# 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: For the purposes of this case definition, the disease agent responsible for HPAI must be either

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

(a) an influenza A virus of H5 and H7 subtypes or any influenza A virus with an intravenous pathogenicity index (IVPI) greater than 1,2; or
(b) an influenza A virus of H5 and H7 subtypes with a sequence of multiple basic amino acids present at the cleavage site of the haemagglutinin molecule (HA0) that is similar to that observed for other HPAI isolates.

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Source: https://www.legislation.gov.uk/eur/2020/689/annex/I/section/1/division/3 (the official version)
Page: https://openlegislation.uk/eu-regulation-2020-689/annex-I/section-1/division-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.