preamble_231

Council Directive 80/217/EEC of 22 January 1980 introducing Community measures for the control of classical swine fever · European Union

The degree of neutralizing activity is expressed as the difference between the infectious titre in the presence of a 1/20 dilution of known negative serum and the titre of the same virus suspension in the presence of the suspect serum. This difference is the neutralization index and is expressed logarithmically.

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Source: EUR-Lex (Cellar) · retrieved 2026-11-09 · Text as adopted (Official Journal); later amendments are not incorporated in this text.