A, B, O, AB: There are 4 types of human blood - a, b, o, ab. There is also a rhesus (rh) designation: + or -. O- is generally the universal donor and ab+ is generally the universal recipient.
Answered 10/27/2018
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Depends: The major blood types are A, B, AB, and O; Rh positive or negative with each type. However there more than a dozen other blood group systems with each having multiple sub-types. With rare exceptions blood types are not cause of any disease. You may visit this site for technical details: http://www.isbtweb.org/fileadmin/user_upload/files-2015/red%20cells/general%20intro%20WP/Table%20blood%20group%
Answered 10/30/2018
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