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What is the rarest blood type?

In general, the rarest blood type is AB negative and the most common is O positive. According to the breakdown of the rarest and most common blood types by ethnicity: American Red Cross..

O positive:

  • African American: 47%
  • Asian: 39%
  • Caucasian: 37%
  • Latin American: 53%

What is the rarest blood type?

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