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.
The time at which antibodies to HIV appear is called seroconversion. Before this time, an HIV antibody test will give a negative result. During suspected primary HIV infection, other forms of test can be used to detect the presence of the virus (or antigen).Such tests respond to a specific protein on the HIV virus, although as HIV becomes fully established in the body the protein will fade to undetectable levels and the test will be inaccurate.he time at which antibodies to HIV appear is called seroconversion. Before this time, an HIV antibody test will give a negative result. During suspected primary HIV infection, other forms of test can be used to detect the presence of the virus (or antigen).