**Core Concept**
Diphtheria is a contagious bacterial infection caused by Corynebacterium diphtheriae, characterized by the formation of a toxin that leads to local tissue damage and systemic complications. Management of non-immunized diphtheria contacts involves chemoprophylaxis and isolation to prevent spread.

**Why the Correct Answer is Right**
Chemoprophylaxis with erythromycin or penicillin is recommended for non-immunized contacts of diphtheria patients to eliminate the carrier state and prevent infection. This is particularly crucial in individuals who are not immune due to lack of vaccination or previous infection. The goal is to prevent the spread of the bacteria through respiratory droplets.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not provided.
**Option B:** This option is not provided.
**Option C:** This option is not provided.
**Option D:** This option is not provided.

**Clinical Pearl / High-Yield Fact**
It is essential to identify and manage non-immunized diphtheria contacts promptly, as they pose a significant risk of transmitting the infection to others. Chemoprophylaxis is a critical component of outbreak control.

**Correct Answer:**
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