# 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 4: The status free from infection with WSSV may only be maintained as long as all samples, using the diagnostic methods set out in point 2 of Section 5 have produced negative results for WSSV and any suspicion of infection with WSSV has been ruled out in accordance with the diagnostic methods set out in point 3 of Section 5.

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

Table 6. B
Scheme for Member States, zones or compartments to maintain status free from infection WSSV
Risk level assigned to the establishment by the competent authority as set out in paragraph 1 of Chapter 2 of Part I other than in the case of dependent compartments where all establishments are deemed to be high risk.
Risk level
Number of health visits to each establishment/group of establishments
Number of laboratory examinations
Number of crustaceans in the sample
High
1 every year
1 every 2 years
150
Medium
1 every 2 years
1 every 2 years
150
Low
1 every 2 years
1 every 4 years
150

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Source: https://www.legislation.gov.uk/eur/2020/689/annex/VI/chapter/6/section/4/division/4 (the official version)
Page: https://openlegislation.uk/eu-regulation-2020-689/annex-VI/chapter-6/section-4/division-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.