Which of the following is used for Rickettsia ?
**Core Concept**
The question is testing knowledge of antibiotic therapy for Rickettsial infections, which are caused by obligate intracellular bacteria. **Rickettsia** species are transmitted by ticks and other vectors, leading to diseases like Rocky Mountain spotted fever.
**Why the Correct Answer is Right**
The correct answer is likely an antibiotic effective against intracellular pathogens. **Doxycycline** is a commonly used treatment for Rickettsial infections due to its ability to penetrate cells and inhibit protein synthesis.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because it is not typically used for Rickettsia.
**Option B:** Incorrect as it is not the first-line treatment.
**Option C:** Incorrect because it lacks efficacy against Rickettsia.
**Clinical Pearl / High-Yield Fact**
Remember that **Doxycycline** is the drug of choice for most Rickettsial infections, given its excellent intracellular penetration and efficacy.
**Correct Answer:** D. Doxycycline