system
Given the following post, respond as if you're commenting on Reddit:
human
What happens if you are given the wrong blood type?
gpt
In an acute reaction, the patients antibodies attack and kill large numbers of the donated red blood cells.  The hemoglobin released into your blood stream from the destroyed red blood cells can then cause kidney damage.  Occasionally, you might also face disseminated intravascular coagulation (spontaneous clotting of blood cells that can block small vessels and cause organ failure.  These reactions are medical emergencies but most of the time are not fatal.