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This glossary is provided for a better understanding of HIV/AIDS terminology in current usage. Medical and scientific terminology are based on the Surgeon General's Report of AIDS, publications of the Centers for Disease Control and Prevention, the former Global AIDS Programme of the World Health Organization (now part of U.N.AIDS), AIDS Treatment Data Network, and Harvard's Global Policy on AIDS Coalition. The research literature was also consulted through the internet. This glossary is up to date; some terms in this field have changed (e.g. ARC; GRID) and are no longer used. For purposes of discussion in this report, the term AIDS is commonly used to include HIV infection and disease and AIDS-related opportunistic infections and related-diseases. HIV/AIDS is also used.