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HIV stands for Human Immunodeficiency Virus (say: ih-myoo-nuh-dih-fih-shun-see). AIDS stands for Acquired Immunodeficiency Syndrome. HIV is actually the virus that causes the disease AIDS. To understand AIDS formation process, we need to know what an Immune System is (say: ih-myoon). Every person has body protective system.
HIV is the virus that causes AIDS. It is spread mainly through blood and sexual contact. You can have HIV and feel healthy. Over many years, however, the virus can wear down your body's immune system, making it hard for your body to fight off dangerous infections. Having HIV also can increase your risk of getting certain cancers.