# Commission Delegated Regulation (EU) 2020/689 of 17 December 2019 supplementing Regulation (EU) 2016/429 of the European Parliament and of the Council as regards rules for surveillance, eradication programmes, and disease-free status for certain listed and emerging diseases (Text with EEA relevance), Division 3: If no circulation of the infection has been detected for 2 consecutive years following granting of the status free from infection with BTV of a Member State or of a zone, surveillance must be based on:

Extent: E+W+S+N.I.

(a) random annual surveillance at least to detect, with a 95 % level of confidence, the infection with BTV at a target prevalence rate of 20 %; or
(b) risk-based annual surveillance to detect infection with BTV carried out taking into account the systems of production and the risk factors identified.

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Source: https://www.legislation.gov.uk/eur/2020/689/annex/V/chapter/4/section/2/division/3 (the official version)
Page: https://openlegislation.uk/eu-regulation-2020-689/annex-V/chapter-4/section-2/division-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.