Rabies PEP in pre-vaccinated individual — DTM&H MCQ

Correct answer: B — Two further rabies vaccine doses on days 0 and 3 only

The correct answer is B, two further rabies vaccine doses on days 0 and 3 only. She completed a full three-dose pre-exposure primary course, which UKHSA defines as three doses over 21 to 28 days or an accelerated three-dose course. Because pre-exposure immunisation primes an anamnestic (memory) immune response, UKHSA guidance on managing rabies post-exposure treatment classifies such individuals as fully immune, and their post-exposure management requires only two booster vaccine doses given on days 0 and 3, with no human rabies immunoglobulin (HRIG). The bite from a stray dog in West Africa still mandates a formal UKHSA risk assessment and prompt wound care, but the vaccine history changes the treatment category entirely compared to a naive contact. Why the other options are wrong: D. No action needed as she is fully vaccinated: prior immunisation reduces but does not eliminate risk after a new high-risk exposure such as a dog bite in an enzootic area; a booster course is still required to restimulate protective titres. E. Full post-exposure course including RIG: this four to five dose schedule with HRIG is reserved for previously unvaccinated or non-immune individuals; giving HRIG to an already primed person can blunt the anamnestic vaccine response and is not indicated. C. Single booster dose of rabies vaccine only: a single dose is insufficient to reliably boost antibody titres after exposure; the recognised regimen for previously immunised persons is two doses, not one. A. Rabies immunoglobulin alone: HRIG without vaccine provides only short-lived passive antibody and is never used as monotherapy, and is specifically avoided in previously vaccinated individuals. Key point: A documented complete pre-exposure rabies vaccine course means post-exposure treatment is reduced to two vaccine doses (days 0 and 3) with no HRIG, reflecting an already primed immune system.

Reference: UKHSA, Immunisation against infectious disease (the Green Book), Chapter 27: Rabies, updated May 2023, and UKHSA Guidelines on managing rabies post-exposure treatment, January 2023, gov.uk