Can an anaphylactic reaction occur hours/days after exposure or does it happen right after?

How long does it take? Also how big is a possibility of a person with generally no allergies to get one?

2 Answers

  • 3 weeks ago

    Its nearly always a very rapid reaction; however, there is uncommon type of reaction called a delayed hypersensitivity reaction that can occur days later  with progressively worsening symptoms that can lead to analphylaxis.

    If a person has no allergies, the odds of anaphylaxis are zero since its only caused by an allergic reaction.     

  • Byrd
    Lv 7
    3 weeks ago

    Anaphylaxis happens in 20 minutes if you are at minute 21 it isn't going to happen

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