DOC for prophylaxis against Diphtheria is:-
**Core Concept**
The question requires knowledge of diphtheria prophylaxis, specifically the drug of choice (DOC) for preventing this bacterial infection. Diphtheria is caused by Corynebacterium diphtheriae, a Gram-positive bacterium. The prophylaxis involves administering a medication that can prevent the colonization and subsequent infection of the bacteria.
**Why the Correct Answer is Right**
The DOC for prophylaxis against diphtheria is erythromycin, a macrolide antibiotic. Erythromycin works by inhibiting protein synthesis in bacteria, thereby preventing the growth and multiplication of Corynebacterium diphtheriae. This is particularly important in individuals who are at high risk of exposure, such as healthcare workers or those traveling to areas with high diphtheria prevalence.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it does not specify a medication. Various medications can be used for different purposes, and without further context, it is unclear what this option refers to.
**Option B:** This option is incorrect as it is not a commonly used medication for diphtheria prophylaxis. While some medications may have antibacterial properties, they may not be effective against Corynebacterium diphtheriae.
**Option C:** This option is incorrect as it is not a medication used for diphtheria prophylaxis. Some medications may have immunosuppressive effects and could potentially worsen the infection.
**Clinical Pearl / High-Yield Fact**
Remember that erythromycin is the DOC for prophylaxis against diphtheria, particularly in high-risk individuals. It is essential to administer the medication promptly to prevent colonization and subsequent infection.
**Correct Answer:** C. Erythromycin.