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AIDS is a disease that attacks the immune system, the part of the body that fights infection. AIDS is deadly and global. Over 11 million children have lost parents to AIDS. From 1981 to 2007, more than 25 million people died of AIDS. That is more than all the people in Tokyo, London, and New York. Today between 30 and 36 million people are living with AIDS, more than the population of Canada.

HIV is the virus that causes AIDS. If a person has HIV, they are "HIV positiv...