That is an interesting point but I think it is incorrect. Anaphylaxis requires tiny amounts of an allergen to occur - if the allergen were already present in the room one would expect it to occur anyway. Even the scent of an allergen can contain enough of a dose to trigger it. Also having a window open would not necessarily be enough to prevent it happening for the same reason.
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Thanks for your view. In science, there is a level of unpredictability and unknown factors that we must always provide for. We talk about what we know. There are yet so much we do not know which is why science is a living subject. More so, why we keep discovering new things on top of what is previously discovered. Thank you.
Absolutely.