What is drug of choice in dysentery due to shigella?
**Core Concept**
Shigella infections, causing dysentery, require antibiotic treatment to reduce the duration and severity of symptoms, as well as to prevent transmission. The choice of antibiotic is crucial due to potential resistance patterns.
**Why the Correct Answer is Right**
The drug of choice for treating shigellosis is ciprofloxacin (C), a fluoroquinolone antibiotic. Ciprofloxacin is effective against Shigella species, including strains resistant to other antibiotics, and is often recommended by the CDC for the treatment of shigellosis in adults and children. This is because ciprofloxacin can penetrate the intestinal mucosa, where Shigella resides, and exert its bactericidal effect.
**Why Each Wrong Option is Incorrect**
* **Option A:** Azithromycin is a macrolide antibiotic that may be used to treat some bacterial infections, but it is not the preferred treatment for shigellosis due to variable efficacy and potential resistance.
* **Option B:** Metronidazole is an antibiotic effective against anaerobic bacteria and protozoa, but it is not used to treat Shigella infections.
* **Option D:** Amoxicillin is a broad-spectrum penicillin antibiotic that may be used to treat various bacterial infections, but it is not the preferred treatment for shigellosis due to potential resistance and variable efficacy.
**Clinical Pearl / High-Yield Fact**
Always consider the local resistance patterns when selecting an antibiotic for treating shigellosis, as resistance to ciprofloxacin and other antibiotics can vary geographically.
**Correct Answer: C. Ciprofloxacin**