preamble_228

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

The results are expressed as the plaque reduction titre, which is the reciprocal of the serum dilution which reduces the number of fluorescent foci by 90 % as compared with the 1/20 diluted negative control serum. The titres are determined graphically.

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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.