Patient: Dear Ask The Doctor: Hello Dear Doctor, I am so sorry, I ment HDCV rabies vaccine (human Cell) and not the Chicken based – I need to receive rabies pre-exposure booster AND not post-exposure in the USA. I have heard of some possibility of allergic reactions with boosters up to 6 percent. However, what is my biggest concern is possibility of anaphylaxis after rabies booster, and I am so afraid now. I have to mention that I have not been allergic to any rabies vaccination ever so far, or any other vaccination and to nothing at all during my whole life.What are my chances, I learned that 1 in 10,000 of immediate anaphilaxis actually referes to primary vaccination, I believe? As stated in: I trust this will receive your consideration and I look forward to hearing from you as soon as possible. Respectfully yours, Andrew.