Question
Name the non-neural vaccines for preventing rabies and pre-exposure prophylaxis
Answer
Non-neural (modern cell-culture-derived) rabies vaccines: Human Diploid Cell Vaccine (HDCV) — grown in human diploid cell culture; Purified Chick Embryo Cell vaccine (PCECV) — grown in chick embryo fibroblast culture; Purified Vero Cell Rabies Vaccine (PVRV) — grown in Vero cell line; Purified Duck Embryo Vaccine (PDEV) — grown in duck embryo, less commonly used now.
Advantage over older neural-tissue vaccines (e.g., Semple vaccine): markedly improved safety (no risk of neuroparalytic reaction from contaminating host neural tissue/myelin), higher immunogenicity, and more convenient dosing schedules.
Pre-exposure prophylaxis (PrEP): recommended for high-risk occupational groups — veterinarians, animal handlers, wildlife workers, and laboratory personnel working with the virus. Given as a shortened vaccine schedule (e.g., 2–3 doses over a defined period, without Rabies Immunoglobulin, since the goal is priming rather than immediate full protection); administered before any known exposure occurs. If a vaccinated individual is subsequently bitten/exposed, they still require prompt booster doses (without RIG, since pre-existing immune priming allows a faster, adequate secondary response), simplifying post-exposure management compared to a completely unvaccinated individual.