Organism that does NOT need vector for transmission:: (A) Rickettsia prowazekii, (B) Rickettsia rickettsii, (C) Coxiella burnetii, (D) Borrelia recurrentis
Answer is C. Coxiella burnetii causes Q fever. Q fever transmission differs from other rickettsial infection in that there is no ahropod involved in its transmission to man. Transmission results from inhalation, ingestion, abrasion or directly in conjunctiva. Ref: Park 21st edition, page 276.