Final answer:
Rabies post-exposure prophylaxis includes intramuscular and intradermal injections of human rabies immune globulin and a series of rabies-specific vaccinations, which was the treatment received by David over 14 days to ensure his recovery from a potential rabies infection.
Step-by-step explanation:
Routine post-exposure vaccination for rabies involves both intramuscular and intradermal injections. Specifically, after potential exposure to rabies, individuals receive human rabies immune globulin near the site of the bite for immediate passive immunity. Following this, multiple doses of a rabies vaccine are administered intramuscularly to develop active immunity. This strategy provides effective protection against the virus by enabling the immune system to mount a strong response in time to prevent the virus from reaching the central nervous system. In the case described, David's treatment included an injection of rabies immunoglobulin and a series of four rabies-specific vaccinations in the arm over a 14-day period, which helped him recover from a potential rabies infection.