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It's O _negative_ that's the Universal Donor. Give O pos to someone who's A negative, and they're in for trouble.
Note that it is only O- (0 RH Negative) blood that can be given to anyone. O+ can be given to any other positive blood type recipient.
See: http://en.wikipedia.org/wiki/Blood_type#Red_blood_cell_compatibility
Duh... O here...haha They're always wanting to stick me at the hospital... Take a number! o_O
Its not O IT is negative -O
the red blood cells looks like cheerios and fruit loops!