By eHow Parenting Editor
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Red blood cells contain markers that the immune system recognizes. One of those markets is the Rh factor. Any person with Rh is his blood is Rh positive (as in the blood type B+). If a person does not have Rh in her blood, she is Rh negative (as in blood type A-). Women who are Rh negative, but have Rh positive partners, must take Rh immune globulin (brand name RhoGAM) during and after birth.
eHow Parenting Editor