Questions: The infectious agents that cause Rocky Mountain spotted fever and epidemic typhus are transmitted to the human body via vector such as a tick. What are these infectious agents? O Ehrlichia O Rickettsia O Chlamydiae O Viruses

The infectious agents that cause Rocky Mountain spotted fever and epidemic typhus are transmitted to the human body via vector such as a tick. What are these infectious agents? O Ehrlichia O Rickettsia O Chlamydiae O Viruses
Transcript text: The infectious agents that cause Rocky Mountain spotted fever and epidemic typhus are transmitted to the human body via vector such as a tick. What are these infectious agents? O Ehrlichia O Rickettsia O Chlamydiae O Viruses
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Solution

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The answer is the second one (B): Rickettsia.

Explanation for each option:

  • Ehrlichia: This is incorrect. Ehrlichia is a genus of bacteria that causes ehrlichiosis, which is transmitted by ticks, but it is not responsible for Rocky Mountain spotted fever or epidemic typhus.

  • Rickettsia: This is correct. Rickettsia is a genus of bacteria that includes species responsible for Rocky Mountain spotted fever (caused by Rickettsia rickettsii) and epidemic typhus (caused by Rickettsia prowazekii). These bacteria are transmitted to humans via vectors such as ticks and lice.

  • Chlamydiae: This is incorrect. Chlamydiae are a different group of bacteria that cause diseases such as chlamydia infections, but they are not responsible for Rocky Mountain spotted fever or epidemic typhus.

  • Viruses: This is incorrect. Viruses are a different type of infectious agent and are not responsible for the diseases mentioned in the question.

In summary, the infectious agents that cause Rocky Mountain spotted fever and epidemic typhus are Rickettsia.

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