**Core Concept**
Prophylactic immunization against rabies is a critical measure after an animal bite, especially from a high-risk species like a dog. The decision to administer post-exposure prophylaxis (PEP) involves assessing the animal's vaccination status, the severity of the bite, and the individual's risk factors.

**Why the Correct Answer is Right**
The World Health Organization (WHO) and the Centers for Disease Control and Prevention (CDC) recommend a 28-day PEP regimen for individuals bitten by a dog suspected of being infected with rabies. This regimen typically consists of immediate wound cleaning, administration of rabies immunoglobulin (RIG), and a series of 2-3 doses of the rabies vaccine on days 0, 7, and 21 or 28. The post-exposure rabies vaccination induces a rapid immune response, providing effective protection against the virus.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it does not specify the correct duration of post-exposure prophylaxis. The 28-day regimen is crucial for ensuring adequate immunity against rabies.
**Option B:** This option is incorrect as it does not mention the administration of rabies immunoglobulin (RIG), which is a critical component of post-exposure prophylaxis.
**Option C:** This option is incorrect as it does not specify the need for immediate wound cleaning, which is essential for preventing the transmission of rabies virus through the bite wound.

**Clinical Pearl / High-Yield Fact**
In areas where rabies is endemic, it is essential to maintain a high index of suspicion for post-exposure prophylaxis, particularly in individuals bitten by dogs or other high-risk animals. Prompt initiation of PEP significantly reduces the risk of rabies transmission.

**Correct Answer: D. 28-day post-exposure prophylaxis regimen consisting of wound cleaning, rabies immunoglobulin, and 2-3 doses of the rabies vaccine.**