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FAQ502, June 2018

What is human immunodeficiency virus? Human immunodeficiency virus (HIV) is the virus that causes acquired immunodeficiency syndrome (AIDS). Once HIV is in your body, it attacks the immune system. As the immune system weakens, it is less able to resist disease and infections. AIDS is diagnosed when a person with HIV develops diseases that the immune system normally would fight off, such as pneumonia, certain types of cancer, and harmful infections.


FAQ027, February 2018

What is the Rh factor? The Rh factor is a protein that can be found on the surface of red blood cells. If your blood cells have this protein, you are Rh positive. If your blood cells do not have this protein, you are Rh negative.


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