The schedule of HDCV in rabies is:
**Core Concept**
Rabies post-exposure prophylaxis (PEP) involves the administration of human diploid cell vaccine (HDCV) to prevent the development of clinical rabies. The schedule of HDCV administration is critical to ensure effective neutralization of the virus.
**Why the Correct Answer is Right**
The HDCV schedule typically consists of a series of injections administered on days 0, 3, 7, 14, and 28. This schedule is designed to provide a robust immune response against the rabies virus, which is essential for preventing the disease. The administration of HDCV on day 0 and subsequent doses stimulates the production of rabies-specific antibodies, which help to neutralize the virus and prevent its spread to the central nervous system.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the HDCV schedule typically does not involve administration on days 0, 10, 20, and 30. These dates do not align with the standard PEP schedule.
**Option B:** This option is incorrect because the HDCV schedule typically does not involve administration on days 0, 14, 28, and 42. The inclusion of day 42 is not part of the standard PEP schedule.
**Option C:** This option is incorrect because the HDCV schedule typically does not involve administration on days 0, 5, 10, and 15. The administration of HDCV on day 5 is not part of the standard PEP schedule.
**Clinical Pearl / High-Yield Fact**
It is essential to administer HDCV on the day of the animal bite or exposure (day 0) to prevent the development of clinical rabies. Delaying treatment can lead to a higher risk of rabies transmission and a lower chance of successful neutralization of the virus.
**Correct Answer:** C.