FILE - This combination made from file photos provided by the National Institute of Health, Pasteur Institute shows, at top, a form of human T-cell leukemia virus, or HTLV, discovered by U.S. Dr. Robert Gallo and his team at the National Cancer Institute, a division of the National Institute of Health in Bethesda, Md. The image at bottom shows a lymphadenopathy-associated virus, or LAV, discovered by French Dr. Luc Montagnier of the Pasteur Institute. Both Gallo and Montagnier are credited with isolating the HIV virus that causes AIDS, or the human immunodeficiency virus. The discovery was announced 30 years ago, on April 23, 1984, at a news conference in Washington. (AP Photo/National Institute of Health, Pasteur Institute, File)
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