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The precision and comparative sensitivity of interferon assays.

Any interferon assay essentially measures the potency of unknown samples relative to each other or to a standard. The reliability of such measurements of relative potency, i.e. the precision of the assay, is a key feature of any method. In contrast, sensitivity is seldom a characteristic of great importance in an assay. Nevertheless, relatively high sensitivity can often be achieved quite readily by a suitable choice of cells and challenge virus.