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A donor gives blood at a National Blood Service centre in London, March 16, 2004. A public inquiry starts on Wednesday into the deaths of hundreds of patients infected by contaminated blood in what has been called the NHS's "worst treatment disaster". REUTERS/Toby Melville

School children during preparation for World AIDS Day in the northern Indian city of Chandigarh, November 29, 2006. Hundreds of thousands of children are dying of AIDS in developing countries because they do not have access to treatment readily available elsewhere, U.N. health agencies said on Tuesday. REUTERS/Ajay Verma