. Rickettsia prowazaki, B. Coxiella burneti, C. Rickettsia akasi, D. Rickettsia rickettsi
B: Coxiella burneti
Answer: B: Coxiella burneti 
Explanation: 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 Arthropod"Human 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*