# The Specified Animal Pathogens Order 2008, Paragraph 4

Extent: E+W

Avian influenza viruses that are —
(a) uncharacterised;
(b) Type A viruses which have an intravenous pathogenicity index in six-week-old chickens of greater than 1.2; or
(c) Type A viruses H5 or H7 subtype for which nucleotide sequencing has demonstrated multiple basic amino acids at the cleavage site of hæmagglutinin

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Source: https://www.legislation.gov.uk/uksi/2008/944/schedule/1/paragraph/4 (the official version)
Page: https://openlegislation.uk/specified-animal-pathogens-order-2008/schedule-1/paragraph-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.