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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]