Heres a better analogy:
I got this V8 engine.
It was messing up and I figured it was the oil pump. So after replacing the pump, I accidentally replace the engine oil with olive oil. The engine is now worse than it was. I think "Oh shit! that was olive oil", flush it out, and replace it with engine oil again.
The engine dies completely...
Now are you going to want the heads or carb off my engine that was running on olive oil and quickly died because of residuals and trauma related to that?
Who knows how extensive the damage was?
Who wants to find out?
With engine parts you can probably do a lot better job at "flushing out" the bad stuff. But when talking about organs and stuff... cells get damaged and can mutate.
Transplanting organs is already tricky enough as it is dealing with all the viruses and bacteria that want to over burden the immune system and reject the new part... let alone having to worry about traces/after effects of the wrong blood type within the cells.
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