/u/ciufolo's posts in /r/askscience

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Why does our immune system need one or two injections to learn to fight a new threat and many injections to unlearn to fight a perceived threat (e.g. dust mite)? Thanks

3298 upvotes

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Has there ever been an adult that has changed his/her blood group or rh blood group over his/her lifetime?

7 upvotes

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
Why does our immune system need one or two injections to learn to fight a new threat and many injections to unlearn to fight a perceived threat (e.g. dust mite)? Thanks	3298
Has there ever been an adult that has changed his/her blood group or rh blood group over his/her lifetime?	7