What is the recommended drug for treatment of carriers of diphtheria?
**Core Concept**
Diphtheria is a bacterial infection caused by Corynebacterium diphtheriae. Carriers are individuals who harbor the bacteria in their throat without displaying symptoms but can transmit the infection to others. The recommended treatment for carriers is to eliminate the bacteria from their throat.
**Why the Correct Answer is Right**
The recommended drug for treating carriers of diphtheria is erythromycin. Erythromycin is a macrolide antibiotic that inhibits protein synthesis by binding to the 50S ribosomal subunit of bacteria, thereby preventing the production of essential proteins. This action is bacteriostatic, meaning it stops the growth and multiplication of the bacteria, allowing the body's immune system to eliminate them. Erythromycin is effective against Corynebacterium diphtheriae and is the preferred treatment for carriers to prevent transmission of the infection.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is not a recommended treatment for carriers of diphtheria. Other antibiotics, such as penicillin, may be used to treat diphtheria itself, but erythromycin is specifically recommended for carriers.
**Option B:** This option is incorrect because it is not a commonly used antibiotic for treating carriers of diphtheria. Other antibiotics, such as sulfonamides, may be used in certain situations, but erythromycin is the preferred treatment for carriers.
**Option C:** This option is incorrect because it is not a recommended treatment for carriers of diphtheria. Other treatments, such as antitoxins, may be used to neutralize the diphtheria toxin, but erythromycin is specifically recommended for carriers.
**Option D:** This option is incorrect because it is not a commonly used antibiotic for treating carriers of diphtheria. Other antibiotics, such as aminoglycosides, may be used in certain situations, but erythromycin is the preferred treatment for carriers.
**Clinical Pearl / High-Yield Fact**
Carriers of diphtheria can be treated with erythromycin to prevent transmission of the infection. It is essential to identify and treat carriers promptly to prevent outbreaks of diphtheria.
**Correct Answer:** A. Erythromycin.