a desert in NW India and S Pakistan. About 77,000 sq. mi. (200,000 sq. km). Also called Great Indian Desert.
HIV tests are used to detect the presence of the human immunodeficiency virus (HIV), the virus that causes acquired immunodeficiency syndrome (AIDS), in serum, saliva, or urine. Such tests may detect antibodies, antigens, or RNA.
ROCKVILLE, MARYLAND--On August 6, 1996, the Food and Drug Administration approved the first HIV test that uses urine samples. All previously approved HIV tests use either blood or oral fluid samples. The new urine-based test detects the presence of antibodies to HIV-1, the virus that causes the vast majority of U.S. AIDS cases, using an enzyme linked immunosorbent assay (ELISA) method.