A person who has type O blood has

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A person with type O blood has no A or B surface antigens on their red blood cells, but they do have both anti-A and -B antibodies in their plasma. This means that if they were to receive a blood transfusion with A, B, or AB blood, their antibodies would recognize the foreign antigens and attack the donated blood cells, causing a potentially fatal reaction. Therefore, people with type O blood are often called "universal donors" because their blood can be donated to people with any blood type, but they can only receive transfusions from other type O donors.

A Person Who Has Type O Blood Has