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.
A human immunodeficiency virus (HIV) test detects antibodies to HIV or the genetic material (DNA or RNA) of HIV in the blood or another type of sample. This determines whether an HIV infection is present (HIV-positive).hese tests include: 1  Enzyme-linked immunosorbent assay (ELISA) . 2  This test is usually the first one used to detect infection with HIV. 3  If antibodies to HIV are present (positive), the test is usually repeated to confirm the diagnosis. 4  If ELISA is negative, other tests are not usually needed.