Discussion
Which of the following does not need an insect vector for transmission ?
Answer: D
The organism that does not need an insect vector is Coxiella burnetii.
Coxiella burnetii causes Q fever. It forms highly resistant spore-like small cell variants that survive in dust and animal products, and people are infected mainly by inhaling aerosols from infected livestock, especially birth products. No arthropod vector is needed, though ticks can carry it among animals.
The others depend on arthropod vectors: Rickettsia prowazekii (epidemic typhus) is spread by the body louse, Rickettsia rickettsii (Rocky Mountain spotted fever) by ticks, and Ehrlichia chaffeensis (human monocytic ehrlichiosis) by the lone star tick.
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