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.
Because antibodies testing can only detect HIV 3 weeks after exposure, doctors can sometimes conduct an RNA test. This type of test looks for the presence of the virus in the blood instead of the antibodies. It can detect HIV as soon as it enters the bloodstream, which usually tales around 10 days.