system
Given the following post, respond as if you're commenting on Reddit:
human
If a body rejects an organ transplant, can that organ be used for someone else, or is it no longer usable?

If my body rejects a kidney, can it be used for the next applicable person on this list, or is it toast?
gpt
It's no longer usable. Rejection implies your immune system attacking and trying to kill it. Not only does that damage the organ, but it fills it with your immune cells. Moving it to another person not only exposes them to the foreign cells from the organ, but also any lingering cells from your body, making it more likely to trigger their immune system and cause another rejection.