DOC for the treatment of Tularemia is:
**Core Concept**
Tularemia is a zoonotic disease caused by the bacterium *Francisella tularensis*, which primarily affects the lungs, skin, and lymphatic system. The disease is typically transmitted through contact with infected animals, contaminated water, or vectors like ticks and deer flies.
**Why the Correct Answer is Right**
The treatment of tularemia involves the use of antibiotics, specifically those effective against Gram-negative bacteria. **Gramicidin** is not a first-line treatment for tularemia, but **streptomycin** is a preferred choice due to its efficacy against *Francisella tularensis*. The mechanism of action of streptomycin involves inhibiting bacterial protein synthesis by binding to the 30S ribosomal subunit, thereby preventing the elongation of the peptide chain.
**Why Each Wrong Option is Incorrect**
* **Option A:** **Gentamicin** is an aminoglycoside antibiotic like streptomycin but is not the preferred choice for treating tularemia.
* **Option B:** **Ciprofloxacin** is a fluoroquinolone antibiotic with broad-spectrum activity, but it is not the first-line treatment for tularemia.
* **Option D:** **Erythromycin** is a macrolide antibiotic effective against Gram-positive bacteria, but it is not suitable for treating tularemia.
**Clinical Pearl / High-Yield Fact**
Tularemia can manifest in several forms, including ulceroglandular, glandular, and pneumonic, with the latter being the most severe and life-threatening. Prompt antibiotic treatment is essential to prevent complications and ensure a favorable outcome.
**Correct Answer: C. Streptomycin**