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In page Antibody:

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Detection of particular antibodies is a very common form of medical diagnostics, and applications such as serology depend on these methods.[1] For example, in biochemical assays for disease diagnosis,[2] a titer of antibodies directed against Epstein-Barr virus or Lyme disease is estimated from the blood. If those antibodies are not present, either the person is not infected or the infection occurred a very long time ago, and the B cells generating these specific antibodies have naturally decayed.[citation needed]