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It's not just blood shortage in total numbers (which is a problem), but people who receive transfusions often develop additional antibodies, which makes it even harder for them to receive compatible blood in the future. There are actually millions of "varieties" of blood not just the 8 main types. It can be so hard to find a successful match that blood is sometimes shipped internationally. Emergency situations can be particularly difficult.

https://www.smithsonianmag.com/science-nature/your-blood-typ...




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