The type of rare blood type was AB with a CMV negative. CMV stands for cytomegalovirus, a generally harmless virus. Most people contract CMV sometime during of their lifetime. AB with CMV negative blood is used for transfusions for people with weakened immune systems such as babies, burn victims, and people having organ transplants. A blood donor who is CMV negative is someone that has never been exposed to the cytomegalovirus and as such is highly valuable for such people.

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